Comtech EF Data SDM-300L3 Installation And Operation Manual
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Comtech EF Data SDM-300L3 Installation And Operation Manual

Satellite modem
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SDM-300L3
Satellite Modem

Installation and Operation Manual

IMPORTANT NOTE: The information contained in this document supersedes all previously
published information regarding this product. Product specifications are subject to change
without prior notice.
Part Number MN/SDM300L3.IOM
Revision 1

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  • Page 1: Installation And Operation Manual

    SDM-300L3 Satellite Modem Installation and Operation Manual IMPORTANT NOTE: The information contained in this document supersedes all previously published information regarding this product. Product specifications are subject to change without prior notice. Part Number MN/SDM300L3.IOM Revision 1...
  • Page 3 Comtech EF Data is an ISO 9001 Part Number MN/SDM300L3.IOM Registered Company. Revision 1 July 25, 2004 Copyright © Comtech EF Data, 2000. All rights reserved. Printed in the USA. Comtech EF Data, 2114 West 7th Street, Tempe, Arizona 85281 USA, 480.333.2200, FAX: 480.333.2161.

  • Page 4: Customer Support

    4. To ensure that the product is not damaged during shipping, pack the product in its original shipping carton/packaging. 5. Ship the product back to Comtech EF Data. (Shipping charges should be prepaid.) For more information regarding the warranty policies, see, p. xviii.

  • Page 5: Table Of Contents

    Table of Contents CHAPTER 1. INTRODUCTION..................... 1–1 Overview........................1–3 Options Summary......................1–3 Comtech EF Data Part Numbers ................1–4 FAST Accessible Options................... 1–5 Compatibility........................ 1–6 Description of the Modulator..................1–6 1.6.1 Overview..........................1–6 1.6.2 Description..........................1–6 1.6.3 Description of Modulation Types ...................1–7 1.6.4...
  • Page 6 SDM-300L3 Satellite Modem Revision 1 Preface MN/SDM300L3.IOM CHAPTER 2. INSTALLATION/ UPGRADES ............... 2–1 Unpacking ........................2–1 Installation........................2–2 Software and Hardware Installation/Upgrades ............2–4 2.3.1 Overhead Interface PCB Installation ..................2–4 2.3.2 Reed-Solomon PCB ......................2–6 2.3.3 Turbo Codec Installation......................2–8 Data I/O Interface Connector (J8) Removal/Installation......... 2–11 Hardware Upgrades....................
  • Page 7 309 IBS Operation .........................5–3 5.3.2 VSAT IBS Operation......................5–3 D&I Operation ......................5–4 ASYNC/AUPC Operation..................... 5–5 Closed Network Operation (Comtech EF Data) ............5–6 Custom Operation ....................... 5–8 Reed-Solomon Modes....................5–9 CHAPTER 6. CLOCKING AND RX BUFFERING SETTINGS ..........6–1 Clocking Options......................6–1 6.1.1...
  • Page 8 SDM-300L3 Satellite Modem Revision 1 Preface MN/SDM300L3.IOM Frame/Multiframe Length..................6–17 6.7.1 Multiples of the Frame Length .....................6–17 6.7.2 Total Buffer Length ......................6–17 6.7.3 Converting Between Bits and Seconds ................6–17 CHAPTER 7. FEC AND TURBO ..................7–1 Introduction........................7–1 Coding .......................... 7–2 Turbo Product Codec (Hardware Option) ..............
  • Page 9 SDM-300L3 Satellite Modem Revision 1 Preface MN/SDM300L3.IOM CHAPTER 11. ASYNCHRONOUS INTERFACE/AUPC ............11–1 11.1 Asynchronous Interface/AUPC ................11–1 11.2 AUPC .......................... 11–4 11.2.1 AUPC – Between Two Modems ..................11–5 11.2.2 Self-Monitoring Local Modem AUPC Control ..............11–6 11.3 ASYNC ........................11–7 11.3.1...
  • Page 10 SDM-300L3 Satellite Modem Revision 1 Preface MN/SDM300L3.IOM 14.5 L-Band Modulator Specifications ................14–6 14.5.1 Digital Data Rate .........................14–6 14.5.2 Modulation and Encoding Types ..................14–8 14.5.3 Scrambling Types........................14–9 14.5.4 Modulator Frequency Reference..................14–9 14.5.5 Modulator Spurious Emissions ..................14–10 14.5.6 Modulator Phase Noise .....................14–10 14.5.7...
  • Page 11 SDM-300L3 Satellite Modem Revision 1 Preface MN/SDM300L3.IOM 14.8 Bit Error Rate Performance ..................14–22 14.8.1 Performance With Noise, Viterbi Decoder, and Closed Network ........14–22 14.8.2 Performance With Noise, Viterbi Decoder, and Reed-Solomon (Optional) ......14–22 14.8.3 Performance With BPSK and {O}QPSK BER Performance..........14–22 14.8.4...
  • Page 12 SDM-300L3 Satellite Modem Revision 1 Preface MN/SDM300L3.IOM 14.14 IBS (Optional with Overhead Card)................ 14–36 14.14.1 IBS Primary Data Interfaces ..................14–36 14.14.2 IBS Clock and Dejitter ....................14–36 14.14.3 IBS Framing........................14–36 14.14.4 IBS Engineering Service Channel .................14–37 14.14.5 IBS Scrambling ......................14–37 14.15 Drop and Insert (Optional with Overhead Card) ........... 14–37 14.14.1...
  • Page 13 Figure 2-5. Data I/O Connector (J8) Removal/Installation ..............2–13 Figure 2-6. Overhead Board with Field-Changeable Chips ..............2–15 Figure 2-7. Main Board Field-Changeable Chips (Shown with Overhead Card Removed)....2–15 Figure 3-1. SDM-300L3 Rear Panel......................3–2 Figure 4-1. Front Panel View........................4–1 Figure 4-2. Keypad ...........................4–3 Figure 4-3.
  • Page 14 SDM-300L3 Satellite Modem Revision 1 Preface MN/SDM300L3.IOM Tables Table 1-1. FAST Options and Required Configurations................1–5 Table 2-1. Connector (J8) Matrix......................2–11 Table 3-1. Modem Rear Panel Connectors....................3–2 Table 3-2. Remote Connector and Pinouts (J6)..................3–3 Table 3-3. Fault Connector and Pinouts (J7) ...................3–4 Table 3-4.

  • Page 15: About This Manual

    About this Manual This manual provides installation and operation information for the Comtech EF Data SDM-300L3 satellite modem. This is a technical document intended for earth station engineers, technicians, and operators responsible for the operation and maintenance of the SDM-300L3.
  • Page 16 Recommended Standard (RS) Designations are equivalent toElectronic Industries Association (EIA) designations. Reference to either designation is permissible, however, Comtech EF Data has determined to use only one designator thru-out the manual. Trademarks Windows is a trademark of the Microsoft Corporation.

  • Page 17: Electrical Safety

    150W, 48V BUC power supply at maximum load. USES The SDM-300L3 Satellite Modem is fitted with two fuses, one each for line and neutral connections. These are contained within the body of the IEC power connector, behind a small plastic flap.
  • Page 18 The equipment is not designed for connection to power system that has no direct connection to ground. The SDM-300L3 is shipped with a line inlet cable suitable for use in the country of operation. If it is necessary to replace this cable, ensure the replacement has an equivalent specification.
  • Page 19 (Also tested to FCC Part 15 Class B) Immunity: EN 50082 Part 1 - Generic immunity standard, Part 1: Domestic, commercial and light industrial environment. Additionally, the SDM-300L3 has been shown to comply with the following standards: EN 61000-3-2 Harmonic Currents Emission EN 61000-3-3...

  • Page 20: Limitations Of Warranty

    Disclaimer Comtech EF Data has reviewed this manual thoroughly in order that it will be an easy-to- use guide to your equipment. All statements, technical information, and recommendations in this manual and in any guides or related documents are believed...

  • Page 21: Chapter 1. Introduction

    Chapter 1. INTRODUCTION The SDM-300L3 Satellite Modem is designed to meet the requirements of the Satellite Digital Communications industry. The modem is a high performance, full duplex modem compliant with IESS-308/309/310/315, FDC, and V.35 specifications, but also adds significant other features in Closed Network modes. It offers variable data rates from 2.4 kbps to 5.0 Mbps, in BPSK, QPSK, Offset QPSK, and 8-PSK.

  • Page 22: Figure 1-1. Block Diagram

    2. When the modem is equipped with a 50-pin data I/O connector, the use of the BOP is required to interface the customer data connector to the modem. 3. Contact Comtech EF Data for information concerning universal breakout panels. 1–2...

  • Page 23: Overview

    Built-In Test • BPSK, QPSK, OQPSK, and 8-PSK • BUC FSK Communications Options Summary A summary of the available options for the unit is provided. Contact Comtech EF Data Customer Support for upgrade information. Install Option Description & Comments Availability...

  • Page 24: Comtech Ef Data Part Numbers

    Factory BUC) ODU DC Power: 24V or 48V. Primary 100W @ 24V Factory input = AC Only 150W @ 48V Comtech EF Data Part Numbers Part No. Description Remarks PL/9066-3 RX only IF 1.0 ppm Use with internal reference LNBs.

  • Page 25: Fast Accessible Options

    MN/SDM300L3.IOM FAST Accessible Options Comtech EF Data FAST system allows immediate implementation of different options through the user interface keypad. Some FAST options are available through the basic platform unit, while others require that the unit be equipped with optional hardware or that the hardware be installed in the field.

  • Page 26: Compatibility

    SDM-300L3 Satellite Modem Revision 1 Introduction MN/SDM300L3.IOM Compatibility The SDM-300L3 is functionally compatible with many Comtech EF Data modems. When properly configured, the unit will interoperate with the following Comtech EF Data modems: • • CDM-550/550T SDM-650B • • CDM-600/600L...

  • Page 27: Description Of Modulation Types

    I and Q channels of the modulator. The baseband processing for the SDM-300L3 is the same as for the SDM-300L1 and SDM-300A modulator except that the digital modulation is not used. Instead, the baseband Nyquist filtered I and Q signals pass through D/A converters to drive an analog vector modulator.

  • Page 28: Bpsk Encoding

    SDM-300L3 Satellite Modem Revision 1 Introduction MN/SDM300L3.IOM • QPSK (OQPSK): 4 discrete phase angles represent the 4 possible states of a symbol. • 8-PSK: 8 discrete phase angles represent the 8 possible states of a symbol. Note: The code rate determines the number of symbols per bit.

  • Page 29: Oqpsk Encoding

    SDM-300L3 Satellite Modem Revision 1 Introduction MN/SDM300L3.IOM 1.6.6 OQPSK Encoding The modulator PCB converts the transmitted baseband data into a modulated OQPSK carrier within the same parameters as QPSK. The OQPSK modulation is mainly different from QPSK by offsetting the I and Q channel modulation signals.

  • Page 30: Description Of The Demodulator

    SDM-300L3 Satellite Modem Revision 1 Introduction MN/SDM300L3.IOM Description of the Demodulator A block diagram of the demodulator is shown in Figure 1-2. 1.7.1 Overview The demodulator converts PSK modulated carriers within the 950 to 1750 MHz range to a demodulated baseband data stream. The converted modulation types are BPSK, QPSK, OQPSK, and 8-PSK.

  • Page 31: Functional Description

    SDM-300L3 Satellite Modem Revision 1 Introduction MN/SDM300L3.IOM 1.7.2 Functional Description The demodulator functions as an advanced, digital, coherent-phase-lock receiver and decoder. Demodulator faults also are reported to the front panel. The demodulator consists of the following basic subsections. • Digital Costas Loop •...

  • Page 32: Description Of Monitor & Control

    SDM-300L3 Satellite Modem Revision 1 Introduction MN/SDM300L3.IOM implemented digitally. The DDS performs the function of a VCO in an analog implementation. The recovered data and symbol clocks are then used throughout the demodulator. The soft decision mapper converts the digital I and Q data to 3-bit soft decision values.

  • Page 33: Functional Description

    SDM-300L3 Satellite Modem Revision 1 Introduction MN/SDM300L3.IOM 1.8.2 Functional Description The M&C card is composed of the following subsections: • Microcontroller with Universal Asynchronous Receiver/Transmitter (UART) • Digital-to-Analog Converter (DAC) • Read Only Memory (ROM) • Analog-to-Digital Converter (ADC) •...
  • Page 34 SDM-300L3 Satellite Modem Revision 1 Introduction MN/SDM300L3.IOM The heart of the M&C card is the Dallas 80C310 microcontroller operating at 11 MHz. This microcontroller contains 256 Kbytes of internal RAM. The ROM at U8 is 29F040 (512 Kbytes). ROM access times must be equal to or greater than 150 ns. The RAM size can be 8 or 32 Kbytes.

  • Page 35: Dimensional Envelope

    SDM-300L3 Satellite Modem Revision 1 Introduction MN/SDM300L3.IOM Dimensional Envelope Refer to Figure 1-2 for the unit’s dimensional envelope drawing. Note: Dimensions are listed in inches and centimeters are in parentheses. Figure 1-4. Dimensional Envelope Drawing 1–15...
  • Page 36 SDM-300L3 Satellite Modem Revision 1 Introduction MN/SDM300L3.IOM This page is intentionally left blank. 1–16...

  • Page 37: Chapter 2. Installation/ Upgrades

    Chapter 2. INSTALLATION/ UPGRADES Unpacking The modem and manual are packaged in pre-formed, reusable, cardboard cartons containing foam spacing for maximum shipping protection. Do not use any cutting tool that will extend more than 1 inch into the container and cause damage to the modem. CAUTION Unpack the modem: 1.

  • Page 38: Installation

    SDM-300L3 Satellite Modem Revision 1 Installation/Upgrades MN/SDM300L3.IOM Installation The modem arrives fully assembled from the factory. After unpacking the modem, install the modem as follows: 2.2.1 Modem Installation (Optional) Refer to Figure 2-1. Use the following mounting kit KT/6228-1. KIT, KT/6228-1 (M...

  • Page 39: Figure 2-1. Installation Of The Optional Mounting Bracket Kt/6228-1

    SDM-300L3 Satellite Modem Revision 1 Installation/Upgrades MN/SDM300L3.IOM Equipment Rack Mounting Rail #10 Socket head screw BRACKET BOLTS Support Bracket * Note: Components of mounting kit KT/6228-1 Figure 2-1. Installation of the Optional Mounting Bracket KT/6228-1 2–3...

  • Page 40: Software And Hardware Installation/Upgrades

    SDM-300L3 Satellite Modem Revision 1 Installation/Upgrades MN/SDM300L3.IOM Software and Hardware Installation/Upgrades 2.3.1 Overhead Interface PCB Installation The overhead interface PCB can be installed at the factory or in the field. The overhead interface PCB is required to access certain options and functionality of the modem.

  • Page 41: Figure 2-2. Overhead Interface Pcb Installation

    SDM-300L3 Satellite Modem Revision 1 Installation/Upgrades MN/SDM300L3.IOM The mounting hardware must be installed to provide proper grounding between the overhead interface PCB and the main PCB. CAUTION 5. After completing the installation procedure turn on the modem. Select the desired modem option to use the overhead card.

  • Page 42: Reed-Solomon Pcb

    SDM-300L3 Satellite Modem Revision 1 Installation/Upgrades MN/SDM300L3.IOM 2.3.2 Reed-Solomon PCB The Simplex TX/RX Reed-Solomon and Duplex Reed-Solomon PCBs are installed in the same slots as the Turbo module. Do not mix the Simplex Reed-Solomon PCBs with Turbo PCB or the Duplex Reed-Solomon PCBs.

  • Page 43: Figure 2-3. Reed-Solomon Codec Installation

    SDM-300L3 Satellite Modem Revision 1 Installation/Upgrades MN/SDM300L3.IOM 4. After completing the above installation procedure turn on the modem. If the Reed-Solomon PCB was installed properly, the Utility: Modem Type: Card #2 Type or Card #3 Type. Menu will show “Reed-Solomon 02 or 03, or Reed- Solomon.

  • Page 44: Turbo Codec Installation

    SDM-300L3 Satellite Modem Revision 1 Installation/Upgrades MN/SDM300L3.IOM 2.3.3 Turbo Codec Installation The Turbo Card is installed in the same slots as the Reed-Solomon PCBs. While the Reed-Solomon uses two cards (TX and RX), the Turbo Codec uses only a single card.
  • Page 45 SDM-300L3 Satellite Modem Revision 1 Installation/Upgrades MN/SDM300L3.IOM 4. If required: Reed-Solomon Removal – Remove the Reed-Solomon boards from the SIMM sockets by pushing the spring clips outward while rocking the board vertically, then lift the board out. 5. Turbo Codec Installation - Align the Turbo board with either of the SIMM sockets while holding it vertically with components toward Rear panel.

  • Page 46: Figure 2-4. Turbo Codec Installation

    SDM-300L3 Satellite Modem Revision 1 Installation/Upgrades MN/SDM300L3.IOM Turbo Codec Installed (Either Slot) Figure 2-4. Turbo Codec Installation 2–10...

  • Page 47: Data I/O Interface Connector (J8) Removal/Installation

    SDM-300L3 Satellite Modem Revision 1 Installation/Upgrades MN/SDM300L3.IOM Data I/O Interface Connector (J8) Removal/Installation Note: The following procedures outline the removal and installation of the Data I/O connector (J8). These procedures are written with the assumption that the same configured connector will be reinstalled. However, the operator does have an option to install a different configured connector.
  • Page 48 SDM-300L3 Satellite Modem Revision 1 Installation/Upgrades MN/SDM300L3.IOM To install Data I/O Connector (J8), as follows: 1. (For Ribbon-Configured Connector PL/6031.) Install Data I/O connector (J8) (Figure 2-5) as follows: a. Position connector (J8) in rear panel. Use care when connecting the data I/O connector (J8) to the PCB.

  • Page 49: Figure 2-5. Data I/O Connector (J8) Removal/Installation

    SDM-300L3 Satellite Modem Revision 1 Installation/Upgrades MN/SDM300L3.IOM For Ribbon-Configured Connector For 50-Pin Connector with Overhead Interface Board Figure 2-5. Data I/O Connector (J8) Removal/Installation 2–13...

  • Page 50: Hardware Upgrades

    SDM-300L3 Satellite Modem Revision 1 Installation/Upgrades MN/SDM300L3.IOM Hardware Upgrades 2.5.1 Main PCB Firmware Chips The main PCB has one field-changeable flash memory chip for the M&C firmware. If necessary, this chip can be removed and a new chip added to allow for additional options, enhancements, or repairs.

  • Page 51: Figure 2-6. Overhead Board With Field-Changeable Chips

    SDM-300L3 Satellite Modem Revision 1 Installation/Upgrades MN/SDM300L3.IOM Figure 2-6. Overhead Board with Field-Changeable Chips Figure 2-7. Main Board Field-Changeable Chips (Shown with Overhead Card Removed) 2–15...

