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

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SDM-300A
Satellite Modem
Installation and Operation Manual
Part Number MN/SDM300A.IOM
Revision 4

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  • Page 1 SDM-300A Satellite Modem Installation and Operation Manual Part Number MN/SDM300A.IOM Revision 4...

  • Page 2: Installation And Operation Manual

    SDM-300A Satellite Modem Installation and Operation Manual Part Number MN/SDM300A.IOM Revision 0 Comtech EFData is an ISO 9001 June 15, 2000 Registered Company. Copyright © Comtech EFData, 2000. All rights reserved. Printed in the USA. Comtech EFData, 2114 West 7th Street, Tempe, Arizona 85281 USA, (480) 333-2200, FAX: (480) 333-2161.

  • Page 3: Customer Support

    Customer Support Contact the Comtech EFData Customer Support Department for: • Product support or training • Information on upgrading or returning a product • Reporting comments or suggestions concerning manuals A Customer Support representative may be reached at: Comtech EFData Attention: Customer Support Department 2114 West 7th Street Tempe, Arizona 85281 USA...

  • Page 4: Table Of Contents

    Table of Contents Customer Support................................ i Overview of Revisions.............................. xiv About this Manual ..............................xiv Related Documents..............................xiv Conventions and References........................... xv Cautions and Warnings ............................xv Metric Conversion.............................. xv Recommended Standard Designations ....................... xv Trademarks................................. xv Reporting Comments or Suggestions Concerning this Manual ................xv European EMC Directive............................
  • Page 5 SDM-300A Preface 1.2.3.3 UB-54 Breakout Panel......................1–10 Modem Assemblies........................... 1–11 Typical Spectral Occupancy ........................1–13 Dimensional Envelope ..........................1–14 CHAPTER 2. INSTALLATION ..................2–1 Unpacking..............................2–1 Installation..............................2–2 External Modem Connections........................2–4 2.3.1 Remote Connector and Pinouts (J6)....................2–6 2.3.2 Fault Connector and Pinouts (J7) ......................2–7 2.3.3...
  • Page 6 3.3.13.4 Utility System........................... 3–62 3.3.13.5 Utility Modem Type Functions ....................3–68 3.3.13.6 Utility Factory Setup ........................ 3–71 3.3.14 SDM-300A Custom Modem Defaults ..................3–74 Software Configuration ........................... 3–76 3.4.1 Modem Types............................ 3–76 3.4.2 Operation............................3–77 3.4.2.1 IDR Operation .......................... 3–77 3.4.2.2...
  • Page 7 SDM-300A Preface 4.1.3 Remote Address ..........................4–4 Modulator..............................4–5 4.2.1 Modulator Specifications ........................4–6 4.2.2 Theory of Operation ..........................4–6 4.2.3 Theory of Modulation Types....................... 4–8 Demodulator............................... 4–9 4.3.1 Demodulator Specifications ......................4–10 4.3.2 Theory of Operation .......................... 4–10 Decoder ..............................4–12 Interface..............................
  • Page 8 Preface SDM-300A A.1.3.2.6 Backward Alarm ......................... A–14 A.1.3.3 D&I Framing Formats ......................A–15 A.1.3.4 D&I Modem Defaults......................A–18 A.1.4 Asynchronous Interface/AUPC......................A–19 A.1.4.1 AUPC ............................A–21 A.1.4.1.1 Self-Monitoring Local Modem AUPC Control..............A–22 A.1.4.2 Remote AUPC......................... A–23 A.1.4.3 Theory of Operation ........................ A–23 A.1.4.3.1...
  • Page 9 SDM-300A Preface A.3.1 Overhead Interface PCB Installation....................A–69 A.3.1.1 Installation ..........................A–70 A.3.2 Hardware Upgrades.......................... A–72 A.3.2.1 Main PCB ..........................A–72 A.3.2.2 Overhead Interface PCB......................A–73 A.3.3 8-Channel Multiplexer Option ......................A–74 A.3.3.1 Installation ..........................A–75 A.3.3.2 Specifications Summary......................A–77 A.3.4...