  • Page 52: Flash Upgrading

    Users shall re-enter the desired configuration parameters. IMPORTANT The SDM-300L3 provides for flash upgrading the M&C firmware or the BULK firmware. Note: While the M&C and BULK firmware downloads are independent processes, the modem may have to be upgraded to the latest releases of both the M&C and BULK for proper function.

  • Page 53: Downloading Flash Updates From The Web

    Data web site (http://www.comtechefdata.com). This utility is designed to run under Windows 95/98 or Windows NT/2000/XP and provides all of the support required to perform a Comtech EF Data firmware reflash. If web downloading is not available or practical, contact the Customer Support department to obtain the firmware via an alternate method.
  • Page 54 SDM-300L3 Satellite Modem Revision 1 Installation/Upgrades MN/SDM300L3.IOM This page is intentionally left blank. 2–18...

  • Page 55: Chapter 3. Connector Pinouts

    1. Refer to the Comtech EF Data UB-530 Universal Breakout Panel Installation and Operation Manual for connecting the UB-300 breakout panel. 2. Refer to the Comtech EF Data UB-54 Breakout Panel Installation and Operation Manual for connecting the UB-54 breakout panel in a MUX option configuration.

  • Page 56: Figure 3-1. Sdm-300L3 Rear Panel

    SDM-300L3 Satellite Modem Revision 1 Connector Pinouts MN/SDM300L3.IOM DATA I/O G.703/ASYNC INTERFACE OPTIONAL Figure 3-1. SDM-300L3 Rear Panel Table 3-1. Modem Rear Panel Connectors Ref. Desig. Name Connector Type Function TX/IF OUTPUT Type N , Female RF Output EXT REF...

  • Page 57: Connector Description

    SDM-300L3 Satellite Modem Revision 1 Connector Pinouts MN/SDM300L3.IOM Note: The European EMC Directive (EN55022, EN50082-1) requires using properly shielded cables for DATA I/O. These cables must be double-shielded from end-to-end, ensuring a continuous ground shield. Connector Description 3.2.1 Remote Connector and Pinouts (J6) The remote connector is a 9-pin subminiature female D connector (J6) located on the rear panel of the modem.

  • Page 58: Fault Connector And Pinouts (J7)

    SDM-300L3 Satellite Modem Revision 1 Connector Pinouts MN/SDM300L3.IOM 3.2.2 Fault Connector and Pinouts (J7) The fault connector provides Form C contact closures for fault reporting. The three Form C summary fault contacts, ratings 1A maximum at 24 VDC, 0.5A at 120 VAC, are Modulator, Demodulator, and Common Equipment.

  • Page 59: Data I/O Interface Connector (J8)

    SDM-300L3 Satellite Modem Revision 1 Connector Pinouts MN/SDM300L3.IOM 3.2.3 Data I/O Interface Connector (J8) The Data I/O interface connector conducts data input and output signals to and from the modem, and connects to the customer’s terrestrial equipment, breakout panel, or protection switch.

  • Page 60: Table 3-4. 25-Pin D Connector Pinouts

    SDM-300L3 Satellite Modem Revision 1 Connector Pinouts MN/SDM300L3.IOM Table 3-4. 25-Pin D Connector Pinouts 25-Pin D Connector Pin # EIA-422 EIA-232 V.35 SHLD SHLD SHLD SD-A SD-A RD-A RD-A RS-A CS-A DM-A SIGGND SIGGND SIGGND RR-A RLSD RT+B SCR+B RR-B...

  • Page 61: Table 3-5. 34-Pin Winchester Connector Pinouts (V.35)

    3. Grounding pin CC at the Fireberd interface will change the Fireberd  to a DCE device. 4. Comtech EF Data uses the CC and DD for the input master clock (same as the external clock input to the modem). To input an external clock, change the jumper to positions 1 and 2 (the pin closest to the Winchester connector).

  • Page 62: Table 3-6. 37-Pin Connector Pinouts (Optional)

    SDM-300L3 Satellite Modem Revision 1 Connector Pinouts MN/SDM300L3.IOM Table 3-6. 37-Pin Connector Pinouts (Optional) Pin # EIA-422/MIL-188-144 1, 19 Shield SD-A ST-A RD-A RS-A RT-A CS-A DM-A RR-A MC-A TT-A 20, 37 SIGGND SD+B ST+B RD+B RS+B RT+B CS+B DM+B...

  • Page 63: Table 3-7. 50-Pin Connector Pinouts

    SDM-300L3 Satellite Modem Revision 1 Connector Pinouts MN/SDM300L3.IOM Table 3-7. 50-Pin Connector Pinouts 50-Pin D Connector Pin # Async D&I AGC Out AGC Out AGC Out AGC Out EIA-422 TXOctA In ESC TXDB In (EIA-485 only) EIA-422 TXOctB In ESC TXDA In...
  • Page 64 SDM-300L3 Satellite Modem Revision 1 Connector Pinouts MN/SDM300L3.IOM Notes: 1. IDR configuration connector pinouts: Backward alarm relay contacts are named for normal no fault conditions (BWOx-C connected to BWOx-NC if no fault). Backward alarm inputs should be grounded or pulled logic low to clear the alarm.

  • Page 65: G.703 T1, E1/Async Interface Adapter

    SDM-300L3 Satellite Modem Revision 1 Connector Pinouts MN/SDM300L3.IOM 3.2.4 G.703 T1, E1/ASYNC Interface Adapter The G.703 T1, E1/ASYNC Interface Adapter has three BNC connectors and a 15-pin subminiature D connector. BNC connectors (SD (J2) and RD (J3) support the G.703 unbalanced 75Ω TX and RX data interfaces.

  • Page 66: Auxiliary 1 Connector And Pinouts (J9)

    SDM-300L3 Satellite Modem Revision 1 Connector Pinouts MN/SDM300L3.IOM 3.2.5 Auxiliary 1 Connector and Pinouts (J9) The auxiliary 1 (AUX 1) connector provides: • MOD and DEMOD (TTL) faults • Satellite clock • Satellite I&Q • Automatic Gain Control (AGC) output voltage The faults are open collector levels that indicate a modulator or demodulator failure.

  • Page 67: Alarms Connector And Pinouts (J10)

    SDM-300L3 Satellite Modem Revision 1 Connector Pinouts MN/SDM300L3.IOM 3.2.6 Alarms Connector and Pinouts (J10) The alarm connector provides Form C contact closures for alarm reporting. The two Form C summary fault contacts are Modulator and Demodulator. The alarm connection is a 9-pin female D connector (J10) located on the rear panel of the modem.

  • Page 68: Ac Power Connector

    SDM-300L3 Satellite Modem Revision 1 Connector Pinouts MN/SDM300L3.IOM 3.2.10 AC Power Connector A standard, detachable, non-locking, 3-prong power cord (IEC plug) supplies the Alternating Current (AC) power to the modem. Observe the following: 55W maximum, 40W typical Input Power without BUC power supply...

  • Page 69: Chapter 4. Front Panel Operation

    Chapter 4. FRONT PANEL OPERATION Front Panel The modem front panel (Figure 4-1) enables control of modem configuration parameters and displays the modem status. Figure 4-1. Front Panel View The front panel features include: • 32-character, 2-line LCD display • 6-button keypad for local control •...

  • Page 70: Led Indicators

    SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM LED Indicators The 10 LEDs on the front panel indicate: • General modem summary faults • Status • Alarms The indicators are defined in Table 4-1 as follows: Table 4-1. LED Indicators...

  • Page 71: Front Panel Keypad

    SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM Front Panel Keypad The front panel keypad permits local operation of the modem. The keypad consists of six keys (Figure 4-2). ENTER CLEAR Figure 4-2. Keypad Each key provides one or more logical functions. These functions are defined in the following table.

  • Page 72: Menu System

    SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM Menu System Note: The menus show features and options that are not available. However, they are shown to preserve the menu structure and reserve the structure for the future. This does not imply an intent or obligation to add these features or options in the future.

  • Page 73: Revision Emulation

    Notes: 1. Figure 4-3 list the front panel menu window selections. 2. Comtech EF Data recommends that selection of the desired Modem Type be made prior to making any other setting. This procedure is located in the Utility Modem Type menu.

  • Page 74: Power Class

    SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM Menu Tree SELECT (4.6) CONFIGURATION (4.6.1) CONFIGURATION TX CLOCK SOURCE TX-X CODE/DATA RATE MODULATOR TX CLOCK PHASE DEMODULATOR TX-IF FREQUENCY MONITOR EXT-CLK FREQ TX TERMINAL FREQ INTERFACE BUFFER CLOCK LOCAL AUPC...

  • Page 75: Opening Screen

    SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM OPENING SCREEN This screen is displayed whenever power is first applied to the unit. SDM-300L3 CUSTOM VER: X.X.X Press [→] key to go to the any of the following FUNCTIONAL SELECT menu screens •...
  • Page 76 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM 4.6.1.1 FUNCTION SELECT: CONFIGURATION: MODULATOR CONFIGURATION MODULATOR Press <ENTER > to review or edit the following sub-menus. FUNCTION SELECT: CONFIGURATION: MODULATOR: TX-X CODE/DATA RATE TX-A QPSK 64.000 Kbps TX-B QPSK 1/2 128.000 Kbps...
  • Page 77 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM To change the rate using the variable rate selection, press <ENTER> when TX-V is displayed. A flashing cursor is displayed on the first character of the coding type on line 1. Press [←] or [→] to move the flashing cursor, and [↑] or [↓] to increment or decrement the digit at the flashing cursor.
  • Page 78 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM FUNCTION SELECT: CONFIGURATION: MODULATOR: TX-IF FREQUENCY (CONDITIONAL) TX-IF FREQUENCY 1200.0000 MHz Conditional: This menu is displayed when LO is programmed to 0 under Utility: Modulator: TX Terminal LO menu. IMPORTANT Programs the modulator transmit frequency between 950 and 1750 MHz, in 100 Hz steps.
  • Page 79 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM FUNCTION SELECT: CONFIGURATION: MODULATOR: TX-IF OUTPUT TX-IF OUTPUT Programs the modulator output On or Off. Upon entry, the current status of the output is displayed. Press [↑] or [↓] to make the selection. Press <ENTER> to execute the change.
  • Page 80 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM FUNCTION SELECT: CONFIGURATION: MODULATOR: SCRAMBLER SCRAMBLER Programs the scrambler On or Off. Upon entry, the current status of the scrambler is displayed. Press [↑] or [↓] to make the selection. Press <ENTER> to execute the change.

  • Page 81: Carrier Mode

    SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM FUNCTION SELECT: CONFIGURATION: MODULATOR: CARRIER MODE CARRIER MODE NORMAL-MODULATED Programs the modem for alternate carrier modes. All modes, except Normal-Modulated are Test Modes. Four modes of operation are available: NORMAL-MODULATED This mode is normally selected.
  • Page 82 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM FUNCTION SELECT: CONFIGURATION: MODULATOR: FSK OUTPUT FSK OUTPUT Note: FSK is operational only with a BUC or ODU that incorporates FSK capabilities. Programs the FSK Output On or Off. Upon entry, the current status of the FSK Output is displayed.

  • Page 83: Odu 10 Mhz Ref

    SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM FUNCTION SELECT: CONFIGURATION: MODULATOR: ODU OUTPUT DELAY ODU OUTPUT DELAY 00.00 MIN SEC Programs the ODU Output delay with 0.0 to 20.00 minutes. At power up, the M&C delays carrier turn On by the programmed time. During output delay timeout, the front panel carrier On LED flashes and the ODU output delay screen shows the remaining delay time.
  • Page 84 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM FUNCTION SELECT: CONFIGURATION: MODULATOR: RS ENCODER (CONDITIONAL) RS ENCODER Conditional: Reed-Solomon option only. IMPORTANT Programs the Reed-Solomon Encoder On or Off. Upon entry, the current status of the Reed-Solomon encoder is displayed. Press [↑] or [↓] to make the selection.
  • Page 85 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM RX-C QPSK 1/2 256.000 Kbps RX-D QPSK 1/2 512.000 Kbps RX-V QPSK 1/2 38.400 Kbps Upon entry, the current transmitter rate is displayed with the flashing cursor on the first character of the code rate on line 1. Line 2 displays the data rate. Press [←] or [→] to make the selection.
  • Page 86 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM Code Rate Data Rate Range Non-Turbo Requirements BPSK 1/2 2.4 to 1250 kbps {O}QPSK 1/2 4.8 to 2500 kbps {O}QPSK 3/4 7.2 to 3750 kbps QPSK 7/8 8.4 to 4375 kbps 8-PSK 2/3 64.0 to 5000 kbps...
  • Page 87 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM FUNCTION SELECT: CONFIGURATION: DEMODULATOR: RX TERMINAL FREQUENCY (CONDITIONAL) RX TERMINAL FREQUENCY 4200.0000 MHz Conditional: This menu is available only when RX Terminal LO and Mix are programmed under Utility: Demodulator menu.
  • Page 88 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM FUNCTION SELECT:CONFIGURATION:DEMODULATOR: DIFF. DECODER DIFF. DECODER Programs the differential decoder On or Off. Upon entry, the current status of the differential decoder is displayed. Press [↑] or [↓] to make the selection. Press <ENTER> to execute the change.

  • Page 89: Figure 4-4. Rf Loopback

    SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM FUNCTION SELECT: CONFIGURATION: DEMODULATOR: RF LOOP BACK RF LOOP BACK This is a Test Mode. IMPORTANT Programs the modem for RF loopback operation. When RF loopback is turned on, the demodulator is programmed to the same frequency as the modulator. When RF loopback is turned off, the demodulator is tuned to the previous frequency.

  • Page 90: Figure 4-5. If Loopback

    SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM FUNCTION SELECT: CONFIGURATION: DEMODULATOR: IF LOOP BACK IF LOOP BACK This is a Test Mode. IMPORTANT Programs the modem for IF loopback operation. When IF loopback is turned on, the demodulator input is connected to the modulator output through an internal attenuator and the modulator continues to TX a signal.
  • Page 91 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM FUNCTION SELECT: CONFIGURATION: DEMODULATOR: BER THRESHOLD BER THRESHOLD NONE Sets the BER threshold. If the BER threshold set is exceeded, a receive fault will be indicated by the modem status indicators. BER threshold may be set from 1.0 E-3 to 1.0 E-8, or may be disabled by specifying NONE.
  • Page 92 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM FUNCTION SELECT: CONFIGURATION: DEMODULATOR: SWEEP RANGE SWEEP RANGE 60000 Programs the overall travel of the sweep width range during acquisition in the directed sweep mode. The sweep width may be set from 0 to 1,000,000 Hz. When set at 60000 Hz, the modem is in the default acquisition mode.
  • Page 93 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM FUNCTION SELECT: CONFIGURATION: DEMODULATOR: LNB POWER LNB POWER Programs the LNB Power On or Off. The LNB voltage is transmitted up the center conductor of the RF-IF connector. Upon entry, the current status of the descrambler is displayed. Press [↑] or [↓] to make the selection.
  • Page 94 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM FUNCTION SELECT: CONFIGURATION: DEMODULATOR: RS DECODER RS DECODER Programs the Reed-Solomon decoder On, Off, or Correction_Off. Upon entry, the current status of the Reed-Solomon decoder is displayed. Use [↑] or [↓] to select one of the following modes: Enables the Reed-Solomon decoder to provide data error corrections.
  • Page 95 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM 4.6.1.3 FUNCTION SELECT: CONFIGURATION: INTERFACE CONFIGURATION INTERFACE Press <ENTER > to review or edit the following sub-menus. FUNCTION SELECT: CONFIGURATION: INTERFACE: TX CLOCK SOURCE TX CLOCK SOURCE TX TERRESTRIAL Programs the clock source for the modem transmitter clock to the following...
  • Page 96 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM FUNCTION SELECT: CONFIGURATION: INTERFACE: TX CLOCK PHASE TX CLOCK PHASE AUTO Programs the TX clock phase to AUTO, NORMAL, or INVERT. Note: AUTO is the default. Upon entry, the current setting of the TX clock phase is displayed. Press [↑] or [↓] to make the selection.
  • Page 97 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM FUNCTION SELECT: CONFIGURATION: INTERFACE: BUFFER CLOCK BUFFER CLOCK RX (SATELLITE) Programs the interface buffer output clock to one of the following modes: RX (SATELLITE) Sets the output buffer clock to the satellite clock.

  • Page 98: Figure 4-6. Baseband Loopback

    SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM FUNCTION SELECT: CONFIGURATION: INTERFACE: B-BAND LOOP BACK B-BAND LOOP BACK This is a Test Mode. IMPORTANT Programs the modem for baseband loopback operation. When baseband loopback is turned on, the data and timing signals are switched from the demodulator to the modulator on the modem side of the interface.