  • Page 10 Preface SDM-300A C.2.8 Frequency Reference...........................C–8 C.2.9 Transmit Frequency Change Time ......................C–8 C.2.10 Phase Noise.............................C–8 C.2.11 Transmit IF Output Switch ......................C–9 C.2.12 Transmit IF Power ..........................C–9 C.2.13 Modulator Power Offset .........................C–9 C.2.14 Modulated IF Output Shape......................C–9 C.2.15 Spurious Emissions.........................C–9 C.2.16 Modulator Phase Error........................C–10 C.2.17...
  • Page 11 SDM-300A Preface Interface Specifications ........................C–38 C.6.1 Interface General..........................C–38 C.6.2 Transmit Clock Source........................C–38 C.6.3 Send Clock Timing Source .......................C–38 C.6.3.1 Transmit Clock Switching Due to Failure of Selected Clock...........C–39 C.6.3.2 Transmit Clock Phase Adjustment ...................C–39 C.6.3.3 Transmit Data Phase Adjustment .....................C–39 C.6.3.4...
  • Page 12 Doppler ..............................C–57 GLOSSARY ........................g–1 INDEX ........................i–1 Figures Figure 1-1. SDM-300A ............................1–1 Figure 1-2. Modular Design............................. 1–5 Figure 1-3. Block Diagram ............................1–6 Figure 1-4. Typical Spectral Occupancy........................ 1–12 Figure 1-5. Dimensional Envelope ........................1–13 Figure 2-1. Installation of the Mounting Bracket..................... 2–3 Figure 2-2.
  • Page 13 SDM-300A Preface Figure 3-20. Utility System Menu ......................... 3–60 Figure 3-21. Utility Modem Type Menu........................ 3–66 Figure 3-22. Utility Factory Setup Menu ....................... 3–71 Figure 3-23. RF Loopback ............................. 3–72 Figure 3-24. IF Loopback ............................3–72 Figure 3-25. Baseband Loopback .......................... 3–73 Figure 3-26.
  • Page 14 Table 2-9. AUX 1 Connector and Pinouts (J9) ...................... 2–18 Table 2-10. Alarms Connector and Pinouts (J10) ....................2–19 Table 3-1. LED Indicators ............................3–2 Table 3-2. SDM-300A Custom Modem Defaults ....................3–74 Table 3-3. Modem Types ............................3–76 Table 3-4. IDR Parameter Settings ........................3–77 Table 3-5.
  • Page 15 SDM-300A Preface Table A-21. Specification Summary........................A–77 Table A-22. MUX Data 100-Pin Connector (J10) ....................A–78 Table A-23. System Specification......................... A–80 Table A-24. Multiplexer Specification........................A–81 Table A-25. Demultiplexer Specific Specifications....................A–82 Table A-26. 50-Pin Connector Pin Assignments ....................A–85 Table C-1.

  • Page 16: Overview Of Revisions

    Added Doppler paragraph as C-13. About this Manual This manual provides installation and operation information for the Comtech EFData SDM-300A satellite modem. This is a technical document intended for earth station engineers, technicians, and operators responsible for the operation and maintenance of the SDM-300A.

  • Page 17: Conventions And References

    SDM-300A Preface Conventions and References Cautions and Warnings CAUTION indicates a hazardous situation that, if not avoided, may result in minor or moderate injury. CAUTION may also be used to indicate other unsafe practices or risks of property damage. CAUTIO N WARNING indicates a potentially hazardous situation that, if not avoided, could result in death or serious injury.

  • Page 18: European Emc Directive

    Preface SDM-300A European EMC Directive In order to meet the European Electro-Magnetic Compatibility (EMC) Directive (EN55022, EN50082-1), properly shielded cables for DATA I/O are required. More specifically, these cables must be shielded from end-to-end, ensuring a continuous ground shield. The following information is applicable for the European Low Voltage Directive (EN60950): <HAR>...

  • Page 19: Warranty Policy

    SDM-300A Preface Warranty Policy This Comtech EFData product is warranted against defects in material and workmanship for a period of one year from the date of shipment. During the warranty period, Comtech EFData will, at its option, repair or replace products that prove to be defective.

  • Page 20: Chapter 1. Introduction

    Chapter 1. INTRODUCTION This chapter provides an overview of the SDM-300A satellite modem, referred to in this manual as “the modem” (Figure 1-1). Figure 1-1. SDM-300A Rev. 4 1–1...

  • Page 21: Overview

    Introduction SDM-300A Satellite Modem Overview The SDM-300A Satellite Modem is a high performance, full-duplex, digital-vector, modulator/demodulator that meets the open network requirements of the INTELSAT Earth Station Standards (IESS) -308, -309, and –310 emulation specifications for the following: • Intermediate Data Rate (IDR) •...

  • Page 22: Additional Features

    SDM-300A Satellite Modem Introduction 1.1.1 Additional Features The modem contains the following additional features: • Fully Accessible System Topology (FAST) (refer to Appendix A) • Built-in self test (refer to Chapter 5) • Asymmetrical loop timing • IDR Engineering Service Circuit (ESC) channel option of 64k data or two audio channels •...
  • Page 23 Introduction SDM-300A Satellite Modem Two mechanisms are provided for uplink power control within a closed network. • One method, which requires the optional ASYNC/AUPC interface card, is used for control between two links to sustain sufficient transmit power to maintain a programmed E at both ends.

  • Page 24: Modem Construction

    SDM-300A Satellite Modem Introduction 1.1.3 Modem Construction The modem contains: Built-in scramblers/descramblers TX and RX frequency synthesizers Differential encoder/decoder Multi-rate FEC convolutional Viterbi and Sequential Decoder The modem is a complete, self-contained unit in a standard, one-rack unit (1 RU), 19- inch (48 cm), rack-mountable enclosure weighing approximately 11 lbs (5 kg).

  • Page 25: Figure 1-3. Block Diagram

    Introduction SDM-300A Satellite Modem Refer to Figure 1-3 for a system block diagram. Notes: 1. The UB-300 (UB-530 alternate part #) universal breakout panel (BOP) is an option for V.35, G703, EIA-232, and EIA-422. 2. When the modem is equipped with a 50-pin data I/O connector, the use of the BOP is required to interface with the customer data connector to the modem.

  • Page 26: Options

    SDM-300A Satellite Modem Introduction Options Refer to Table 1-1 for available options. Table 1-1. Options Option Requirements -20 dB return loss 50 to 180 MHz 50Ω IF Impedance Output 2nd Harmonics: < 45 dBc at data rates < 64 kbit/s -20 to +5 dBm IF output <...

  • Page 27: Fast Options

    Introduction SDM-300A Satellite Modem 1.2.1 FAST Options The modem has a variety of hardware options available as shown in Table 1-2. Hardware options are available through conventional means as well as through Aaptive Broadband’s FAST system. OQPSK mode is available through the FAST feature. For detailed descriptions of the FAST feature and all options, refer to Appendix A.

  • Page 28: Factory Options

    SDM-300A Satellite Modem Introduction 1.2.2 Factory Options 1.2.2.1 Factory-Installed Options Consult an EFData Customer Support representative for modem options. The following options are installed at the factory: • Output Impedance: 75Ω (50Ω Optional) • High Stability Reference Oscillator • High-power version (+5 to -20 dBm) •...

  • Page 29: Ub-530 Breakout Panel

    Introduction SDM-300A Satellite Modem 1.2.3 Breakout Panel 1.2.3.1 UB-300 Universal Breakout Panel The UB-300 universal breakout panel can function as an IDR, D&I, or ASYNC/AUPC data breakout panel in one small rack-mountable unit. For more information, refer to the EFData UB-300 Universal Breakout Panel Installation and Operation Manual.