  • Page 99: Figure 4-7. Interface Loopback

    SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM FUNCTION SELECT: CONFIGURATION: INTERFACE: INTRFC LOOP BACK (CONDITIONAL) INTRFC LOOP BACK This is a Test Mode. Conditional: This menu is only available when the overhead interface PCB or Reed-Solomon PCB is installed.
  • Page 100 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM FUNCTION SELECT: CONFIGURATION: INTERFACE: BUFFER SIZE (CONDITIONAL) Conditional: The Bits or Milliseconds menu is displayed depending upon whether Bits or Milliseconds is selected under the Utility: Interface Buffer Program menu. IMPORTANT...
  • Page 101 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM FUNCTION SELECT: CONFIGURATION: INTERFACE: BUFFER CENTER BUFFER CENTER YES/NO This configuration function is used to center the buffer. Choosing YES centers the buffer. Press <ENTER> twice to center the buffer. FUNCTION SELECT: CONFIGURATION: INTERFACE:...
  • Page 102 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM Upon entry, the current TX data fault that is being monitored is displayed. Press [↑] or [↓] to make the selection. Press [ENTER] to execute the change. FUNCTION SELECT: CONFIGURATION: INTERFACE:...
  • Page 103 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM FUNCTION SELECT: CONFIGURATION: INTERFACE: RX 2047 PATTERN (CONDITIONAL) RX 2047 PATTERN The is a Test Mode. Conditional: This menu is only available when the overhead interface PCB is installed. IMPORTANT Programs the modem to receive a 2047 pattern as the normal receive data, and allows the BER monitor to work on that 2047 pattern.
  • Page 104 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM FUNCTION SELECT: CONFIGURATION: INTERFACE: RX CODING FORMAT (CONDITIONAL) RX CODING FORMAT Conditional: This menu is only available when the RX G.703 interface is programmed. This requires installation of the optional Overhead Card.
  • Page 105 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM CHANNEL: TX-1 LEVEL = -5 dBm CHANNEL: TX-2 LEVEL = -5 dBm CHANNEL: RX-1 LEVEL = -5 dBm CHANNEL: RX-2 LEVEL = -5 dBm 4–37...
  • Page 106 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM FUNCTION SELECT: CONFIGURATION:INTERFACE: DROP FORMAT (CONDITIONAL) DROP FORMAT This menu is only available when the optional D&I have been selected for Modem Type in the Utility menu and the Overhead Card is installed.
  • Page 107 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM FUNCTION SELECT: CONFIGURATION: INTERFACE: INSERT FORMAT (CONDITIONAL) INSERT FORMAT Conditional: This menu is only available when optional D&I have been selected for Modem Type in the Utility menu and the Overhead Card is installed.
  • Page 108 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM FUNCTION SELECT: CONFIGURATION: INTERFACE: DROP CHANNEL ASSIGNMENTS (CONDITIONAL) DROP CHANNEL ASSIGNMENTS Conditional: This menu is only available when the optional D&I have been selected for Modem Type in the Utility menu and the Overhead Card is installed.
  • Page 109 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM FUNCTION SELECT: CONFIGURATION: INTERFACE: INSERT CHANNEL ADJUSTMENTS (CONDITIONAL) INSERT CHANNEL ASSIGNMENTS Conditional: This menu is only available when the optional D&I are installed has been selected for Modem Type in the Utility menu and the Overhead Card is installed.
  • Page 110 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM FUNCTION SELECT: CONFIGURATION: INTERFACE: ASYNC TX BAUD (CONDITIONAL) ASYNC TX BAUD 110 bps Conditional: The menu is only available when Modem Type = ASYNC and requires that the Overhead Card is installed.
  • Page 111 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM FUNCTION SELECT: CONFIGURATION: INTERFACE: ASYNC TX LENGTH (CONDITIONAL) ASYNC TX LENGTH 7 BITS Conditional: The menu is only available when Modem Type = ASYNC and requires that the Overhead Card is installed.
  • Page 112 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM FUNCTION SELECT: CONFIGURATION: INTERFACE: ASYNC TX STOP (CONDITIONAL) ASYNC TX STOP 2 BITS Conditional: The menu is only available when Modem Type = ASYNC and requires that the Overhead Card is installed.
  • Page 113 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM FUNCTION SELECT: CONFIGURATION: INTERFACE: ASYNC TX PARITY (CONDITIONAL) ASYNC TX PARITY EVEN Conditional: The menu is only available when Modem Type = ASYNC and requires that the Overhead Card is installed.
  • Page 114 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM 4.6.1.4 FUNCTION SELECT: CONFIGURATION: LOCAL AUPC (CONDITIONAL) CONFIGURATION LOCAL AUPC Conditional: This menu is displayed when Local Modem AUPC = ON located under the Utility: Modem Type menu. IMPORTANT The menu is available in several modes: Self-Monitoring AUPC with 1 In this mode ASYNC is not used.
  • Page 115 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM FUNCTION SELECT: CONFIGURATION: LOCAL AUPC: NOMINAL POWER (CONDITIONAL) NOMINAL POWER -10.0 dBm Conditional: This menu is displayed when Local Modem AUPC = ON located under the Utility: Modem Type menu. IMPORTANT Programs the nominal power value of the AUPC.
  • Page 116 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM FUNCTION SELECT: CONFIGURATION: LOCAL AUPC: MAXIMUM POWER (CONDITIONAL) MAXIMUM POWER -5.0 dBm Conditional: This menu is displayed when Local Modem AUPC = ON located under the Utility: Modem Type menu. IMPORTANT Programs the maximum power level of the AUPC.
  • Page 117 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM FUNCTION SELECT: CONFIGURATION: LOCAL AUPC: TRACKING RATE (CONDITIONAL) TRACKING RATE 5.0 dB/Min Conditional: This menu is displayed when Local Modem AUPC = ON located under the Utility: Modem Type menu. IMPORTANT Programs the maximum tracking rate of the AUPC.
  • Page 118 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM FUNCTION SELECT:CONFIGURATION:LOCAL AUPC: REMOTE CL ACTION (CONDITIONAL) REMOTE CL ACTION HOLD Conditional: This menu is displayed when Local Modem AUPC = ON located under the Utility: Modem Type menu. IMPORTANT Programs the Remote Carrier Loss action (CL) for HOLD, NOMINAL, or MAXIMUM.
  • Page 119 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM 4.6.1.2 FUNCTION SELECT: CONFIGURATION: MUX (OPTIONAL/CONDITIONAL) Conditional: This menu is available only if the optional MUX card (slot #1) is installed. IMPORTANT CONFIGURATION The multiplexer (MUX) system provides for 1 to 8 tributary channels to be multiplexed onto a single aggregate carrier.
  • Page 120 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM FUNCTION SELECT: CONFIGURATION: MUX:TRIBUTARY #N TRIBUTARY #N 2048.0Kbps RS422 N = 1 through 7 TRIBUTARY #8 DISABLED RS232 Range: 0.6 to 4000.0 kbps (in 100 bps steps) or DISABLED, RS232, or RS422 Select the tributary number (1 through 8), data rate (0.6 to 4000 kbps), and...
  • Page 121 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM Note: If only 4-Channel SYNC/ASYNC is enabled, only tributaries 1 to 4 will be displayed. FUNCTION SELECT: CONFIGURATION: MUX: AGGREGATE DATA RATE AGGREGATE DR 2305.3 Kbps 3.7 to 4001.3 kbps > 4001.3 or < 3.7 kbps, status only The aggregate data rate is the sum of all tributary data rates plus the multiplex overhead 4.6.1.3...
  • Page 122 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM FUNCTION SELECT: CONFIGURATION: FLEX MUX: TX CHAN #1 MODE TX CHAN #1 MODE D&I ENABLED TX CHANNEL 1 MODE: D&I ENABLED, T1/E1 ENABLED, or DISABLED Normal D&I/G.703 menus are operational. FUNCTION SELECT: CONFIGURATION: FLEX MUX:...
  • Page 123 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM FUNCTION SELECT: CONFIGURATION: FLEX MUX: TX CHAN #3 MODE TX CHAN #3 MODE SYNC RS422 TX CHANNEL 3 MODE: ASYNC RS232, SYNC RS232, ASYNC RS422, SYNC RS422, AUPC, or DISABLED Async communications are fixed at 10 bits per word.
  • Page 124 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM FUNCTION SELECT: CONFIGURATION: FLEX MUX: TX CHAN #4 MODE TX CHAN #4 MODE ASYNC RS485 TX CHANNEL 4 MODE: ASYNC RS232, SYNC RS232, ASYNC RS485, AUPC, or DISABLED Async communications are fixed at 10 bits per word.
  • Page 125 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM FUNCTION SELECT: CONFIGURATION: FLEX MUX: RX CHAN #1 MODE RX CHAN #1 MODE D&I ENABLED RECEIVE CHANNEL 1 MODE: D&I ENABLED, T1/E1 ENABLED, or DISABLED Normal D&I/G.703 menus are operational. FUNCTION SELECT: CONFIGURATION: FLEX MUX:...
  • Page 126 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM FUNCTION SELECT: CONFIGURATION: FLEX MUX: RX CHAN #3 DATA RATE RX CHAN #3 DR 64.0 Kbps RECEIVE CHANNEL 3 DATA RATE: SYNC RS422: 0.6 to 4000.0 kbps All other modes: 0.6 to 64.0 kbps Note: DR command is not displayed if AUPC or DISABLED were selected for MODE.
  • Page 127 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM FUNCTION SELECT: CONFIGURATION: FLEX MUX: RX CHAN #4 DATA RATE RX CHAN #4 DR 9.6 Kbps RECEIVE CHANNEL 4 DATA RATE: 0.6 to 64.0 kbps Note: DR is not displayed if AUPC or DISABLED were selected for MODE.
  • Page 128 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM 4.6.1.5 FUNCTION SELECT: CONFIGURATION: SAVE CONFIGURATION SAVE CONFIGURATION SAVE: 1, 2, 3, 4 or 5 The Configuration Save menu allows programming of configuration parameters into non- volatile memory on the M&C. There are five memory locations that may be used to store specific configuration setups that are used frequently.
  • Page 129 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM 4.6.2 FUNCTION SELECT: MONITOR FUNCTION SELECT MONITOR Press <ENTER > to review or edit the following sub-menus. FUNCTION SELECT: MONITOR: RAW BER RAW BER 2.4 E-3 Displays the current BER or “No Data” (if carrier is not locked).
  • Page 130 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM FUNCTION SELECT: MONITOR:EB/NO EB/NO 16.0 dB Displays the current E or “No Data” (if carrier is not locked). Range: 2.0 to 16.0 dB. Notes: 1. Low limit is based on the data rate.
  • Page 131 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM FUNCTION SELECT: MONITOR: BUFFER FILL BUFFER FILL Displays the current plesiochronous buffer fill status percent. Range: 1 to 99%. FUNCTION SELECT: MONITOR: FRAME ERRORS (CONDITIONAL) FRAME ERRORS n.n E-e 2047 ERRORS n.n E-e...
  • Page 132 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM FUNCTION SELECT: MONITOR: LNB CURRENT LNB CURRENT XXX mA Monitors the LNB current or “LNB POWER OFF.” Current displayed is 0 to 500 mA in 1 mA increments. FUNCTION SELECT: MONITOR: LNB VOLTAGE...

  • Page 133: Function Select: Monitor

    SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM FUNCTION SELECT: MONITOR: ODU VOLTAGE ODU VOLTAGE XX.X VOLTS Monitors the ODU voltage or “ODU POWER OFF.” Voltage displayed is 0 to 64 volts, in 0.1 volt increments. FUNCTION SELECT: MONITOR: ODU OUTPUT LEVEL...
  • Page 134 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM FUNCTION SELECT: MONITOR: ODU TEMPERATURE (CONDITIONAL) ODU TEMPERATURE + XX°C/OK Conditional: This menu is displayed when FSK and ODU POWER SUPPLY are ON under the Configuration: Modulator menu. IMPORTANT Displays ODU (BUC) temperature of 00 ± 99°C of an FSK capable BUC.
  • Page 135 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM FUNCTION SELECT: MONITOR: ODU SOFTWARE (CONDITIONAL) ODU SOFTWARE VER: XX Conditional: This menu is displayed when FSK and ODU POWER SUPPLY are ON under the Configuration: Modulator menu. IMPORTANT Displays the ODU current software version 0 to 15 of an FSK capable BUC.

  • Page 136: Function Select Faults/Alarms

    SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM FUNCTION SELECT: MONITOR: RX L-BAND FREQ (CONDITIONAL) RX L-Band FREQ 1200.0000 MHz Conditional: This menu is displayed when the RX Terminal LO (frequency) and Mix is programmed under the Utility: Demodulator RX Terminal LO menu.
  • Page 137 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM FUNCTION SELECT: FAULTS/ALARMS: MODULATOR MODULATOR --------- IF SYNTHESIZER Modulator IF synthesizer fault. DATA CLOCK SYN Transmit clock synthesizer fault. Indicates the internal Voltage Controlled Oscillator (VCO) has not locked to the incoming data clock.
  • Page 138 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM FUNCTION SELECT: FAULTS/ALARMS: TX INTERFACE TX INTERFACE -------- TX DROP Drop interface hardware fault. Typically indicates that the drop interface PLL is not locked (D&I only). (Overhead Card only.) TX DATA/AIS Data or AIS.
  • Page 139 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM FUNCTION SELECT: FAULTS/ALARMS: RX INTERFACE RX INTERFACE --------------- BUFFER UNDERFLOW Buffer underflow alarm. Indicates that a buffer underflow has occurred. BUFFER OVERFLOW Buffer overflow alarm. Indicates that a buffer overflow has occurred.

  • Page 140: Backward Alarms

    SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM FUNCTION SELECT: FAULTS/ALRMS: COMMON COMMON ------- BATTERY/CLOCK Battery or clock fault. -12V SUPPLY -12V power supply fault. +12V SUPPLY +12V power supply fault. +5V SUPPLY +5V power supply fault. SELF TEST Built in self test fault.
  • Page 141 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM FUNCTION SELECT: FAULTS/ALARMS: OUTDOOR UNIT OUTDOOR UNIT ----- Note: Faults are only displayed if active. Fault Active - When: Current Displays a current fault. ODU (BUC) Power is On and Low or/High Current Alarm set.

  • Page 142: Function Select Stored Flts/Alms

    SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM 4.6.4 FUNCTION SELECT: STORED FLTS/ALMS FUNCTION SELECT STORED FLTS/ALMS Press <ENTER > to review or edit the following sub-menus. The modem stores the first 10 (Flt0 through Flt9) occurrences of fault status changes in each of the following major fault categories: Each fault status change is stored with the time and date of the occurrence of the fault.
  • Page 143 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM FUNCTION SELECT: STORED FLTS/ALMS: MODULATOR MODULATOR STORED TIME/DATE Displays the stored date and time of a fault or alarm, such as: • IF SYNTHESIZER • DATA CLOCK SYN • I CHANNEL •...
  • Page 144 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM FUNCTION SELECT:STORED FLTS/ALMS:TX INTERFACE TX INTERFACE STORED TIME/DATE Displays the stored date and time of a fault or alarm, such as: • TX DROP • TX DATA/AIS • TX CLK PLL •...
  • Page 145 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM FUNCTION SELECT: STORED FLTS/ALMS: COMMON COMMON STORED TIME/DATE Displays the stored date and time of a fault or alarm, such as: • BATTERY/CLOCK • -12 VOLT SUPPLY • +12 VOLT SUPPLY •...
  • Page 146 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM FUNCTION SELECT: STORED FLTS/ALMS: OUTDOOR UNIT OUTDOOR UNIT _ _ _ _ _ Displays the stored outdoor unit fault or alarm, such as: • CURRENT ODU POWER ON ONLY • VOLTAGE ODU POWER ON ONLY •...

  • Page 147: Function Select: Remote Aupc (Conditional)

    SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM 4.6.5 FUNCTION SELECT: REMOTE AUPC (CONDITIONAL) FUNCTION SELECT REMOTE AUPC Conditional: This menu is available when either the ASYNC or AUPC selection is made from the Modem Type menu, located under the Utility: Modem Type menu.
  • Page 148 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM FUNCTION SELECT: REMOTE AUPC: CONFIGURATION: AUPC ENABLE (CONDITIONAL) AUPC ENABLE Conditional: This menu is available when either the ASYNC or AUPC selection is made from the Modem Type menu, located under the Utility: Modem Type menu.
  • Page 149 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM FUNCTION SELECT: REMOTE AUPC: CONFIGURATION: TX 2047 PATTERN (CONDITIONAL) TX 2047 PATTERN Conditional: This menu is available when either the ASYNC or AUPC selection is made from the Modem Type menu, located under the Utility: Modem Type menu.
  • Page 150 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM FUNCTION SELECT: REMOTE AUPC: CONFIGURATION: REMOTE AUPC: MONITOR: 2047 ERRORS (CONDITIONAL) 2047 ERRORS n.n E-e Conditional: This menu is available when either the ASYNC or AUPC selection is made from the Modem Type menu, located under the Utility: Modem Type menu.
  • Page 151 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM 4.6.6 FUNCTION SELECT: UTILITY FUNCTION SELECT UTILITY The Function Select: Utility menu is divided into the following categories: 4.6.6.1 FUNCTION SELECT: UTLITY: FIXED MODEM RATE UTILITY FIXED MODEM RATE FUNCTION SELECT: UTLITY: FIXED MODEM RATE:...
  • Page 152 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM 4.6.6.2 FUNCTION SELECT: UTILITY: MODULATOR UTILITY MODULATOR Select information to view using the [←] [→] arrow keys, then press ENTER. FUNCTION SELECT: UTLITY: MODULATOR: ASSIGN TRANSMIT FILTERS Note: The setting in the following menus, changes the settings in the menus that appear under the Configuration: Modulator menus.
  • Page 153 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM Select one of four (A, B, C, or D) pre-defined transmitter code/data rate combinations or a variable rate selection (V). Code Rate Data Rate Range Non-Turbo Requirements BPSK 1/2 2.4 to 1250 kbps {O}QPSK 1/2 4.8 to 2500 kbps...
  • Page 154 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM FUNCTION SELECT: UTILITY: MODULATOR: TX TERMINAL LO TX TERMINAL LO 0 MHz MIX:- Valid selections entered into this menu make it possible to directly program the frequency transmitted from the satellite terminal using the Configuration: Modulator: Terminal Frequency menu.
  • Page 155 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM FUNCTION SELECT: UTILITY: MODULATOR: MOD POWER OFFSET MOD POWER OFFSET + 0.0 dB Modulator power offset adjusts. Offsets the modulator output power readout in the Configuration menu. This feature does not actually change the modulator power level, but displays an offset value in the monitor.
  • Page 156 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM FUNCTION SELECT: UTILITY: MODULATOR: ENCODER TYPE ENCODER TYPE VITERBI Encoder type selection. Select VITERBI, SEQUENTIAL, or TURBO encoder type. Notes: 1. A Sequential Encoder Type and a 3/4 Code Rate combination are not compatible with a CSC CLOSED Modulator Type.
  • Page 157 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM FUNCTION SELECT: UTILITY: MODULATOR: TX BPSK ORDERING TX BPSK ORDERING STANDARD TX BPSK bit ordering selection. Select STANDARD or NON-STANDARD. FUNCTION SELECT: UTILITY: MODULATOR: MOD SPECTRUM MOD SPECTRUM NORMAL Programmable vector rotation allows the operator to select NORMAL or INVERT for spectrum reversal of the I and Q baseband channels.

  • Page 158: Function Select: Utility

    SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM FUNCTION SELECT: UTILITY:MODULATOR: TX IESS-310 MODE (CONDITIONAL) TX IESS-310 MODE Conditional: Only available when 8-PSK option and RS option are installed and selected. IMPORTANT An On indication enables 8-PSK 2/3 with Reed-Solomon.
  • Page 159 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM FUNCTION SELECT: UTILITY: MODULATOR: ODU ALARM - LOW ODU ALARM - LOW 0 MA Sets ODU Alarm – Low within 0 to 4000 mA, in 1 mA steps. An alarm is produced whenever the ODU or BUC current falls below the programmed limit.
  • Page 160 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM Notes: 1. For the RF ON Condition: the TX-IF shall be programmed On. 2. For RTS TX-IF, when enabled overrides CD. This command allows for enabling or disabling of the TX carrier output depending on the described conditions.
  • Page 161 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM FUNCTION SELECT:UTILITY:DEMODULATOR: ASSIGN RECEIVE FILTERS Note: The setting in the following menus, changes the settings in the menus that appear under the Configuration: Demodulator menus. RX-A QPSK 1/2 64.000 Kbps RX-B QPSK 1/2 128.000 Kbps...
  • Page 162 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM Select one of four (A, B, C, or D) pre-defined receiver code/data rate combinations or a variable rate selection (V). Code Rate Data Rate Range Non-Turbo Requirements BPSK 1/2 2.4 to 1250 kbps {O}QPSK 1/2 4.8 to 2500 kbps...
  • Page 163 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM FUNCTION SELECT:UTILITY: DEMODULATOR: RX TERMINAL LO RX TERMINAL LO O MHz MIX: - Valid selections entered into this menu make it possible to directly program the frequency received by the satellite terminal using the Configuration: Demodulator: Terminal Frequency menu.