  • Page 30: Modem Assemblies

    SDM-300A Satellite Modem Introduction Modem Assemblies Refer to Table 1-3 for part numbers of various modules. Table 1-3. EFData Part Numbers for Various Modules Factory- or User- Factory- Installed Installed Part Number Description Comments PL/6092 Assy, Top chassis PL/6095-1 optional Module, AC -5 Output 75Ω...

  • Page 31: Typical Spectral Occupancy

    Introduction SDM-300A Satellite Modem Typical Spectral Occupancy Figure 1-4 shows a typical spectral occupancy curve using the EFData filter mask. Figure 1-4. Typical Spectral Occupancy 1–12 Rev. 4...

  • Page 32: Dimensional Envelope

    SDM-300A Satellite Modem Introduction Dimensional Envelope Refer to Figure 1-5 for the unit’s dimensional envelope. Note: Dimensions are listed in inches and centimeters are in parenthesis. 14 .0 1.75 (36) (4.4 ) 19 .0 (4.8 ) 1.25 (3.2 ) 3.625 3.625...
  • Page 33 Introduction SDM-300A Satellite Modem This page is intentionally left blank. 1–14 Rev. 4...

  • Page 34: Chapter 2. Installation

    Chapter 2. INSTALLATION This chapter provides unpacking and installation instructions, and a description of external connections and backward alarm information. The equipment contains parts and assemblies sensitive to damage by Electrostatic Discharge (ESD). Use ESD precautionary procedures when touching, removing, or inserting PCBs. CAUTIO N Unpacking The modem and manual are packaged in pre-formed, reusable, cardboard cartons...

  • Page 35: Installation

    Installation SDM-300A Satellite Modem Installation The modem arrives fully assembled from the factory. After unpacking the modem, install the modem as follows: 1. If required, install the mounting bracket in equipment rack (Figure 2-1). Install and tighten the bracket bolts.

  • Page 36: Figure 2-1. Installation Of The Mounting Bracket

    SDM-300A Satellite Modem Installation Figure 2-1. Installation of the Mounting Bracket Rev. 4 2–3...

  • Page 37: External Modem Connections

    Installation SDM-300A Satellite Modem External Modem Connections When a breakout panel, such as the UB-300, is not required, the rear panel connectors provide all necessary external connections between the modem and other equipment. Table 2-1 lists these connectors, and Figure 2-2 through Figure 2-6 show their locations.

  • Page 38: Figure 2-2. Basic Modem, 25-Pin D Connector

    SDM-300A Satellite Modem Installation EX RE F RX/IF INPUT T X /I F O U TP UT REMOTE AUX 1 CP 3 CP 1 FAULT ALARMS Figure 2-2. Basic Modem, 25-Pin D Connector T X /I F O U TP UT...

  • Page 39: Remote Connector And Pinouts (J6)

    Installation SDM-300A Satellite Modem 2.3.1 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. Screw locks are provided for mechanical security of the mating connector.

  • Page 40: Fault Connector And Pinouts (J7)

    SDM-300A Satellite Modem Installation 2.3.2 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 41: Data I/O Interface Connector (J8)

    Installation SDM-300A Satellite Modem 2.3.3 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. The modem is currently available with a choice of four Data I/O connectors, as follows: •...

  • Page 42: Table 2-4. 25-Pin D Connector Pinouts

    SDM-300A Satellite Modem Installation Table 2-4. 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 TT+B SCTE+B ST+B SCT+B...

  • Page 43: Table 2-5. 34-Pin Winchester Connector Pinouts (V.35)

    Installation SDM-300A Satellite Modem Table 2-5. 34-Pin Winchester Connector Pinouts (V.35) Pin # Name Ground Ground Request to Send (RTS) Clear to Send (CTS) Data Set Ready (DSR) Receive Line Signal Detect (RLSD) Send Data A (SD-A) Receive Data A (RD-A)

  • Page 44: Table 2-6. 37-Pin Connector Pinouts (Optional)

    SDM-300A Satellite Modem Installation Table 2-6. 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 RR+B MC+B TT+B There are jumpers on the PL/6031 EIA-422 interface. Place the jumpers on the center pin and the pin towards the Master Clock (MC) to allow an external clock input on pins 16 and 34.

  • Page 45: Table 2-7. 50-Pin Connector Pinouts

    Installation SDM-300A Satellite Modem Table 2-7. 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 (232 only)
  • Page 46 SDM-300A Satellite Modem Installation 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 47: Data I/O Interface Connector (J8) Removal/Installation

    Installation SDM-300A Satellite Modem 2.3.3.1 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: Data I/O Connector (J8) Removal

    SDM-300A Satellite Modem Installation 2.3.3.1.1 Data I/O Connector (J8) Removal 1. (For Ribbon-Configured Connector PL/6031.) Remove Data I/O connector (J8) (Figure 2-7) as follows: a. Remove four screws securing the rear panel to the chassis. b. Pull out rear panel to gain access to disconnect connector (J8).

  • Page 49: Data I/O Connector (J8) Installation

    Installation SDM-300A Satellite Modem 2.3.3.1.2 Data I/O Connector (J8) Installation 1. (For Ribbon-Configured Connector PL/6031.) Install Data I/O connector (J8) (Figure 2-7) as follows: a. Position connector (J8) in rear panel. Use care when connecting the data I/O connector (J8) to the PCB.

  • Page 50: Figure 2-7. Data I/O Connector (J8) Removal/Installation

    SDM-300A Satellite Modem Installation For Ribbon-Configured Connector For 50-Pin Connector with Overhead Interface Board Figure 2-7. Data I/O Connector (J8) Removal/Installation Rev. 4 2–17...

  • Page 51: Auxiliary 1 Connector And Pinouts (J9)

    Installation SDM-300A Satellite Modem 2.3.4 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. A logic “1”...

  • Page 52: Alarms Connector And Pinouts (J10)

    SDM-300A Satellite Modem Installation 2.3.5 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 53: External Reference (Cp3)

    Installation SDM-300A Satellite Modem 2.3.8 External Reference (CP3) CP3 is a BNC connector for an external reference. The input impedance is 75Ω. For ≥ normal operation, the reference signal is 0 dBm. Valid External Reference frequencies are 1, 5, 10, and 20 MHz.

  • Page 54: Chapter 3. Operation

    Chapter 3. OPERATION This chapter describes the front panel operation of the modem, including the menus and their explanations, software configuration, clocking information, and buffering. For information about remote control operation, refer to Appendix Front Panel The modem front panel (Figure 3-1) enables control of modem configuration parameters and displays the modem status.

  • Page 55: Led Indicators

    Operation SDM-300A Satellite Modem All functions are accessible at the front panel by entering one of six pre-defined Function Select categories or levels: • Configuration • Monitor • Faults/Alarms • Stored Faults/Alarms • Remote AUPC (ASYNC mode only) • Utility 3.1.1...

  • Page 56: Front Panel Keypad

    SDM-300A Satellite Modem Operation 3.1.2 Front Panel Keypad The front panel keypad permits local operation of the modem. The keypad consists of six keys (Figure 3-2). EN TER C LE AR Figure 3-2. Keypad Each key provides one or more logical functions. These functions are defined in the following table.
  • Page 57 Operation SDM-300A Satellite Modem This page is intentionally left blank. 3–4 Rev. 4...