  • Page 164: Descrambler Type

    SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM FUNCTION SELECT: UTILITY: DEMODULATOR: DEMODULATOR TYPE (CONDITIONAL) DEMODULATOR TYPE INTELSAT OPEN Conditional: RX FILTER TYPE is selectable only when Custom is selected for modem type in the Utility: Modem Type menu.
  • Page 165 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM Intelsat V.35, FDC MOD V.35, ITU V.35, or Off. Descrambler Type Description Intelsat V.35 Self-SYNC scrambling per IESS-308. FDC MOD V.35 Compatible with Fairchild modems. ITU V.35 Closed Network Viterbi and Sequential with No Reed-Solomon.
  • Page 166 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM FUNCTION SELECT: UTILITY: DEMODULATOR: RX-RS N/K DEEP (CONDITIONAL) RX-RS N/K DEEP 225/205 Conditional: This menu is active only when Reed-Solomon (RS) is installed and RS Option is On (under Configuration: Demodulator).
  • Page 167 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM FUNCTION SELECT: UTILITY: DEMODULATOR: LNB ALARM - LOW LNB ALARM - LOW 0 mA Status Only. Programmable within 0 to 500 mA, in 1 mA steps. An alarm is generated whenever the LNB current falls below the programmed limit.
  • Page 168 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM 4.6.6.4 FUNCTION SELECT: UTILITY: INTERFACE UTILITY INTERFACE Select information to view using the [←] [→] arrow keys, then press ENTER. FUNCTION SELECT: UTILITY: INTERFACE: TX OVERHEAD TYPE TX OVERHEAD TYPE NONE Select None, IDR, IBS, DROP &...
  • Page 169 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM FUNCTION SELECT: UTILITY: INTERFACE: TX TERR INTERFACE (CONDITIONAL) TX TERR INTERFACE RS422 Conditional: G.703 is available only when the overhead interface card is installed. IMPORTANT Displays the TX interface type EIA-232, EIA-422, V.35, or G.703.
  • Page 170 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM FUNCTION SELECT: UTILITY: INTERFACE: BUFFER PROGRAM BUFFER PROGRAM BITS Allows selection of either Bits or Milliseconds for the receive buffer. • For the modem to calculate buffer size, select Milliseconds. •...
  • Page 171 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM FUNCTION SELECT: UTILITY: INTERFACE: FRAMING STRUCTURE: INTERFACE: FRAMING STRUCTURE: T1 FRAMING T1 FRAMING STRUCTURE: G.704 Upon entry, the framing type (T1 or E1) is displayed on Line 1. The framing structure of each type (None or G.704) is displayed on Line 2.
  • Page 172 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM FUNCTION SELECT: UTILITY: INTERFACE: TX DATA PHASE TX DATA PHASE NORMAL TX data phase relationship. Use this option to select Normal or Invert for the TX data relationship to the selected TX clock.
  • Page 173 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM FUNCTION SELECT:UTILITY:INTEFACE: IDR BACKWARD ALARM CONTROL (CONDITIONAL) IDR BACKWARD ALARM CONTROL Conditional: This selection is available only when Modem Type = IDR is enabled and the Overhead card is installed. IMPORTANT Controls IDR monitor and alarm functions when not using a communications link.
  • Page 174 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM FUNCTION SELECT: UTILITY: INTERFACE: ASYNC TX TYPE (CONDITIONAL) ASYNC TX TYPE RS232 Conditional: This menu is available only with Modem Type = ASYNC is enabled and the Overhead card is installed.
  • Page 175 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM FUNCTION SELECT: UTILITY: INTERFACE: IDR RX ESC TYPE (CONDITIONAL) IDR RX ESC TYPE 2-32K AUDIO Conditional: This menu is available only with Modem Type = IDR is enabled and the Overhead card is installed.
  • Page 176 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM FUNCTION SELECT: UTILITY: INTERFACE: IBS RX ESC TYPE (CONDITIONAL) IBS RX ESC TYPE 2-32K AUDIO Conditional: This menu available only with optional Overhead card and Modem Type = IBS. IMPORTANT Select 2-32K Audio or Off for IBS RX ESC type. Selecting 2-32k audio will multiplex two 32 kbps ADPCM audio channels into 64 kbps payload data with IBS framing.
  • Page 177 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM 4.6.6.5 FUNCTION SELECT: UTILITY: OUTDOOR UNIT (CONDITIONAL) UTILITY OUTDOOR UNIT Conditional: This menu is available only when ODU Power Supply, FSK, and TX-IF Output are On. IMPORTANT FUNCTION SELECT: UTILITY: OUTDOOR UNIT:...
  • Page 178 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM FUNCTION SELECT: UTILITY: OUTDOOR UNIT: ODU OUTPUT POWER (CONDITIONAL) ODU OUTPUT POWER Conditional: This menu is available only when ODU Power Supply, FSK, and TX-IF Output are On. IMPORTANT Turns RF power at ODU/BUC On or Off. Select ODU Output Power On or Off.
  • Page 179 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM 4.6.6.6 FUNCTION SELECT: UTILITY:SYSTEM UTILITY SYSTEM Select information to view using the [←] [→] arrow keys, then press <ENTER>. FUNCTION SELECT: UTILITY: SYSTEM:TIME/DATE TIME: 12:00:00AM DATE: 7/04/1976 Time of day and date display/set function.
  • Page 180 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM FUNCTION SELECT: UTILITY: SYSTEM: REMOTE ADDRESS REMOTE ADDRESS The current modem address is displayed (1 to 255). To change the remote address, press <ENTER>. Press [↑] or [↓] to make the selection.
  • Page 181 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM FUNCTION SELECT: UTILITY: SYSTEM: YEAR DISPLAY YEAR DISPLAY 2 - DIGIT Displays the year in either 2-digits or 4-digits. To change the remote address, press <ENTER>. Press [↑] or [↓] to make the selection.
  • Page 182 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM FUNCTION SELECT: UTILITY: SYSTEM: SELF TEST SELF TEST Select OFF, AUTO, or RUN. After completion of the test, SELF TEST (“PASSED” or “FAILED”) is displayed. • OFF bypasses built-in self test.
  • Page 183 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM FUNCTION SELECT: UTILITY: SYSTEM: BOOT FIRMWARE BOOT FIRMWARE FW/NNNNNN-DDR Displays the M&C module firmware version. BOOT FIRMWARE MM/DD/YYYY Press <ENTER> to display the month, day, and year. BOOT FIRMWARE VER: x.x.x Press <ENTER>...
  • Page 184 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM FUNCTION SELECT: UTILITY: SYSTEM: DEMO MODE DEMO MODE Displays the status of the Demo Mode as either On or Off. Enables all the FAST options for the hardware installed for 1 hour.
  • Page 185 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM FUNCTION SELECT: UTILITY: SYSTEM: MASTER RESET MASTER RESET HARD/SOFT Master reset function. Initiating a hard reset will reset the modem and calls the default configuration settings from ROM. Initiating a soft reset will reset the modem hardware, but saves the current configuration settings.
  • Page 186 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM 4.6.6.7 FUNCTION SELECT: UTILITY: MODEM TYPE UTILITY MODEM TYPE Select information to view using the [←] [→] arrow keys, then press <ENTER>. FUNCTION SELECT: UTILITY: MODEM TYPE: MODEM TYPE MODEM TYPE CUSTOM Several selections from this menu require optional hardware and software.
  • Page 187 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM Use caution when modifying the Custom Type. This type accepts all changes to the modem, including incompatible parameters changes. Only experienced modem operators familiar with all the controls shall use Custom CAUTION type.
  • Page 188 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM FUNCTION SELECT: UTILITY: MODEM TYPE: CARD #1 TYPE CARD #1 TYPE OVERHEAD 01 Status Only. Displays one of the following: • OVERHEAD 01 • NOT INSTALLED FUNCTION SELECT: UTILITY: MODEM TYPE: CARD #2 TYPE...
  • Page 189 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM FUNCTION SELECT: UTILITY: MODEM TYPE: CARD #3 TYPE CARD #3 TYPE REED SOLOMON 02 Status Only. Displays one of the following: • DUPLEX REED SOLOMON • REED SOLOMON 02 • REED SOLOMON 03 •...
  • Page 190 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM FUNCTION SELECT: UTILITY: MODEM TYPE: CARD #2 OPTIONS (CONDITIONAL) CARD #2 OPTIONS Status Only. Menu appears only when Card #2 is installed. Displays one of the following: REED SOLOMON 02 LIST:...
  • Page 191 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM FUNCTION SELECT: UTILITY: MODEM TYPE: CARD #3 OPTIONS (CONDITIONAL) CARD #3 OPTIONS (Status Only.) Menu appears when Card #3 is installed. Displays one of the following: REED SOLOMON 02 LIST: INTELSAT...
  • Page 192 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM Notes: 1. When the Overhead card with the ASYNC/AUPC option is installed, and the self-monitoring Local Modem AUPC mode is needed, do not select ASYNC as the Modem Type. 2. When the Reed-Solomon card with AUPC option is installed, select AUPC from the Modem Type menu (under Utility: Modem Type menu) when AUPC between two modems is needed.
  • Page 193 Displays the CARD #3 serial number. FUNCTION SELECT: UTILITY: MODEM TYPE: CONFIGURATION CODE - MODEM CONFIGURATION CODE - MODEM Comtech EF Data-supplied code. Press <ENTER> 1)AAAAAAAAAA 2)AAAAAAAAAA On entry, the current configuration code is displayed with the flashing cursor on the first character. Press [ ] or [ ] to move the flashing cursor.
  • Page 194 Revision 1 Front Panel Operation MN/SDM300L3.IOM Entering this code enables the corresponding modem option. To purchase an option, contact an Comtech EF Data marketing representative for more information. FUNCTION SELECT: UTILITY: MODEM TYPE: CONFIGURATION CODE – CARD #1 (CONDITIONAL) CONFIGURATION CODE –...
  • Page 195 Press <ENTER> to execute the change. Entering this code enables the corresponding modem option. To purchase an option, contact an Comtech EF Data marketing representative for more information FUNCTION SELECT: MODEM TYPE: CONFIGURATION CODE – CARD #3 (CONDITIONAL) CONFIGURATION CODE –...
  • Page 196 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM 4.6.6.8 FUNCTION SELECT: UTILITY: FACTORY SET-UP UTILITY FACTORY SET-UP This configuration is used for factory alignment. Unauthorized persons should not change factory setup. Doing so can cause modem failure. CAUTION 4–128...

  • Page 197: Sdm-300L Custom Modem Defaults

    SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM SDM-300L Custom Modem Defaults Refer to Table 4-2 for custom modem defaults. Note: The following parameter do not revert to default settings after a hard reset: • • Address/Parity/Baud Rate EXT AGC Max Power •...

  • Page 198: Table 4-2. Sdm-300L Custom Modem Defaults (Continued)

    SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM Table 4-2. SDM-300L Custom Modem Defaults (Continued) Function Select Monitor RAW BER 2.4 E-3 ODU Voltage 0 mA Corrected BER 4.0 E-3 ODU Output Level xx.xx dBm E b /N 0 16.0 dB...
  • Page 199 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM Table 4-2. SDM-300L Custom Modem Defaults (Continued) Utility Interface TX Overhead Type None E1 Insert CRC RX Overhead Type None Backward Alarm RX #X TX Terr Interface RS422 ASYNC TX Type...
  • Page 200 SDM-300L3 Satellite Modem Revision 1 Front Panel Operation MN/SDM300L3.IOM This page is intentionally left blank. 4–132...

  • Page 201: Chapter 5. Modem Type

    Chapter 5. MODEM TYPE This section provides additional detail about the Modem Type setting located under the Function Select: Utility: Modem Type menu. Modem Type This section provides additional detail information about the Modem Type setting located under the Utility: Modem Type menu. Refer to Table 5-1 for configuring the modem to the following types of operation.

  • Page 202: Idr Operation

    SDM-300L3 Satellite Modem Revision 1 Modem Types MN/SDM300L3.IOM IDR Operation To operate the modem in the IDR configuration, the following cards must be installed in the modem: • Overhead G.703/IDR/IBS/ASYNC/AUPC/D&I card • 50-pin D relay adapter card The IDR option is a FAST feature that must be enabled using the front panel and the Utility Modem Type menu.

  • Page 203: 309 Ibs Operation

    SDM-300L3 Satellite Modem Revision 1 Modem Types MN/SDM300L3.IOM IBS Operation To operate the modem in the IBS configuration, the following cards shall be installed in the modem: • Overhead G.703/IDR/IBS/ASYNC/AUPC/D&I card • 50-pin D relay adapter card The IBS option is a FAST feature that shall be enabled using the front panel and the Utility: Modem Type menu.

  • Page 204: D&I Operation

    SDM-300L3 Satellite Modem Revision 1 Modem Types MN/SDM300L3.IOM D&I Operation To operate the modem in the Drop & Insert configuration, the following cards must be installed in the modem: • Overhead G.703/IDR/IBS/ASYNC/AUPC/D&I card • 50-pin D relay adapter card The D&I option is a FAST feature that must be enabled using the front panel and the Utility Modem Type menu.

  • Page 205: Async/Aupc Operation

    SDM-300L3 Satellite Modem Revision 1 Modem Types MN/SDM300L3.IOM ASYNC/AUPC Operation To operate in the Asynchronous/AUPC configuration, the following cards must be installed in the modem: • Overhead G.703/IDR/IBS/ASYNC/AUPC/D&I card • 50-pin D relay adapter card The ASYNC/AUPC option is a FAST feature that must be enabled using the front panel and the Utility Modem Type menu.

  • Page 206: Closed Network Operation (Comtech Ef Data)

    Setup is similar to the operation of Section 5.5, except, ASYNC parameters are not available. Closed Network Operation (Comtech EF Data) The modem does not require any additional hardware installed to operate in EFD Closed Network configuration. The basic modem configuration, which includes the 25-pin D Data I/O connector, supports V.35, EIA-422, and EIA-232 data with no overhead.
  • Page 207 SDM-300L3 Satellite Modem Revision 1 Modem Types MN/SDM300L3.IOM 5-7. EFD C ABLE LOSED ETWORK ARAMETER ETTINGS Parameter Front Panel Setting Reference Menu Modem Type Utility Modem Type TX Data/Code Rate TX-V, QPSK 1/2 Configuration Modulator TX-IF Output Configuration Modulator RX Data/Code Rate...

  • Page 208: Custom Operation

    SDM-300L3 Satellite Modem Revision 1 Modem Types MN/SDM300L3.IOM Custom Operation Note: If the modem serves as the backup unit for a rack of modems having different hardware and FAST options, then the backup modem shall have all of the features and hardware found in the other modems.

  • Page 209: Reed-Solomon Modes

    SDM-300L3 Satellite Modem Revision 1 Modem Types MN/SDM300L3.IOM Reed-Solomon Modes Reed-Solomon polynomial is compatible with Intelsat (IESS-308, IESS-309, IESS-310, and IESS-314). Table 5-8 shows the Reed-Solomon parameter used for various configurations. Table 5-8. Reed-Solomon Modes Modem Menu Description Configuration Modulator TX...
  • Page 210 SDM-300L3 Satellite Modem Revision 1 Modem Types MN/SDM300L3.IOM Notes: 1. For IESS-308/309 compliant operation, it is necessary to enable INTELSAT OPEN under both the Utility: Modulator and Utility: Demodulator menus before selecting an open network type from the Modem Type menu under Utitlity:Modem Type.

  • Page 211: Clocking Options

    Chapter 6. CLOCKING AND RX BUFFERING SETTINGS Clocking Options Clocking of the data from the terrestrial equipment to the satellite (and vice versa) will depend on the application. This section describes the most common options and recommended configurations. 6.1.1 EIA-232, EIA-422, or V.35 Master/Master Refer to Figure 6-1 for: •...

  • Page 212: Idr/Ibs G.703 Master/Master

    SDM-300L3 Satellite Modem Revision 1 Clocking Options MN/SDM300L3.IOM The use of loop timing in the modem is an option for both EIA-422 and V.35 operation. SCT (LOOP): SCT (INTERNAL) clock no longer applies when the modem has loop timing on. The TX clock source is now recovered from the RX satellite data. This recovered clock is put out on the ST line and is used to clock the terrestrial equipment.

  • Page 213: D&I G.703 Master/Master

    SDM-300L3 Satellite Modem Revision 1 Clocking Options MN/SDM300L3.IOM The disadvantage of the master/slave application is that the signal received at the slave station is subject to Doppler shift. The length of the buffer at the master end will need to be twice the length that is normally required, compensating for the Doppler shift on the outward and return paths.
  • Page 214 SDM-300L3 Satellite Modem Revision 1 Clocking Options MN/SDM300L3.IOM TXCLOCK = TX TERRESTRIAL HIGH STABILITY OSCILLATOR INTERNAL OSCILLATOR TRANSMIT RECEIVE EXT REF TERRESTRIAL SATELLITE DATA CLOCK BUFFER RECOVERY CLOCK BUFFER CLOCK = TX TERRESTRIAL MASTER BUFFER CLOCK = TX TERRESTRIAL CLOCK...
  • Page 215 SDM-300L3 Satellite Modem Revision 1 Clocking Options MN/SDM300L3.IOM TXCLOCK = TX TERRESTRIAL HIGH STABILITY OSCILLATION TERRESTRIAL INTERNAL OSCILLATOR TRANSMIT RECEIVE EXT REF SATELLITE DATA CLOCK BUFFER RECOVERY CLOCK BUFFER CLOCK = TX TERRESTRIAL MASTER BUFFER CLOCK = RX (SATELLITE CLOCK)
  • Page 216 SDM-300L3 Satellite Modem Revision 1 Clocking Options MN/SDM300L3.IOM TXCLOCK + TX TERRESTRIAL DATA CLOCK RECOVERY CLOCK HIGH STABILITY OSCILLATOR TERRESTRIAL INTERNAL OSCILLATOR TRANSMIT RECEIVE SATELLITE DATA CLOCK DATA BUFFER RECOVERY CLOCK CLOCK BUFFER CLOCK = TX TERRESTRIAL MASTER BUFFER CLOCK = TX TERRESTRIAL...
  • Page 217 SDM-300L3 Satellite Modem Revision 1 Clocking Options MN/SDM300L3.IOM TX CLO CK + TX T ERRES TRIA L DATA CLO CK RECO V ERY CLOCK HIG H STAB ILITY O SCILLATO R TE RRESTRIAL INTERNAL O SCILLATO R BO P TRA NSM IT...
  • Page 218 SDM-300L3 Satellite Modem Revision 1 Clocking Options MN/SDM300L3.IOM T X C L O C K = T X T E R R E S T R IA L S E N D D A T A DROP C L O C K...

  • Page 219: Buffering

    SDM-300L3 Satellite Modem Revision 1 Clocking Options MN/SDM300L3.IOM Buffering The purpose of a receive buffer is two reasons: • Plesiochronous buffering of two dissimilar clock frequencies (normally the far end transmit clock verses the local network clock). The clocks may be very close in frequency to each other and will normally slip at a constant rate.
  • Page 220 SDM-300L3 Satellite Modem Revision 1 Clocking Options MN/SDM300L3.IOM PLESIOCHRONOUS OPERATION IS NOT EXACTLY EQUAL TO f 1) INCOMING TRAFFIC TOO FAST 2) INCOMING TRAFFIC TOO SLOW BIT 1 BIT 1 BIT 1 BIT 1 ERROR ERROR BIT 2 BIT 2...