  • Page 58: Menu System

    SDM-300A Satellite Modem Operation Menu System To access and execute all functions, refer to Figure 3-4 through Figure 3-22. Use the Main menu in Figure 3-3 as a quick reference for accessing the modem functions. For further configuration details, refer to Section 3.2.
  • Page 59 Operation SDM-300A Satellite Modem Press [↑] or [↓] to change the parameters. After the display represents the correct parameters, press [ENTER] to execute the change. This action initiates the necessary programming by the modem. To undo a parameter change prior to execution, press [CLEAR].

  • Page 60: Front Panel Menu

    SDM-300A Satellite Modem Operation Front Panel Menu SDM300A "TYPE" VER: 5.1.3 F U N C T I O N S E L E C T F U N C T I O N S E L E C T F U N C T I O N S E L E C T...

  • Page 61: Figure 3-4. Configuration Modulator Menu

    Operation SDM-300A Satellite Modem S D M 3 0 0 A " T Y P E " F U N C T I O N S E L E C T C O N F I G U R A T I O N VER: X.X.X...

  • Page 62: Configuration Modulator

    SDM-300A Satellite Modem Operation 3.3.1 Configuration Modulator Refer to Figure 3-4. TX-X CODE_RATE Transmit code rate/type selection. Select one of the following or a variable rate selection (V), as follows: TX-x QPSK 1/2 Code Rate Data Rate Range BPSK 1/2 2.4 to 1250 kbit/s...
  • Page 63 Operation SDM-300A Satellite Modem TX-IF FREQUENCY Programs the modulator transmit frequency between 50 and 180 MHz, in 1 Hz steps. Upon entry, the current transmitter frequency is displayed with the flashing cursor on the first character. Press [←] or [→] to move the flashing cursor, and [↑] or [↓] to increment or decrement the digit at the...
  • Page 64 SDM-300A Satellite Modem Operation CARRIER MODE Programs the modem for continuous wave mode. Four modes of operation are available: (Test Mode Configuration) • NORMAL-MODULATED: The Carrier mode is normally in the off position. • CENTER-CW: Generates a carrier at the current modulator frequency.

  • Page 65: Figure 3-5. Configuration Demodulator Menu

    Operation SDM-300A Satellite Modem SDM300A "TYPE" FUNCTION SELECT CONFIGURATION VER: X.X.X CONFIGURATION D E M O D U L A T O R DIFFERENTIAL RX-X QPSK 1/2 RX-IF FREQUENCY D E S C R A M B L E R...

  • Page 66: Configuration Demodulator

    SDM-300A Satellite Modem Operation 3.3.2 Configuration Demodulator Refer to Figure 3-5. RX-x CODE_RATE/TYPE Receiver code rate/type selection. Select one of the following or a variable rate selection (V) as follows: RX-x QPSK 1/2 Code Rate Data Rate Range BPSK 1/2 2.4 to 1250 kbit/s...
  • Page 67 Operation SDM-300A Satellite Modem RF LOOP BACK Programs the modem for RF loopback operation. (Test Mode Configuration) 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 68 SDM-300A Satellite Modem Operation REACQUISITION Programs the sweep reacquisition mode time duration. This is the time that the modem will remain in a narrow sweep after loss of acquisition. After this timer runs out, the modem will return to the normal acquisition sweep.

  • Page 69: Figure 3-6. Configuration Interface Menu

    Operation SDM-300A Satellite Modem S D M 3 0 0 A " T Y P E " F U N C T I O N S E L E C T C O N F I G U R A T I O N VER: X.X.X...
  • Page 70 SDM-300A Satellite Modem Operation C O N F I G U R A T I O N INTERFACE continued S E R V I C E D R O P C H A N N E L D R O P F O R M A T...