  • Page 221: Figure 6-7. Doppler Shift

    SDM-300L3 Satellite Modem Revision 1 Clocking Options MN/SDM300L3.IOM SATELLITE MOTION AND ORBITAL INCLINATION A SATELLITE IS MAINTAINED AT AN ASSIGNED GEOSTATIONARY GEO-SYNCHRONOUS LOCATION THROUGH THE USE OF INCLINED ORBIT GROUND COMMAND ADJUSTMENTS TO ITS N/S AND E/W LOCATION. THIS SATELLITE...

  • Page 222: Doppler

    SDM-300L3 Satellite Modem Revision 1 Clocking Options MN/SDM300L3.IOM 6.3.1 Buffer Size The depth of the receive buffer will depend on four parameters: • Doppler shift caused by satellite • Stability of each clock (plesiochronous/Doppler operation) • Frame/Multiframe length of multiplexed data format •...

  • Page 223: Plesiochronous

    SDM-300L3 Satellite Modem Revision 1 Clocking Options MN/SDM300L3.IOM Plesiochronous The stability of station reference clocks is normally 1 x 10 (derived from a cesium standard). While the stability is exceptionally high, the two clocks are not in synchronization with each other and will eventually pass by each other.

  • Page 224: Asymmetrical Loop Timing

    SDM-300L3 Satellite Modem Revision 1 Clocking Options MN/SDM300L3.IOM Asymmetrical Loop Timing Asymmetrical Loop Timing is the same timing method that is designed into the SDM-650B TROJAN interfaces. Refer to Figure 6-8 and Figure 6-9 for TX and RX Asymmetrical Loop Timing block diagram. There are two advantages for using Asymmetrical Loop Timing: •...

  • Page 225: Figure 6-8. Transmit Section Of The Asymmetrical Loop Timing Block Diagram

    SDM-300L3 Satellite Modem Revision 1 Clocking Options MN/SDM300L3.IOM OUTPUT Clock Selection S1 set to: S2 set to: S3 set to: S4 set to: TX TERR (TT) INT (SCT) SCT (INT) EXT REF (See Note 2) SCT (LOOP) EXT REF (See Note 2)

  • Page 226: Figure 6-9. Receive Section Of The Asymmetrical Loop Timing Block Diagram

    SDM-300L3 Satellite Modem Revision 1 Clocking Options MN/SDM300L3.IOM TERR Note: PLL will be bypassed when the RX data rate is set to the TX data rate. This will disable the Asymmetrical Mode. Figure 6-9. Receive Section of the Asymmetrical Loop Timing Block Diagram...

  • Page 227: Frame/Multiframe Length

    SDM-300L3 Satellite Modem Revision 1 Clocking Options MN/SDM300L3.IOM Slave Site: 1. Set Configuration/Interface/Loop Timing to ON. 2. Set Configuration/Interface/TX Clock Source to SCT (LOOP). Or TX Terrestrial, Only if the user equipment can provide the proper slaved clock to the modem.

  • Page 228: Converting Between Bits And Seconds

    SDM-300L3 Satellite Modem Revision 1 Clocking Options MN/SDM300L3.IOM 6.7.3 Converting Between Bits and Seconds 1/Data Rate x Bits = Seconds. Bits to Seconds Data Rate x Seconds = Bit. Seconds to Bits 6–18...

  • Page 229: Chapter 7. Fec And Turbo

    Closed Network compatible with the vast majority of existing modems. THE SDM-300L3 can be fitted with a Turbo Product Codec. Turbo Product Coding is small SIMM module that can be fitted to the unit at time of manufacturing.

  • Page 230: Coding

    7.3.1 Introduction Comtech EF Data implements the FEC Codec based on TPC. A Turbo Product Code is a two dimensional array of block codes. Encoding is relatively straightforward, but decoding is a very complex process requiring multiple iterations of processing for maximum performance to be achieved.

  • Page 231: Mod/Demod Processing Delay

    SDM-300L3 Satellite Modem Revision 1 Forward Error Correction Options MN/SDM300L3.IOM 7.3.2 Mod/Demod Processing Delay In many cases, FEC methods that provide increased coding gain do so at the expense of increased processing delay. However, with TPC, this increase in delay is very modest.

  • Page 232: Comparison Of All Tpc Modes

    529 kHz The occupied bandwidth is defined at the width of the transmitted spectrum taken at the -10 dB points on the plot of power spectral density. This equates to 1.19 x symbol rate for the SDM-300L3 transmit filtering. Included for comparative purposes.

  • Page 233: Uncoded Operation (No Fec)

    There are occasions where a user may wish to operate a satellite link with no forward error correction of any kind. For this reason, the SDM-300L3 offers this uncoded mode for three modulation types - BPSK, QPSK and OQPSK. However, the user should be aware of some of the implications of using this approach.
  • Page 234 The problem becomes progressively better with increasing symbol rate. Comtech EF Data is not responsible for incorrect operation if the user does not adhere to these guidelines when using uncoded operation.

  • Page 235: Figure 7-1. Viterbi Decoder

    SDM-300L3 Satellite Modem Revision 1 Forward Error Correction Options MN/SDM300L3.IOM BPSK/OQPSK Viterbi Decoding 1.0E-02 1.0E-03 Specification Limit Rate 3/4 Coding 1.0E-04 Specification Limit Rate 1/2 Coding 1.0E-05 Specification Limit Rate 7/8 Coding 1.0E-06 Specification Limit 8PSK Rate 2/3 Coding 1.0E-07 1.0E-08...

  • Page 236: Figure 7-2. Viterbi Decoder And Reed-Solomon

    SDM-300L3 Satellite Modem Revision 1 Forward Error Correction Options MN/SDM300L3.IOM BPSK/OQPSK, Viterbi Decoder, Reed Solomon 1.0E-05 1.0E-06 1.0E-07 Specification Limit Rate 8PSK 2/3 1.0E-08 Specification Limit Rate 3/4 Coding Specification Limit 1.0E-09 Rate 7/8 Coding Specification Limit Rate 1/2 Coding 1.0E-10...

  • Page 237: Figure 7-3. Bpsk And (O)Qpsk Ber Performance

    SDM-300L3 Satellite Modem Revision 1 Forward Error Correction Options MN/SDM300L3.IOM UNCODED 1:1 BPSK OQPSK 1.0E-02 1.0E-03 Specification Limit Rate Uncoded 1:1 1.0E-04 1.0E-05 1.0E-06 1.0E-07 10.0 11.0 12.0 Eb/No (dB) Figure 7-3. BPSK and (O)QPSK BER Performance 7–9...

  • Page 238: Figure 7-4. Turbo Product Codec

    SDM-300L3 Satellite Modem Revision 1 Forward Error Correction Options MN/SDM300L3.IOM BPSK/QPSK/8PSK Turbo Product Codec 1.0E-05 1.0E-06 Specification Limit QPSK Rate 1/2 Coding Specification Limit 1.0E-07 8PSK Rate 3/4 Coding 1.0E-08 Specification Limit QPSK Rate 3/4 Coding 1.0E-09 Specification Limit BPSK Rate 21/44 Note: BPSK 5/16 is 1.0E-09 at 4.0...

  • Page 239: Figure 7-5. Sequential Decoder, Reed-Solomon, And 1544 Kbps

    SDM-300L3 Satellite Modem Revision 1 Forward Error Correction Options MN/SDM300L3.IOM Sequential Decoder, Reed-Solomon 1544 Kbps 1.0E-05 1.0E-06 Specification Limit Rate 3/4 Coding 1.0E-07 Specification Limit Specification Limit Rate 1/2 Coding Rate 7/8 Coding 1.0E-08 1.0E-09 1.0E-10 1.0E-11 10.0 11.0 12.0 Eb/No (dB) Figure 7-5.

  • Page 240: Figure 7-6. Sequential Decoder And 56 Kbps

    SDM-300L3 Satellite Modem Revision 1 Forward Error Correction Options MN/SDM300L3.IOM BPSK/OQPSK Sequential Decoder 56 Kbps 1.0E-02 1.0E-03 Specification Limit Rate 7/8 Coding 1.0E-04 Specification Limit 1.0E-05 Specification Limit Rate 1/2 Coding 1.0E-06 1.0E-07 1.0E-08 1.0E-09 10.0 11.0 12.0 Eb/No (dB) Figure 7-6.

  • Page 241: Figure 7-7. Sequential Decoder And 1544 Kbps

    SDM-300L3 Satellite Modem Revision 1 Forward Error Correction Options MN/SDM300L3.IOM BPSK/QPSK Sequential Decoder 1544 Kbps 1.0E-02 Specification Limit Rate 7/8 Coding 1.0E-03 Specification Limit 1.0E-04 Rate 3/4 Coding 1.0E-05 Specification Limit Rate 1/2 Coding 1.0E-06 1.0E-07 1.0E-08 1.0E-09 10.0 11.0 12.0...
  • Page 242 SDM-300L3 Satellite Modem Revision 1 Forward Error Correction Options MN/SDM300L3.IOM This page is intentionally left blank. 7–14...

  • Page 243: Chapter 8. System Checkout

    Chapter 8. SYSTEM CHECKOUT System Checkout This equipment contains parts and assemblies sensitive to damage by ESD. Use ESD precautionary procedures when touching, removing, or inserting PCBs. CAUTION The modem comes equipped with an internal self-test feature. This feature is designed to provide the operator with maximum confidence that the modem is operational without installing external equipment.

  • Page 244: Interface Checkout

    SDM-300L3 Satellite Modem Revision 1 System Checkout MN/SDM300L3.IOM 8.1.1 Interface Checkout Use the following procedure and the test setup in Figure 5-1to inspect the interface. Figure 8-1. Fault Isolation Test Setup 1. Connect a BER test set to the appropriate modem data connector.

  • Page 245: Modulator Checkout

    SDM-300L3 Satellite Modem Revision 1 System Checkout MN/SDM300L3.IOM 8.1.2 Modulator Checkout Use the following procedure to check out the modulator: 1. Set up the equipment as shown in Figure 8-1. 2. Set up the modem for operation by using the Configuration Modulator and Demodulator front panel menus.

  • Page 246: Table 8-1. Conversion To S/N And Eb/N0 Chart

    SDM-300L3 Satellite Modem Revision 1 System Checkout MN/SDM300L3.IOM Table 8-1. Conversion to S/N and Eb/N0 Chart (dB) Code Rate 1/2 Code Rate 3/4 Code Rate 7/8 (S+N)/N E b /N 0 E b /N 0 E b /N 0 -0.6 10.0...

  • Page 247: Demodulator Checkout

    SDM-300L3 Satellite Modem Revision 1 System Checkout MN/SDM300L3.IOM Figure 8-2. Typical Output Spectrum 8.1.3 Demodulator Checkout Use the following procedure to test the demodulator. 1. Set up the equipment. 2. Set up the modem with an external IF loop and level. Use a properly operating modulator, and ensure that power levels, data rates, code rates, etc., are...

  • Page 248: Figure 8-3. Typical Eye Constellations

    SDM-300L3 Satellite Modem Revision 1 System Checkout MN/SDM300L3.IOM WITH NOISE WITHOUT NOISE Figure 8-3. Typical Eye Constellations 8–6...

  • Page 249: Chapter 9. Fault Isolation

    Note: Each fault or alarm category includes possible problems and the appropriate action required to repair the modem. If any of the troubleshooting procedures mentioned earlier in this chapter do not isolate the problem, and Comtech EF Data Customer Support assistance is necessary, have the following information available for the representative: •...

  • Page 250: System Faults/Alarms

    SDM-300L3 Satellite Modem Revision 1 Fault Isolation MN/SDM300L3.IOM 9.1.1 System Faults/Alarms System faults are reported in the “Faults/Alarms ” menu, and stored faults are reported in the “Stored Flts/Alms” menu. 9.1.2 Faults/Alarms Display General fault, status, and alarm information are indicated by 10 LEDs located on the modem’s front panel.

  • Page 251: Figure 9-1. Sdm-300L Fault Tree

    SDM-300L3 Satellite Modem Revision 1 Fault Isolation MN/SDM300L3.IOM 9.1.3.1 Faults Tree Refer to Figure 9-1 for faults monitored by the modem, and the action taken at each occurrence of that fault. & MODULATOR FAULTS IF SYNTHESIZER DATA CLOCK SYN I CHANNEL...
  • Page 252 (IDR ONLY) BW ALARM RX #4 BW ALARM RX #3 BW ALARM RX #2 BW ALARM RX #1 BW ALARM TX #4 BW ALARM TX #3 BW ALARM TX #2 BW ALARM TX #1 Figure 9-1. SDM-300L3 Fault Tree (Continued) 9–4...
  • Page 253 IBS only. D&I only. **** A connection between the common and N.C. contacts indicate fault. ***** Signal is open collector high impedance if faulted. A connection between the common and N.O. contacts indicate alarm. Figure 9-1. SDM-300L3 Fault Tree (Continued) 9–5...

  • Page 254: Modulator Faults

    SDM-300L3 Satellite Modem Revision 1 Fault Isolation MN/SDM300L3.IOM 9.1.3.2 Modulator Faults Fault/Alarm Possible Problem and Action IF SYNTHESIZER Modulator IF synthesizer fault. This is considered a major alarm, and will turn off the modulator output. Return the modem for repair.

  • Page 255: Demodulator Faults

    SDM-300L3 Satellite Modem Revision 1 Fault Isolation MN/SDM300L3.IOM 9.1.3.3 Demodulator Faults Fault/Alarm Possible Problem and Action CARRIER DETECT Carrier detect fault. Indicates the decoder is not locked. This is the most common fault displayed in the modem. Any problem from the input data on the modulator end of the circuit to the output of the decoder can cause this alarm.

  • Page 256: Common Equipment Faults

    TEMPERATURE ODU Temperature fault. PLL LOCK PLL Lock fault. Indicates the PLL is not locked to the reference of the interface transmit clock recovery oscillator. Contact the Comtech EF Data Customer Support Department. CHECKSUM Checksum fault. 9.1.3.5 Common Equipment Faults...
  • Page 257 SDM-300L3 Satellite Modem Revision 1 Fault Isolation MN/SDM300L3.IOM 9.1.3.6 Backward Alarms Faults Fault/Alarm Possible Problem and Action BW ALARM RX4 Receive backward alarm #4. The distant end of the link is sending backward alarm #4. This indicates trouble at the distant end, which may be a result of improper transmission at the near end of the link.
  • Page 258 SDM-300L3 Satellite Modem Revision 1 Fault Isolation MN/SDM300L3.IOM This page is intentionally left blank. 9–10...

  • Page 259: Introduction

    Chapter 10. OPEN NETWORK OPERATIONS 10.1 Introduction This section summarizes the functionality and specifications of the various Open Network operating modes, such as: • • • Drop & Insert (D&I) • 2xADPCM Voice in 64 kbps IBS 10.2 IBS operation adds a proportional overhead (1/15) to the terrestrial data. The terrestrial data and clock are passed through the baseband loopback relay and are translated from the selected baseband format to Transistor-Transistor Logic (TTL).

  • Page 260: Chapter 10. Open Network Operations

    SDM-300L3 Satellite Modem Revision 1 Open Network Operations MN/SDM300L3.IOM The receive data from the demodulator is input through the same interface loopback device. The receive data is demultiplexed and synchronously descrambled by the demultiplexer. The backward alarm is reported to the M&C and output by Form C relay contact.

  • Page 261: Figure 10-1. Ibs Interface Block Diagram

    SDM-300L3 Satellite Modem Revision 1 Open Network Operations MN/SDM300L3.IOM Figure 10-1. IBS Interface Block Diagram 10–3...

  • Page 262: Table 10-1. Ibs Modem Defaults

    SDM-300L3 Satellite Modem Revision 1 Open Network Operations MN/SDM300L3.IOM 10.2.1 IBS Modem Defaults Table 10-1. IBS Modem Defaults Modulator Demodulator Data Rate Data Rate TX Rate A 64 kbps, QPSK 1/2 RX Rate A 64 kbps, QPSK 1/2 TX Rate B...
  • Page 263 SDM-300L3 Satellite Modem Revision 1 Open Network Operations MN/SDM300L3.IOM 10.3 IDR operation adds 96 kbps overhead to the terrestrial data. The terrestrial data rates supported are: • 1.544 Mbps (T1) + 96k = 1640 Mbps on the data rate menu •...
  • Page 264 SDM-300L3 Satellite Modem Revision 1 Open Network Operations MN/SDM300L3.IOM The receive data and selected clock are translated to conform to the G.703 interface, and output through the baseband loopback relay. Four sets of transmit and receive backward alarms are available to implement the structure defined in IESS-308.

  • Page 265: Figure 10-2. Idr Interface Block Diagram

    SDM-300L3 Satellite Modem Revision 1 Open Network Operations MN/SDM300L3.IOM Figure 10-2. IDR Interface Block Diagram 10–7...

  • Page 266: Table 10-2. Idr Modem Defaults

    SDM-300L3 Satellite Modem Revision 1 Open Network Operations MN/SDM300L3.IOM 10.3.1 IDR Modem Defaults Table 10-2. IDR Modem Defaults Modulator Demodulator Data Rate Data Rate TX Rate A 1640 kbps, QPSK 3/4 RX Rate A 1640 kbps, QPSK 3/4 TX Rate B...

  • Page 267: Drop & Insert (D&I)

    The satellite overhead includes an ESC. Use of this channel is not specified by IESS and IESS-309. Comtech EF Data uses the ESC to implement a sampled EIA-232 data link, which works at data rates up to 1/2000 of the satellite rate.

  • Page 268: Figure 10-3. D&I With Asynchronous Overhead Data Flow

    SDM-300L3 Satellite Modem Revision 1 Open Network Operations MN/SDM300L3.IOM Figure 10-3. D&I with Asynchronous Overhead Data Flow 10–10...

  • Page 269: Description Of D&I Operation

    SDM-300L3 Satellite Modem Revision 1 Open Network Operations MN/SDM300L3.IOM 10.4.1 Description of D&I Operation The main features of the D&I option are as follows: • Data interface • Transmit MUX • Receive DEMUX • • Backward Alarm 10.4.1.1 Data Interface Data interface contains transformer balanced data interfaces that support CCITT G.703...

  • Page 270: Plesiochronous Buffer

    SDM-300L3 Satellite Modem Revision 1 Open Network Operations MN/SDM300L3.IOM The transmit data will be replaced with an all 1s pattern (AIS) in the event of certain failures, in accordance with IESS-308. As a test mode, the transmit data can be replaced with a 2047 pattern.

  • Page 271: Backward Alarm

    SDM-300L3 Satellite Modem Revision 1 Open Network Operations MN/SDM300L3.IOM The operator may select from four other clock sources as a backup: • Insert clock (D&I mode only) • RX satellite • Internal clock source • TX terrestrial Problems occurring on any of the selected clocks will cause the modem to substitute the satellite clock and a fault will be signaled.

  • Page 272: D&I Framing Formats

    SDM-300L3 Satellite Modem Revision 1 Open Network Operations MN/SDM300L3.IOM 10.4.2 D&I Framing Formats The D&I framing formats used in the modem can be divided into T1 and E1 categories, as follows: T1_ESF T1 Extended Super Frame T1 D4 Framing T1 Extended Super Frame Special...

  • Page 273: Figure 10-4. E1 Framing Formats

    SDM-300L3 Satellite Modem Revision 1 Open Network Operations MN/SDM300L3.IOM Figure 10-4. E1 Framing Formats 10–15...

  • Page 274: Figure 10-5. T1 Framing Formats

    SDM-300L3 Satellite Modem Revision 1 Open Network Operations MN/SDM300L3.IOM Figure 10-5. T1 Framing Formats 10–16...

  • Page 275: Table 10-3. D&I Modem Faults

    SDM-300L3 Satellite Modem Revision 1 Open Network Operations MN/SDM300L3.IOM 10.4.3 D&I Modem Defaults Table 10-3 . D&I Modem Faults Modulator Demodulator Data Rate Data Rate TX Rate A 64 kbps, QPSK 1/2 RX Rate A 64 kbps, QPSK 1/2 TX Rate B...

  • Page 276: Xadpcm Voice In 64 Kbps Ibs

    SDM-300L3 Satellite Modem Revision 1 Open Network Operations MN/SDM300L3.IOM 10.5 2xADPCM Voice in 64 kbps IBS 2xADPCM Voice in 64 kbps IBS operation is an optional feature available with the IBS option or the IDR option. This mode is a hybrid cross between IDR and IBS where the two 32 kbps ADPCM voice channels that are part of the IDR ESC circuits are mapped into a single 64 kbps IBS channel to provide two full-duplex voice channels.

  • Page 277: Chapter 11. Asynchronous Interface/Aupc

    Chapter 11. ASYNCHRONOUS INTERFACE/AUPC 11.1 Asynchronous Interface/AUPC The asynchronous (ASYNC) interface option provides the interface for terrestrial data and a single ASYNC overhead channel. Typically used for earth-station-to-earth-station communication, the overhead channel is MUXed onto the data and transmitted at an overhead rate of 16/15 of the main channel.
  • Page 278 1.875 of the synchronous data rate. Note: The asynchronous overhead structure is an Comtech EF Data standard, and is not compatible with IBS or IDR overhead formats. The ASYNC interface PCB also provides its own Doppler buffer, which has a maximum depth of 32 ms at the highest terrestrial data rate.

  • Page 279: Figure 11-1. Async/Aupc Block Diagram

    SDM-300L3 Satellite Modem Revision 1 Asynchronous Interface/AUPC MN/SDM300L3.IOM AUPC DATA FROM M&C G.703 TERR DATA INPUT EIA-422 FIFO TERR CLOCK TERR DATA V.35 TERR OVERHEAD CLOCK INTERFACE CNT SIGNALS INTERFACE CNT SIGNALS ASYNC DATA EIA-485 UART ASYNC DATA EIA-232 M&C CONTROL AUPC DATA TO M&C...

  • Page 280: Aupc

    SDM-300L3 Satellite Modem Revision 1 Asynchronous Interface/AUPC MN/SDM300L3.IOM 11.2 AUPC There are two modes of AUPC location: AUPC between two modems Maintains a target Eb/No programmed into the modem at each end. Self-Monitoring AUPC with one Maintains a target Eb/No for a modem that receives its own carrier modem from the satellite.

  • Page 281: Aupc – Between Two Modems

    SDM-300L3 Satellite Modem Revision 1 Asynchronous Interface/AUPC MN/SDM300L3.IOM With Local AUPC On, set modems (A and B), if modem A loses carrier: 1. Modem A sets its output power (MAXIMUM, MINIMUM, OR HOLD) as specified by LOCAL CL ACTION. 2. Modem A then sends a “lost carrier” command to modem B.

  • Page 282: Self-Monitoring Local Modem Aupc Control

    SDM-300L3 Satellite Modem Revision 1 Asynchronous Interface/AUPC MN/SDM300L3.IOM 11.2.1.1 Remote AUPC This feature allows the user to monitor and control a remote modem location using the front panel or serial port of the local modem. The operator can set or reset the following commands: •...

  • Page 283: Terrestrial Data Interfaces

    MN/SDM300L3.IOM Notes: 1. Comtech EF Data does not recommend increasing the power to the satellite without consulting with the satellite controller. 2. Be careful not to set carrier output too high when there is a loss of carrier due to severe weather and the CL loss action is set to Maximum.

  • Page 284: Mux Operation

    SDM-300L3 Satellite Modem Revision 1 Asynchronous Interface/AUPC MN/SDM300L3.IOM 11.3.3 MUX Operation The MUX receives terrestrial and ASYNC data from the selected receivers. The terrestrial data flows into a small “First In/First Out” (FIFO) buffer. The FIFO buffer aids in the rate exchange between the terrestrial data rate and the overhead rate. The terrestrial clock or an internal clock can clock the data into the MUX.

  • Page 285: Loop Timing Operation

    SDM-300L3 Satellite Modem Revision 1 Asynchronous Interface/AUPC MN/SDM300L3.IOM The Doppler buffer receives data clocked by the overhead clock from the Demod and an enable line from the DEMUX. The data is stored in RAM. Four options are allowed to clock the data out of the buffer: •...

  • Page 286: Non-Async Operation

    SDM-300L3 Satellite Modem Revision 1 Asynchronous Interface/AUPC MN/SDM300L3.IOM 11.3.8 Non-ASYNC Operation The ASYNC interface has pass-through capability. If ASYNC is turned off in the Configuration Interface menu, then a standard G.703, EIA-422, or V.35 interface is selected. The modem will operate as a standard G.703, EIA-422, or V.35 interface with no overhead.

  • Page 287: Valid Async Baud Rates

    SDM-300L3 Satellite Modem Revision 1 Asynchronous Interface/AUPC MN/SDM300L3.IOM 11.4.1 Valid ASYNC Baud Rates The ASYNC baud rates are limited by the terrestrial data rates. The following table shows the relationships between data and baud rates. If DR ≤ 15.999K Maximum baud rate is 150 If DR ≤...

  • Page 288: Async Remote Operation

    SDM-300L3 Satellite Modem Revision 1 Asynchronous Interface/AUPC MN/SDM300L3.IOM 11.4.3 ASYNC Remote Operation Remote modems can be controlled over the ASYNC channel from the local (or “hub”) modem. Refer to Table 11-2 for a list of combinations: Table 11-2. ASYNC R...

  • Page 289: Figure 11-3. Remote Async Connection Diagram For Breakout Panel

    SDM-300L3 Satellite Modem Revision 1 Asynchronous Interface/AUPC MN/SDM300L3.IOM WYSE REMOTE TERMINAL (OR EQUIVALENT) V.35 V.35 DATA DATA CONNECTOR CONNECTOR EIA-485 25-PIN CONNECTOR 25-PIN 25-PIN LOCAL EIA-485 9-PIN CONNECTOR REMOTE EIA-485 ASYNC ASYNC (4-WIRE) (INDUSTRY STANDARD) (4-WIRE) CONNECTOR CONNECTOR CABLE CABLE...

  • Page 290: Table 11-3. Local Eia-232 To Remote Eia-232

    SDM-300L3 Satellite Modem Revision 1 Asynchronous Interface/AUPC MN/SDM300L3.IOM 11.4.3.1 Configuration #1 (Local EIA-232 to Remote EIA-232) Table 11-3. Local EIA-232 to Remote EIA-232 #1. Local End Modem Settings for EIA-232 Utility Interface Menu ASYNC TX and RX Type EIA-232 Configuration Interface Menu...

  • Page 291: Table 11-4. Local Eia-232 To Remote Eia-485 (4-Wire)

    SDM-300L3 Satellite Modem Revision 1 Asynchronous Interface/AUPC MN/SDM300L3.IOM 11.4.3.2 Configuration #2 (Local EIA-232 to Remote EIA-485 [4-Wire]) Table 11-4. Local EIA-232 to Remote EIA-485 (4-Wire) #2. Local End Modem Settings for EIA-232 (4-Wire) Utility Interface Menu ASYNC TX and RX Type...

  • Page 292: Table 11-5. Local Eia-232 To Remote Eia-485 (2-Wire)

    SDM-300L3 Satellite Modem Revision 1 Asynchronous Interface/AUPC MN/SDM300L3.IOM 11.4.3.3 Configuration #3 (Local EIA-232 to Remote EIA-485 [2-Wire]) Table 11-5. Local EIA-232 to Remote EIA-485 (2-Wire) #3. Local End Modem Settings for EIA-232 Utility Interface Menu ASYNC TX and RX Type...

  • Page 293: Table 11-6. Local Eia-485 (4-Wire) To Remote Eia-232

    SDM-300L3 Satellite Modem Revision 1 Asynchronous Interface/AUPC MN/SDM300L3.IOM 11.4.3.4 Configuration #4 (Local EIA-485 [4-Wire] to Remote EIA-232) Table 11-6. Local EIA-485 (4-Wire) to Remote EIA-232 #4. Local End Modem Settings for EIA-485 (4-Wire) Utility Interface Menu ASYNC TX and RX Type...

  • Page 294: Table 11-7. Local Eia-485 (4-Wire) To Remote Eia-485 (4-Wire)

    SDM-300L3 Satellite Modem Revision 1 Asynchronous Interface/AUPC MN/SDM300L3.IOM 11.4.3.5 Configuration #5 (Local EIA-485 [4-Wire] to Remote EIA-485 [4-Wire]) Table 11-7. Local EIA-485 (4-Wire) to Remote EIA-485 (4-Wire) #5. Local End Modem Settings for EIA-485 (4-Wire) Utility Interface Menu ASYNC TX and RX Type...

  • Page 295: Table 11-8. Local Eia-485 (4-Wire) To Remote Eia-485 (2-Wire)

    SDM-300L3 Satellite Modem Revision 1 Asynchronous Interface/AUPC MN/SDM300L3.IOM 11.4.3.6 Configuration #6 (Local EIA-485 [4-Wire] to Remote EIA-485 [2-Wire]) Table 11-8. Local EIA-485 (4-Wire) to Remote EIA-485 (2-Wire) #6. Local End Modem Settings for EIA-485 (4-Wire) Utility Interface Menu ASYNC TX and RX Type...

  • Page 296: Table 11-9. Local Eia-485 (2-Wire) To Remote Eia-232

    SDM-300L3 Satellite Modem Revision 1 Asynchronous Interface/AUPC MN/SDM300L3.IOM 11.4.3.7 Configuration #7 (Local EIA-485 [2-Wire] to Remote EIA-232) Table 11-9. Local EIA-485 (2-Wire) to Remote EIA-232 #7. Local End Modem Settings for EIA-485 (2-Wire) Utility Interface Menu ASYNC TX and RX Type...
  • Page 297 SDM-300L3 Satellite Modem Revision 1 Asynchronous Interface/AUPC MN/SDM300L3.IOM The local end cable connects the 25-pin female ASYNC connector (on either the breakout panel or the Y cable) to the EIA-485 (2-wire) remote terminal (WYSE or laptop computer). The pinout of the local cable is listed in the following table.

  • Page 298: Table 11-10. Local Eia-485 (2-Wire) To Remote Eia-485 (4-Wire)

    SDM-300L3 Satellite Modem Revision 1 Asynchronous Interface/AUPC MN/SDM300L3.IOM 11.4.3.8 Configuration #8 (Local EIA-485 [2-Wire] to Remote EIA-485 [4-Wire]) Table 11-10. Local EIA-485 (2-Wire) to Remote EIA-485 (4-Wire) #8. Local End Modem Settings for EIA-485 (2-Wire) Utility Interface MENU ASYNC TX and RX Type...
  • Page 299 SDM-300L3 Satellite Modem Revision 1 Asynchronous Interface/AUPC MN/SDM300L3.IOM The local end cable connects the 25-pin female ASYNC connector (on either the breakout panel or the Y cable) to the EIA-485 (2-wire) remote terminal (WYSE or laptop computer). The pinout of the local cable is listed in the following table.

  • Page 300: Table 11-11. Async/Aupc Modem Defaults

    SDM-300L3 Satellite Modem Revision 1 Asynchronous Interface/AUPC MN/SDM300L3.IOM 11.4.4 ASYNC/AUPC Modem Defaults Table 11-11. ASYNC/AUPC Modem Defaults Modulator Demodulator Data Rate Data Rate TX Rate A 64 kbps, QPSK 1/2 RX Rate A 64 kbps, QPSK 1/2 TX Rate B...

  • Page 301: Chapter 12. G.703

    Chapter 12. G.703 12.1 G.703 G.703 data is either in AMI, B8ZS (8 zero) suppression, or HDB3 (3 zero) suppression formats. There is not a coexisting clock that is on a separate line for G.703 data. The clock is derived from the data stream within the modem and in the user equipment. Loop timing, if desired, must occur in the customer equipment for the link to operate in Master/Slave.
  • Page 302 SDM-300L3 Satellite Modem Revision 1 G.703 MN/SDM300L3.IOM This page is intentionally left blank. 12–2...

  • Page 303: Fast System Theory

    The access code can be purchased at any time from Comtech EF Data. Once obtained, the access code is loaded into the unit through the front panel keyboard or the rear remote port.

  • Page 304: Activation Procedure

    SDM-300L3 Satellite Modem Revision 1 Options MN/SDM300L3.IOM 13.1.1.1 Activation Procedure Obtain Modem Serial Number 1. Press [CLEAR] to return to the Main menu. 2. Use [←] and [→] to select Function Select menu. 3. Press [ENTER]. 4. Use [←] and [→] to select Utility Modem Type menu.
  • Page 305 8. Record Card #2 serial number, if displayed: 9. Press [CLEAR]. 10. Contact a Comtech EF Data sales representative to order features. 11. Comtech EF Data Customer Support personnel will verify the order and provide an invoice and instructions. Entering Access Codes from the Front Panel 1.
  • Page 306 “+” sign. If a “+” sign is evident, the upgrade is completed. If upgrade is incorrect, the menu display will exhibit “WRONG CODE ENTERED.” Repeat procedures. Contact Comtech EF Data Customer Support personnel for further instructions, if the error message remains.

  • Page 307: Chapter 14. Specifications

    CHAPTER 14 . SPECIFICATIONS 14.1 Specifications The SDM-300L3 satellite modem specifications are divided into sections as follows. • Specifications Summary • BER Specifications • Modem Specifications • Demodulator Specifications • Interface Specifications • Terrestrial Interface Types • System Specifications •...

  • Page 308: Figure 14-1. Block Diagram

    SDM-300L3 Satellite Modem Revision 0 Specifications MN/SDM300L3.IOM AC Or (Optional) Optional Breakout Panel Power AC Only Opt ODU Power Opt ODU Ref Osc Ref Osc UB-530 Supply Supply Supply Supply Prime Power Tx Data Ext Ref Tx Clock Encoder /...

  • Page 309: Specification Summary

    Modulation/Demodulation BPSK QPSK OQPSK 8-PSK Baseband Filtering IESS, Comtech EF Data Closed, Comstream Closed, EFD Closed Forward Error Correction (FEC) Viterbi, K=7, 1/2, 3/4, 7/8 rates Sequential 1/2, 3/4, 7/8 rates Reed-Solomon Concatenated per Intelsat Reed-Solomon Concatenated per closed network...

  • Page 310: L-Band Modulator Specification Summary

    SDM-300L3 Satellite Modem Revision 0 Specifications MN/SDM300L3.IOM 14.3 L-Band Modulator Specification Summary Table 14-2. L-Band Modulator Transmit Specifications Output Connector Type N Female Frequency Stability ± 0.02 ppm Optional: ± 1.0 ppm Output Power Range 0 to -40 dBm in 0.1 dB steps ±...

  • Page 311: Demodulator Specification Summary

    SDM-300L3 Satellite Modem Revision 0 Specifications MN/SDM300L3.IOM 14.4 Demodulator Specification Summary Table 14-3. Demodulator Specification Receive Specifications Input Connector Type F Female Input Impedance 75 Ω ≥ 10 dB Input Return Loss Minimum Input Level, Desired Carrier -135 dBm + 10*Log (Symbol Rate), see curve...

  • Page 312: L-Band Modulator Specifications

    SDM-300L3 Satellite Modem Revision 0 Specifications MN/SDM300L3.IOM 14.5 L-Band Modulator Specifications 14.5.1 Digital Data Rate The digital data rate is selectable in 1 bit/s steps. The modem automatically calculates and sets the symbol rate. Data rates entered that exceed the data rate or symbol rate specification are rejected at entry.
  • Page 313 SDM-300L3 Satellite Modem Revision 0 Specifications MN/SDM300L3.IOM Table 14-4. Modulator Digital Data Rates (Continued) Modulation Type Encoding Type Data Rate Range BPSK 1/2 ASYNC 2.4 kbps 1024 kbps QPSK 1/2, 3/4 64 kbps 2048 kbps QPSK 1/2, 3/4 D&I 64 kbps...

  • Page 314: Modulation And Encoding Types

    SDM-300L3 Satellite Modem Revision 0 Specifications MN/SDM300L3.IOM 14.5.2 Modulation and Encoding Types The following combinations of modulation and forward error correction encoding are available. Table 14-5. Modulation and Encoding Types Encoder Code Rate Reed-Solomon Modulation Viterbi, K7 BPSK Viterbi, K7...

  • Page 315: Scrambling Types

    SDM-300L3 Satellite Modem Revision 0 Specifications MN/SDM300L3.IOM 14.5.3 Scrambling Types When scrambling is enabled, it is applied to the modulator data according to the programmed modulator type as listed in the following table. When scrambling is disabled, no scrambling is applied to the modulator data.

  • Page 316: Modulator Spurious Emissions

    SDM-300L3 Satellite Modem Revision 0 Specifications MN/SDM300L3.IOM 14.5.5 Modulator Spurious Emissions Spurious emissions are measured relative to the power of an unmodulated carrier. The measurement is done with the carrier on in continuous mode and modulated by the correct data/clock signal. Spurious emissions measured in a 4 kHz bandwidth at the TX IF output are –55 dBc from 55 MHz to 2 GHz.

  • Page 317: Differential Encoder

    SDM-300L3 Satellite Modem Revision 0 Specifications MN/SDM300L3.IOM 14.5.9 Differential Encoder The differential encoder takes care of one set of ambiguities due to the error correction codes being transparent. • On or off 14.5.10 BPSK Bit Ordering The encoder has the ability to select whether I is the first bit or Q is the first bit in the symbol word grouping for compatibility with any system.

  • Page 318: Modulator Power Offset

    SDM-300L3 Satellite Modem Revision 0 Specifications MN/SDM300L3.IOM 14.5.16 Modulator Power Offset An offset to the displayed IF output power may be entered from -99.0 to +99.0 dB, in 0.1 dB steps. 14.5.17 Modulator I / Q Imbalance • The modulator will have less than 4° RMS phase error.

  • Page 319: L-Band Odu Supply Voltage

    SDM-300L3 Satellite Modem Revision 0 Specifications MN/SDM300L3.IOM 14.5.24 L-Band ODU Supply Voltage Standard configuration is without a power supply for the external ODU or outdoor unit. Two power options are available: • 24V at 100W • 48V at 150W During power up of the modem, the ODU supply voltage initially powers up in the OFF condition.

  • Page 320: Oqpsk Encoding

    SDM-300L3 Satellite Modem Revision 0 Specifications MN/SDM300L3.IOM Using vector analysis of the constellation pattern, QPSK represents a symbol with the carrier phase angle at 45°, 135°, 225°, or 315°. The 1/2, 3/4, and 7/8 rates encoded provide the desired input/output bit rates.

  • Page 321: L-Band Demodulator Specifications

    SDM-300L3 Satellite Modem Revision 0 Specifications MN/SDM300L3.IOM 14.7 L-Band Demodulator Specifications 14.7.1 Digital Data Rate The digital data rate is selectable in 1 bit/s steps. The modem automatically calculates and sets the symbol rate. Data rates entered that exceed the data rate or symbol rate specification are rejected at entry.
  • Page 322 SDM-300L3 Satellite Modem Revision 0 Specifications MN/SDM300L3.IOM Table 14-7. Demodulator Digital Data Rate (Continued) Modulation Type Encoding Type Data Rate Range BPSK 1/2 ASYNC 2.4 kbps 1024 kbps QPSK 1/2, 3/4 64 kbps 2048 kbps QPSK 1/2, 3/4 D&I 64 kbps...

  • Page 323: Demodulation And Fec Decoding Types

    SDM-300L3 Satellite Modem Revision 0 Specifications MN/SDM300L3.IOM 14.7.2 Demodulation and FEC Decoding Types The following combinations of demodulation and forward error correction decoding are available. Table 14-8. L-Band Demodulation and FEC Decoding Types Decoder Code Rate Reed Solomon Modulation Viterbi, K7...

  • Page 324: Descrambling Types

    SDM-300L3 Satellite Modem Revision 0 Specifications MN/SDM300L3.IOM 14.7.3 Descrambling Types When descrambling is enabled, it is applied to the demodulator data according to the programmed demodulator type as listed in Table 14-9. When descrambling is disabled, no descrambling is applied to the demodulator data.

  • Page 325: Demodulator Spectrum Rotation

    SDM-300L3 Satellite Modem Revision 0 Specifications MN/SDM300L3.IOM 14.7.7 Demodulator Spectrum Rotation The operator can select Normal, Inverted, or Auto-Detect of the spectrum for the Demodulator Input. 14.7.8 Receive Frequency The range of the input spectrum is from 950 to 1750 MHz, in 100 Hz steps.

  • Page 326: Receive Input Power (Composite)

    The sum of all carriers is ≤ +50 dBc with respect to the desired carrier for symbol rates ≥ 64 Ks/s. 14.7.15 Demodulator Input Shape The modem can be set to match any of the following spectral mask specifications. • Closed net (Comtech EF Data) • Closed net (Comstream) • Closed net (Fairchild compatible) 14–20...

  • Page 327: Receive Input Power (Desired Carrier)

    SDM-300L3 Satellite Modem Revision 0 Specifications MN/SDM300L3.IOM 14.7.16 Receive Input Power (Desired Carrier) The modem can meet the specified BER and automatically adjust to a receive input power. The minimum input signal level is –135 dBm + 10 log (Symbol Rate). E.g. (-98 dBm @ 4.8 Ks/s).

  • Page 328: Bit Error Rate Performance

    SDM-300L3 Satellite Modem Revision 0 Specifications MN/SDM300L3.IOM 14.8 Bit Error Rate Performance 14.8.1 Performance With Noise, Viterbi Decoder, and Closed Network Required Eb/No BPSK and {O}QPSK 1/2 Rate 3/4 Rate 7/8 Rate 2/3 8-PSK 10 -3 10 -4 10 -5...

  • Page 329: Performance With Noise Turbo Product Codec (Optional)

    SDM-300L3 Satellite Modem Revision 0 Specifications MN/SDM300L3.IOM 14.8.4 Performance with Noise Turbo Product Codec (Optional) Required Eb/No QPSK BPSK 8-PSK 1/2 Rate 3/4 Rate 21/44 Rate 5/16 Rate 3/4 Rate 10 -6 10 -7 10 -8 * 5/16 BPSK included for compatibility with other equipment but implementation limitations prohibit optimum performance at low Eb/No.

  • Page 330: Performance With Noise, 1544 Kbps Sequential Decoder (Optional)

    SDM-300L3 Satellite Modem Revision 0 Specifications MN/SDM300L3.IOM 14.8.7 Performance With Noise, 1544 kbps Sequential Decoder (Optional) Required Eb/No BPSK and QPSK 1/2 Rate 3/4 Rate 7/8 Rate 10 -3 10 -4 10 -5 10 -6 10 -7 10 -8 Note: OQPSK with Sequential is not available.

  • Page 331: Acquisition Time

    SDM-300L3 Satellite Modem Revision 0 Specifications MN/SDM300L3.IOM 14.9 Acquisition Time The acquisition times apply for QPSK only. Viterbi 6 dB E b /N 0 with ± 35 kHz Frequency Uncertainty Code Rate Data Rate T acq P (t < T acq ) <...

  • Page 332: Receive Carrier Acquisition Range

    SDM-300L3 Satellite Modem Revision 0 Specifications MN/SDM300L3.IOM 14.9.1 Receive Carrier Acquisition Range 1. The modem will automatically lock to a correctly formatted carrier, which is within Acquisition Range of the displayed RX frequency. 2. The operator can adjust the acquisition range from 0 to 1 MHz, in 1 Hz steps.

  • Page 333: Interface Specifications

    SDM-300L3 Satellite Modem Revision 0 Specifications MN/SDM300L3.IOM 14.10 Interface Specifications 14.10.1 TX Clock Switching Due to Failure of Selected Clock The modem will automatically switch the TX clock source to SCT internal on failure of terminal timing. 14.10.2 TX Clock Phase Adjustment The operator can set the TX clock phase to Normal, Inverted, or Auto Mode.

  • Page 334: Doppler/Plesiochronous Buffer Clock Source

    SDM-300L3 Satellite Modem Revision 0 Specifications MN/SDM300L3.IOM 14.10.6 Doppler/Plesiochronous Buffer Clock Source The operator from the following sources can select the Doppler/Plesiochronous buffer clock reference. • The RX satellite clock (Bypass Mode). • The TX terrestrial clock (TT). Must be within ± 100 PPM of the nominal receive data rate.

  • Page 335: Receive Doppler/Plesiochronous Buffer Size

    SDM-300L3 Satellite Modem Revision 0 Specifications MN/SDM300L3.IOM 14.10.12 Receive Doppler/Plesiochronous Buffer Size The receive Doppler buffer size can be set by the operator from: 1. Bypass. 2. 32 to 262144 bits, in 16 bit steps for all data rates. 3. Selectable in ms, from 1 to 99 in 1 ms steps, for data rates < 2.6 Mbps.

  • Page 336: Oqpsk Decoding (Optional)

    SDM-300L3 Satellite Modem Revision 0 Specifications MN/SDM300L3.IOM Using vector analysis of the constellation pattern, QPSK represents a symbol with the carrier phase angle at 45°, 135°, 225°, or 315°. The 1/2, 3/4, and 7/8 rates provide the desired input/output bit rates.

  • Page 337: Terrestrial Interface Types

    SDM-300L3 Satellite Modem Revision 0 Specifications MN/SDM300L3.IOM 14.12 Terrestrial Interface Types The following interface types are available with electrical properties indicated in the following subsections: Modem Configuration EIA-232 EIA-422/ V.35 Overhead G.703 EIA-449 25-pin Connector 34-pin Connector 37-pin Connector 50-pin Connector (W/Overhead...

  • Page 338: V.35 Specification V.10, V.11 Specification, Circuit Supported

    SDM-300L3 Satellite Modem Revision 0 Specifications MN/SDM300L3.IOM 14.12.2 V.35 Specification V.10, V.11 Specification, Circuit Supported Circuit Supported SD, SCT, SCTE, RD, SCR, DSR, RLSD, RTS, CTS, MC, DSR, LL Driver Amplitude (RD, SCR, SCTE, CTS, ± 0.5V-PK, ± 20% differential, into 100Ω...

  • Page 339: Eia-449/Eia-422 Mil-188-114A Specification

    SDM-300L3 Satellite Modem Revision 0 Specifications MN/SDM300L3.IOM 14.12.3 EIA-449/EIA-422 Mil-188-114A Specification Circuit Supported SD, ST, TT, RD, RT, DM, RR, RS, CS, MC ≥ ± 2V differential into 100Ω Amplitude (RD, RT, ST, DM, RR) Impedance (RD, RT, ST, DM, RR) <...

  • Page 340: Asynchronous Overhead Specification (Optional)

    SDM-300L3 Satellite Modem Revision 0 Specifications MN/SDM300L3.IOM 14.13 Asynchronous Overhead Specification (Optional) The operator can select EIA-232 or EIA-485 for both the transmit and receive asynchronous overhead data type. Primary Data Rates Supported G.703 1544 kbps SD, RD 2048 kbps SD, RD EIA-422 9.6 kbps to 2.048 Mbps...

  • Page 341: Asynchronous Baud Rates

    SDM-300L3 Satellite Modem Revision 0 Specifications MN/SDM300L3.IOM 14.13.1 Asynchronous Baud Rates The operator can select the following baud rates for both the TX and RX asynchronous overhead. 2400 4800 9600 19200 1200 38400 14.13.2 Asynchronous Overhead Data Format The operator can select the following data formats for both the TX and RX asynchronous overhead.

  • Page 342: Turbo Aupc

    SDM-300L3 Satellite Modem Revision 0 Specifications MN/SDM300L3.IOM 14.13.5 Turbo AUPC Self monitoring AUPC is provided. 14.14 IBS (Optional with Overhead Card) Primary Data Rates Supported G.703 1544 kbps SD, RD 2048 kbps SD, RD EIA-422 N x 64 kbps SD, RD (up to 2048 kbps) V.35...

  • Page 343: Ibs Engineering Service Channel

    SDM-300L3 Satellite Modem Revision 0 Specifications MN/SDM300L3.IOM 14.14.4 IBS Engineering Service Channel Bi-directional processing of the components of the ESC channel, including the asynchronous or synchronous EIA-232 data channel, and fault/alarm indications. 14.14.5 IBS Scrambling Provides the synchronous scrambling/descrambling of the satellite-framed data specified in IESS-309.

  • Page 344: D&I Primary Data Interfaces

    SDM-300L3 Satellite Modem Revision 0 Specifications MN/SDM300L3.IOM 14.15.1 D&I Primary Data Interfaces When configured for D&I operation, multiplexing/demultiplexing follows the IBS satellite frame structure and ESC features, but with the following changes: • Accepts and outputs primary data through the 50-pin connector using G.703. The data rate must be at T1 or E1 rates only.

  • Page 345: Idr Primary Data Interfaces

    SDM-300L3 Satellite Modem Revision 0 Specifications MN/SDM300L3.IOM 14.16.1 IDR Primary Data Interfaces When configured for IDR operation, the board performs these functions: • Receives and performs clock and data recovery on incoming G.703 T1 and E1 pseudo-ternary data. • Clock dejitter is performed per G.823 and G.824, and any data decoding (AMI, B8Z5, or HDB3) required per G.703 is also done.

  • Page 346: System Specifications

    SDM-300L3 Satellite Modem Revision 0 Specifications MN/SDM300L3.IOM 14.17 System Specifications 14.17.1 Loopback Modes The operator can select one of the following interface loopback test modes. • Baseband: Near end and far end. • Interface: Near end and far end (Reed-Solomon or Overhead only).

  • Page 347: Remote Control

    SDM-300L3 Satellite Modem Revision 0 Specifications MN/SDM300L3.IOM 14.17.3 Remote Control All modem functions can be controlled remotely through the remote connector on the rear panel. See the Remote Specification for the complete command and response structures and syntax. Interface type: •...

  • Page 348: Stored Faults

    SDM-300L3 Satellite Modem Revision 0 Specifications MN/SDM300L3.IOM 14.18 Stored Faults All faults listed above will be stored in battery backed memory for up to 10 occurrences of each fault, along with the time and date of when the fault occurred, and, where applicable, when it cleared.

  • Page 349: Chapter 15. Buc Fsk Communications

    Chapter 15. BUC FSK COMMUNICATIONS 15.1 Introduction The modulator includes capability to communicate with an ODU Block Up Converter (BUC) using an FSK signal multiplexed onto the IF output connector along with the TX IF signal, 10 MHX reference, and DC power to the BUC. The M&C implements commands to control BUC functions and to query the BUC for configuration or status information.

  • Page 350: Message Structure

    SDM-300L3 Satellite Modem Revision 1 BUC FSK Communications MN/SDM300L3.IOM On power-up, the TX carrier is Off until the BUC is commanded to turn the carrier on (unless the unit is commanded into the power On mode at the factory). The BUC does not allow the carrier to be turned On unless the PLL is locked, and automatically turns the carrier Off in the event the PLL goes out-of-lock.

  • Page 351: Response Message Structure (Buc To Idu)

    SDM-300L3 Satellite Modem Revision 1 BUC FSK Communications MN/SDM300L3.IOM 15.2.2 Response Message Structure (BUC to IDU) Byte Name Description Value Address Address of BUC shifted left by 4 0x10 to 0xf0 Level Byte 1 MSbyte of TX output power Level Byte 2...
  • Page 352 SDM-300L3 Satellite Modem Revision 1 BUC FSK Communications MN/SDM300L3.IOM This page is intentionally left blank. 15–4...
  • Page 353 Appendix A. REMOTE CONTROL OPERATION This appendix describes the remote control operation of the SDM-300L3. Firmware number: FW/8460-1AD Software version: 2.2.1 Note: The firmware referenced in this manual may be an earlier version of the actual firmware supplied with the unit.
  • Page 354 SDM-300L3 Satellite Modem Revision 1 Remote Control Operation MN/SDM300L3.IOM Message Structure The ASCII character format used requires 11 bits/character: • 1 start bit • Information and Parity bits (select one) • 7 information bits and 1 parity bit (Odd/Even) or 8 information bits (None) •...
  • Page 355 SDM-300L3 Satellite Modem Revision 1 Remote Control Operation MN/SDM300L3.IOM A.2.3 Command/Response The command/response portion of the message contains a variable-length character sequence which conveys command and response data. If a satellite modem receives a message addressed to it which does not match the established protocol or cannot be implemented, a negative acknowledgment message is sent in response.
  • Page 356 SDM-300L3 Satellite Modem Revision 1 Remote Control Operation MN/SDM300L3.IOM A.2.4 End Character Each message is ended with a single character which signals the end of the message: “cr” Carriage return character for commands “]” End bracket for responses A–4...
  • Page 357 SDM-300L3 Satellite Modem Revision 1 Remote Control Operation MN/SDM300L3.IOM Configuration Commands/Responses A.3.1 Modulator Configuration Commands Modulator Command: <add/MF_nnnnn.nnnn'cr' Where: nnnnn.nnnn = Frequency in MHz, 950.0000 to Frequency Response: >add/MF_nnnnn.nnnn'cr' 1750.0000 in 100 Hz steps for non-terminal frequency RF_OFF'cr''lf'] display. Status: <add/MF_'cr'...
  • Page 358 SDM-300L3 Satellite Modem Revision 1 Remote Control Operation MN/SDM300L3.IOM Command: <add/MPO_snn.n’cr’ Where: snn.n = +99.0 to –99.0, in 0.1 dB increments. Modulator Response: >add/MPO_snn.n’cr’’lf’] Power Note: The modulator power offset is added to the nominal Offset Status: <add/MPO_’cr’ power level to adjust the transmit power range.
  • Page 359 SDM-300L3 Satellite Modem Revision 1 Remote Control Operation MN/SDM300L3.IOM TX IESS- Command: <add/T315_xxx’cr’ Where: xxx = ON or OFF. 315 Mode Response: >add/T315_xxx’cr’’lf’] Status: <add/T315_’cr’ Response: >add/T315_xxx’cr’’lf’’] TX FSK Command: <add/FSK_xxx'cr' Where: xxx = ON or OFF. Output Response: >add/FSK_xxx'cr''lf'] Status: <add/FSK_'cr'...
  • Page 360 SDM-300L3 Satellite Modem Revision 1 Remote Control Operation MN/SDM300L3.IOM Demodulator Command: <add/SDRV_nnnn_mmmm.mmm'cr' Where: Rate Variable Response: >add/SDRV_nnnn_mmmm.mmm'cr''lf'] nnnn = 1/2 (QPSK 1/2 Turbo and non-Turbo), Assignment [coder rate], 3/4 (QPSK 3/4 Turbo and non- & Selection Status: See DR command.
  • Page 361 SDM-300L3 Satellite Modem Revision 1 Remote Control Operation MN/SDM300L3.IOM RX 8PSK 2/3 Command: <add/R310_xxx'cr' Where: xxx = ON or OFF. IESS-310 Response: >add/R310_xxx'cr''lf'] Operation Status: <add/R310_'cr' Response: >add/R310_xxx'cr''lf'] RX IESS-315 Command: <add/R315_xxx'cr' Where: xxx = ON or OFF. Operation Response: >add/R315_xxx'cr''lf']...
  • Page 362 SDM-300L3 Satellite Modem Revision 1 Remote Control Operation MN/SDM300L3.IOM Buffer Clock Command: <add/BC_xxx'cr' Where: xxx = INT (internal SCT clock), EXT Response: >add/BC_xxx'cr''lf'] (external TX terrestrial clock), SAT (receive Status: <add/BC_'cr' satellite clock), REF (external clock-reference Response: >add/BC_xxx'cr''lf'] frequency), INS (insert clock).
  • Page 363 SDM-300L3 Satellite Modem Revision 1 Remote Control Operation MN/SDM300L3.IOM Interface Command: <add/ICFR_xxxx'cr' Where: xxxx = AMI, HDB3, or B8ZS. Coding Response: >add/ICFR_xxxx'cr''lf'] Format Status: <add/ICFR_'cr' Receive Response: >add/ICFR_xxxx'cr''lf'] Transmit Command: <add/TDF_xxxx'cr' Where: xxxx = NONE, DATA, or AIS. Data Fault Response: >add/TDF_xxxx'cr''lf']...
  • Page 364 SDM-300L3 Satellite Modem Revision 1 Remote Control Operation MN/SDM300L3.IOM Bulk Drop Command: <add/BDCA_dd;cc_dd;cc_dd;cc_dd;cc..'cr' Where: Channels Response: >add/BDCA_dd;cc_dd;cc_dd;cc_dd;cc..'cr''lf'] dd = 1 to N (over the satellite drop channel); Assignment Status: <add/BDCA_'cr' where N = (modulator data rate) divided by Response: >add/BDCA_dd;cc_dd;cc_dd;cc_dd;cc..'cr''lf'] (64 kbps).
  • Page 365 SDM-300L3 Satellite Modem Revision 1 Remote Control Operation MN/SDM300L3.IOM ASYNC Command: <add/ROBR_nnnnn'cr' Where: nnnnn = 110, 150, 300, 600, 1200, 2400, Receive Response: >add/ROBR_nnnnn'cr''lf'] 4800, 9600, 19200, or 38400. Overhead Status: <add/ROBR_'cr' Baud Rate Response: >add/ROBR_nnnnn'cr''lf'] Note: RX ASYNC Overhead only.
  • Page 366 SDM-300L3 Satellite Modem Revision 1 Remote Control Operation MN/SDM300L3.IOM IBS Receive Command: <add/IBSR_xxxxx'cr' Where: xxxxx = DATA (64K DATA) or AUDIO ESC Type Response: >add/IBSR_xxxxx'cr''lf'] (2x32K AUDIO). Status: <add/IBSR_'cr' Response: >add/IBSR_xxxxx'cr''lf'] Note: RX IBS Overhead only. A.3.4 ODU Configuration Status...
  • Page 367 SDM-300L3 Satellite Modem Revision 1 Remote Control Operation MN/SDM300L3.IOM Recall Command: <add/RMC_n'cr' Where: n = 1, 2, 3, 4, or 5 (stored configuration number). Modem Response: >add/RMC_n'cr''lf'] This command causes the modem to be reprogrammed Config. with configuration parameters previously saved using the 'SMC_' command.
  • Page 368 SDM-300L3 Satellite Modem Revision 1 Remote Control Operation MN/SDM300L3.IOM AUPC Command: <add/MINP_snn.n'cr' Where: snn.n = -30.0 to -5.0, in 0.1 steps (nominal range Minimum Response: >add/MINP_snn.n'cr''lf'] in dBm). Power Limit Status: <add/MINP_'cr' Response: >add/MINP_snn.n'cr''lf'] Notes: 1. The nominal power range is modified relative to the value specified by the modulator power offset (MPO_).
  • Page 369 SDM-300L3 Satellite Modem Revision 1 Remote Control Operation MN/SDM300L3.IOM A.3.6 MUX PCB Configuration Commands (MUX PCB Installed Only) Command: <add/MTDR_x_yyyyyy'cr' Where: Tributary Response: >add/MTDR_x_yyyyyy'cr''lf'] Data Rate & x = 1 to 8 (tributary number). Enable Status: <add/MTDR_x'cr' Response: >add/MTDR_x_yyyyyy'cr''lf'] yyyyyy = OFF (disabled), or 0.6 to 4000.0 (kbps in 100 bits steps).
  • Page 370 SDM-300L3 Satellite Modem Revision 1 Remote Control Operation MN/SDM300L3.IOM A.3.7 Flex Mux Configuration Commands (Flex Mux PCB Installed Only) TX Channel Command: <add/TCEN_1_xxxx'cr' Where: xxxx = OFF (Disabled), DI (D&I Enabled), T1E1 #1 Enable Response: >add/TCEN_1_xxxx'cr''lf'] (T1/E1 Enabled). Status: <add/TCEN_1'cr' Response: >add/TCEN_1_xxxx'cr''lf']...
  • Page 371 SDM-300L3 Satellite Modem Revision 1 Remote Control Operation MN/SDM300L3.IOM TX Channel Command: <add/TCDP_x_yyy'cr' Where: Data Phase Response: >add/TCDP_x_yyy'cr''lf'] (Channels x = 3 or 4 (channel number). #3 and #4) Status: <add/TCDP_x'cr' Response: >add/TCDP_x_yyy'cr''lf'] yyy = NRM (normal data phasing) or INV (inverted data phasing).
  • Page 372 SDM-300L3 Satellite Modem Revision 1 Remote Control Operation MN/SDM300L3.IOM RX Channel Command: <add/RCCP_x_yyy'cr' Where: Clock Response: >add/RCCP_x_yyy'cr''lf'] Phase x = 3 or 4 (channel number). (Channels Status: <add/RCCP_x'cr' #3 and #4) Response: >add/RCCP_x_yyy'cr''lf'] yyy = NRM (normal clock phasing), INV (inverted clock phasing).
  • Page 373 SDM-300L3 Satellite Modem Revision 1 Remote Control Operation MN/SDM300L3.IOM Modulator/ Command: <add/MCP_'cr' Coder Response: >add/MCP_'cr' System Modem Type Config. SMT_xxxxxxx'cr' Interface Transmit Overhead Type Program ITOT_xxxxx'cr' Modem Operation Mode Status MOM_xxxxxxx'cr' Modulator Type MT_xxxxx'cr' Modulator Encoder Type MET_xxx'cr' Modulator Frequency (Non L-Band modem) MF_nnn.nnnnnnn'cr'...
  • Page 374 SDM-300L3 Satellite Modem Revision 1 Remote Control Operation MN/SDM300L3.IOM Notes: Data is only returned for TX D&I Overhead (or Flex Mux D&I). Data is only returned for TX IDR Overhead. Data is only returned for TX ASYNC Overhead Data not returned if Local AUPC is enabled & TX ASYNC/AUPC overhead.
  • Page 375 SDM-300L3 Satellite Modem Revision 1 Remote Control Operation MN/SDM300L3.IOM Demod/ Command: <add/DCP_'cr' Decoder Response: >add/DCP_'cr' Config. SMT_xxxxxxx'cr' System Modem Type Program IROT_xxxxx'cr' Interface Receive Overhead Type Status MOM_xxxxxxx'cr' Modem Operation Mode BERT_xxxx'cr' BER Threshold DT_xxxx'cr' Demodulator Type DDT_xxx'cr' Demodulator Decoder Type DF_nnnnn.nnnn'cr'...
  • Page 376 SDM-300L3 Satellite Modem Revision 1 Remote Control Operation MN/SDM300L3.IOM Notes: 1. Data is only returned for RX D&I overhead (or Flex Mux D&I mode).is installed. 2. Data is only returned for RX IDR Overhead. 3. Data is only returned for RX ASYNC Overhead.
  • Page 377 SDM-300L3 Satellite Modem Revision 1 Remote Control Operation MN/SDM300L3.IOM MINP_snn.n'cr' (Note 5) AUPC Minimum Power Value MAXP_snn.n'cr' (Note 5) AUPC Maximum Power Value LCL_xxxx'cr' (Note 5) AUPC Local Carrier Loss RCL_xxxx'cr' (Note 5) AUPC Remote Carrier Loss ENSP_nn.n'cr' (Note 6) AUPC EBN0 Target Set Point MAXT_n.n'cr'...
  • Page 378 SDM-300L3 Satellite Modem Revision 1 Remote Control Operation MN/SDM300L3.IOM A.4.4 Fault Status Modem Command: <add/MFS_'cr' Faults Status Response: >add/MFS_'cr' (Summary) DMD_xxx'cr' Demodulator (FLT/OK) MOD_xxx'cr' Modulator (FLT/OK) ITX_xxx'cr' Interface Transmit Side (FLT/OK) IRX_xxx'cr' Interface Receive Side (FLT/OK) CEQ_xxx'cr' Common Equipment (FLT/OK)
  • Page 379 SDM-300L3 Satellite Modem Revision 1 Remote Control Operation MN/SDM300L3.IOM Equipment Response: >add/CES_'cr' Status M&C_xxx'cr' Monitor & Control Module (OK/FLT) INT_xxx'cr' Data Interface/Overhead Module (OK/FLT) BAT_xxx'cr' Battery/Clock (OK/FLT) +5_xxx'cr' +5V Power Supply (OK/FLT) +12_xxx'cr' +12V Power Supply (OK/FLT) -12_xxx'cr' -12V Power Supply (OK/FLT)
  • Page 380 SDM-300L3 Satellite Modem Revision 1 Remote Control Operation MN/SDM300L3.IOM Interface Command: <add/IRES_'cr' Where: Read Error Response: >add/IRES_tttt_xn.nE-ee'cr''lf'] tttt = FRM (FRAME) or 2047 (indicates type of error Status being read). x = < or > (data modifier to indicate that the error rate is less than or greater than the returned value).
  • Page 381 SDM-300L3 Satellite Modem Revision 1 Remote Control Operation MN/SDM300L3.IOM Receive Command: <add/RSL_'cr' Where: Signal Level Response: >add/RSL_xsnn.ndBm'cr''lf'] x = < or > (data modifier to indicate that the receive Status signal level is less than or greater than the returned value).
  • Page 382 SDM-300L3 Satellite Modem Revision 1 Remote Control Operation MN/SDM300L3.IOM Stored Faults Information on stored faults is returned when requested. If no stored fault exists for a given fault number, the words “NO Fault” will be returned instead of the normal time/date status information.
  • Page 383 SDM-300L3 Satellite Modem Revision 1 Remote Control Operation MN/SDM300L3.IOM Interface Command: <add/IRSF_#'cr' Receive Side Response: >add/IRSF_# hh:mm:ss MM/DD/YYYY'cr' Stored Faults UNFL_xxx'cr' Buffer Underflow (OK/FLT) OVFL_xxx'cr' Buffer Overflow (OK/FLT) RXD_xxx'cr' Receive Data Loss/AIS (OK/FLT) FBER_xxx'cr' Frame BER (OK/FLT) BWA_xxx'cr' Receive Backward Alarm (OK/FLT)
  • Page 384 SDM-300L3 Satellite Modem Revision 1 Remote Control Operation MN/SDM300L3.IOM Bulk Consol. Command: <add/BCAS_'cr' Analog Response: >add/BCAS_p1,p2,p3, . . . pn'cr''lf'] This command is similar to the 'BCS_' command, but Status returns modem analog parameters. Additional status of new options and features will always be appended to the end.
  • Page 385 SDM-300L3 Satellite Modem Revision 1 Remote Control Operation MN/SDM300L3.IOM Bulk Command: <add/BCS_'cr' This command causes bulk modem status to be returned. To Consol. Response: >add/BCS_p1,p2,p3, . . . pn'cr''lf'] reduce the length of the response, message parameter data Status are returned without identifiers. However, parameter identification can be determined by order of return.
  • Page 386 SDM-300L3 Satellite Modem Revision 1 Remote Control Operation MN/SDM300L3.IOM Bulk Consol. Status (continued) Parameter Parameter Name (Command Reference) Description Number Demodulator rate p17 = nnnn_mmmm.mmm, code rate/data rate in kbps. (ref. 'DR_' command). p18 = nnnn_mmmm.mmm, code rate/data rate in kbps.
  • Page 387 SDM-300L3 Satellite Modem Revision 1 Remote Control Operation MN/SDM300L3.IOM Bulk Consol. Status (continued) Parameter Parameter Name (Command Reference) Description Number Transmit clock phase p35 = n, where 'n' is '0' (NRM), '1' (INV), '2' (AUTO). (ref. 'TCP_' command). p36 = n, where 'n' is '0' (NRM), '1' (INV).
  • Page 388 SDM-300L3 Satellite Modem Revision 1 Remote Control Operation MN/SDM300L3.IOM Bulk Consol. Status (continued) Parameter Parameter Name (Command Reference) Description Number Transmit data fault p53 = n, where 'n' is '0' (NONE), '1' (DATA), or '2' (AIS). (ref. 'TDF_' command). p54 = n, where 'n' is '0' (NONE), '1' (DATA), or '2' (AIS).
  • Page 389 SDM-300L3 Satellite Modem Revision 1 Remote Control Operation MN/SDM300L3.IOM Bulk Consol. Status (continued) Parameter Parameter Name (Command Reference) Description Number (Note 2) Demodulator Spectrum Rotation p71 = n, where 'n' is '0' (NRM), '1' (INV). (ref. 'DSR_' command). (Note 2) p72 = n, where 'n' is '0' (off) or '1' (on).
  • Page 390 SDM-300L3 Satellite Modem Revision 1 Remote Control Operation MN/SDM300L3.IOM Bulk Consol. Status (continued) Parameter Parameter Name (Command Reference) Description Number (Note 5) ASYNC TX Channel Stop p89 = n, where 'n' is the current number of stop bits programmed. (ref. 'TCSB_' command).
  • Page 391 SDM-300L3 Satellite Modem Revision 1 Remote Control Operation MN/SDM300L3.IOM Bulk Consol. Status (continued) Parameter Parameter Name (Command Reference) Description Number RTS TX-IF Control Mode p107 = n, where 'n' is '0' (off) or '1' (on). (ref. 'RTSM_' command). p108 = nn, CTS delay time in seconds.
  • Page 392 SDM-300L3 Satellite Modem Revision 1 Remote Control Operation MN/SDM300L3.IOM Notes: 1. Data will only be returned if TX Overhead is programmed for Drop & Insert. Comma is always returned. 2. Data will only be returned if RX Overhead is programmed for Drop & Insert. Comma is always returned.
  • Page 393 SDM-300L3 Satellite Modem Revision 1 Remote Control Operation MN/SDM300L3.IOM Bulk Command: <add/BCSF_'cr' This command causes all modem fault status to be Consoli- Response: >add/BCSF_abcdefghijklmnopqr'cr''lf'] returned. To reduce the length of the response, fault status dated is embedded into the bit structure of the characters that are Status returned.
  • Page 394 SDM-300L3 Satellite Modem Revision 1 Remote Control Operation MN/SDM300L3.IOM Character 'i': Interface transmit side faults character 3. Bit 6 = 1 always. Bit 5 = TX Audio Channel 1 Clip. Bit 4 = TX Audio Channel 2 Clip. Bit 3 = reserved.
  • Page 395 SDM-300L3 Satellite Modem Revision 1 Remote Control Operation MN/SDM300L3.IOM Character 'r': Interface Reed-Solomon Unavailable Seconds Bit 6 = 1 always. Bit 5 = not used. Bit 4 = not used. Bit 3 through Bit 0 = Binary representation (0 to 10) of the number of Reed-Solomon Unavailable Seconds stored faults.
  • Page 396 SDM-300L3 Satellite Modem Revision 1 Remote Control Operation MN/SDM300L3.IOM Boot M&C Command: <add/BFI_'cr' Where: Firmware Response: >add/BFI_'cr' xxx.yyy.zzz = Software version number (0.0.0 to Information VER_xxx.yyy.zzz'cr' 999.999.999). FW/nnnnnn-ddr'cr' nnnnnn = Firmware number (0 to 999999). mm/dd/yy'cr''lf'] dd = Firmware dash number (0 to 99).
  • Page 397 SDM-300L3 Satellite Modem Revision 1 Remote Control Operation MN/SDM300L3.IOM Card #1 Command: <add/C1OI_'cr' Options/ Response: >add/C1OI_'cr' Misc. Information OH_01 list: s,G.703 'cr' (- or +) s,IBS 'cr' (- or +) s,ASYNC_AUPC'cr' (- or +) s,D&I 'cr' (- or +) s,IDR 'cr''lf']...
  • Page 398 SDM-300L3 Satellite Modem Revision 1 Remote Control Operation MN/SDM300L3.IOM Card #3 Command: <add/C3OI_'cr' Options/ Response: >add/C3OI_'cr' Misc. Information RS_02 list: s,INTELSAT'cr' (- or +) s,AUPC'cr''lf'] (- or +) RS_03 list: s,INTELSAT'cr' (- or +) s,AUPC'cr''lf'] (- or +) TURBOlist: Duplex Reed-Solomon s, Intelsat’cr’...

  • Page 399: Appendix B. Burst Mode Modulator Operation

    Appendix B. Burst Mode Modulator Operation Theory of Operation The modulator is composed of two basic sections: the baseband processing section and the RF section. The modem M&C controls all programmable functions in both sections. B.1.1 Burst Mode From the front panel, TX Terrestrial or SCT can be selected for the modulator clock input.
  • Page 400 SDM-300Ls Satellite Modem Revision 1 Burst Mode Modulator Operation MN/SDM300L3.IOM energy dispersal. There is no need for a differential encoder in burst mode, as the ambiguities are resolved using the unique word. The data signal passes to the 1/2 rate Viterbi K=7 convolutional encoder.
  • Page 401 SDM-300Ls Satellite Modem Revision 1 Burst Mode Modulator Operation MN/SDM300L3.IOM B.2.2 Modulation and Encoding Types QPSK modulation and 1/2 rate Viterbi forward error correction encoding is standard. Encoder Code Rate Modulation Viterbi, K7 QPSK B.2.3 Scrambling Types One of the following scrambling types can be selected by the operator. •...
  • Page 402 SDM-300Ls Satellite Modem Revision 1 Burst Mode Modulator Operation MN/SDM300L3.IOM B.2.7 Transmit Frequency Change Time The time between the end of a remote command and the end of the modem reply for frequency change and synthesizer lock will be < 200 mS. B.2.8 Phase Noise 1.
  • Page 403 • INTELSAT/EUTELSAT • Closed net (Comtech EF Data) B.2.13 Spurious Emissions Spurious emissions are measured relative to the power of the modulated carrier. The measurement is done with the carrier on in continuous mode and modulated by the correct data/clock signal.
  • Page 404 SDM-300Ls Satellite Modem Revision 1 Burst Mode Modulator Operation MN/SDM300L3.IOM B.2.17 Transmit Preamble In burst mode, when RTS transitions from false to true, the modem shall turn on the RF carrier and generate a burst preamble with the following characteristics: 96 symbols at 19.2 kbps 352 symbols 31 symbols...
  • Page 405 SDM-300Ls Satellite Modem Revision 1 Burst Mode Modulator Operation MN/SDM300L3.IOM Burst Mode Specifications General Specifications Operating Frequency Range 950 to 1750 MHz, synthesized in 100 Hz steps Type of Modulation QPSK Operating Channel Spacing Less than 0.5 dB degradation operating with 2 adjacent- like channels, each 10 dB higher at 1.3 times the symbol rate, or a minimum of 1.2 times the specified acquisition range...
  • Page 406 SDM-300Ls Satellite Modem Revision 1 Burst Mode Modulator Operation MN/SDM300L3.IOM Additional Modulator Specifications Output Power -5 to -30 dBm, adjustable in 0.1 dB steps Output Spurious and Harmonics -55 dBc in 4 kHz BW in-band (50 to 180 MHz) -55 dBc in 4 kHz BW out-of-band (0 to 500 MHz) Output Impedance 75Ω...

  • Page 407: Metric Conversions

    METRIC CONVERSIONS Units of Length Unit Centimeter Inch Foot Yard Mile Meter Kilometer Millimeter 1 centimeter — 0.3937 0.03281 0.01094 6.214 x 10 0.01 — — 1 inch 2.540 — 0.08333 0.2778 1.578 x 10 0.254 — 25.4 1 foot 30.480 12.0 —...
  • Page 408 2114 85281 WEST TH STREET TEMPE ARIZONA 480 • 333 • 2200 PHONE 480 • 333 • 2161...

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