  • Page 71: Configuration Interface

    Operation SDM-300A Satellite Modem 3.3.3 Configuration Interface Refer to Figure 3-6. TX CLOCK SOURCE Programs the clock source for the modem transmitter clock to the following configurations: • TX TERRESTRIAL: Sets the TX clock to recover timing from the incoming clock/data.
  • Page 72 SDM-300A Satellite Modem Operation BUFFER CLOCK Programs the interface buffer output clock to one of the following modes: • RX (SATELLITE): Sets the output buffer clock to the satellite clock. (This is a Bypass.) • SCT (INTERNAL): Sets the buffer clock to operate from the modem internal clock.
  • Page 73 Operation SDM-300A Satellite Modem B-BAND LOOP BACK Programs the modem for baseband loopback operation. (Test Mode Configuration) 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 74 SDM-300A Satellite Modem Operation RX DATA FAULT Receive data fault. Selects a receive interface fault monitor of NONE, AIS, or DATA. The data monitored for RX data is coming from the satellite. Refer to TX DATA FAULT for a description of function choices.
  • Page 75 Operation SDM-300A Satellite Modem SERVICE CHANNEL This configuration function is used to set service channel audio levels ADJUST at TX-1, TX-2, RX-1, or RX-2. Upon entry, press [←] or [→] to select the desired service channel. To adjust the service channel level (+10.0 to -20.0 dBm), press [ENTER].
  • Page 76 SDM-300A Satellite Modem Operation DROP CHANNEL Programs the drop channels into the following desired time slot: ASSIGNMENTS • DROP SAT CHANNEL TERR • DROP SAT T-SLOT TERR Note: Dropping time slot 0 is not allowed for E1_CCS, E1_CAS, or E1_31_TS. Use time slot 16 only in E1_31_TS. The number of drop channels is data rate dependent.
  • Page 77 Operation SDM-300A Satellite Modem ASYNC RX BAUD Programs the ASYNC overhead receive baud rate. Upon entry, the status of the ASYNC RX baud rate is displayed. Press [↑] or [↓] key to select one baud rate. Press [ENTER] to execute the change.
  • Page 78 SDM-300A Satellite Modem Operation This page is intentionally left blank. Rev. 4 3–25...

  • Page 79: Figure 3-7. Configuration Local Aupc Menu

    Operation SDM-300A Satellite Modem C O N F I G U R A T I O N SDM300A "TYPE" F U N C T I O N S E L E C T L O C A L A U P C VER: X.X.X...

  • Page 80: Configuration Local Aupc

    SDM-300A Satellite Modem Operation 3.3.4 Configuration Local AUPC Refer to Figure 3-7. AUPC ENABLE Programs the AUPC on or off. Upon entry, the status is displayed. Press [↑] or [↓] to make the selection. Press [ENTER] to execute the change.

  • Page 81: Figure 3-8. Configuration Mux

    Operation SDM-300A Satellite Modem SDM300A "TYPE" F U N C T I O N S E L E C T C O N F I G U R A T I O N M U X VER: X.X.X F I G U R A T I O N...

  • Page 82: Configuration Mux

    SDM-300A Satellite Modem Operation 3.3.5 Configuration MUX Refer to Figure 3-8. TRIBUTARY INTERFACE Programs the Tributary Interface (EIA-232 or EIA-422 to either Disabled or 0.6 to 4000 kbit/s (in 100 bit/s steps). Configure all tributarties first, then add all the data rates together, plus the 1.3k overhead to configure the aggregate data rate.
  • Page 83 Operation SDM-300A Satellite Modem SDM300A "TYPE" F U N C T I O N S E L E C T C O N F I G U R A T I O N VER: X.X.X C O N F I G U R A T I O N...
  • Page 84 SDM-300A Satellite Modem Operation R X C H A N # 1 M O D E R X C H A N # 1 D R R X C H A N # 2 M O D E R X C H A N # 3 M O D E D &...

  • Page 85: Configuration Flex Mux

    Operation SDM-300A Satellite Modem 3.3.6 Configuration Flex Mux Refer to Figure 3-9. TX CHAN # 1 MODE Programs the TX Channel # 1 Mode: D&I Enabled, T1/E1 Enabled, or Disabled. Press[←] or [→] to move the flashing cursor, and [↑] or [↓] to increment or decrement the selected kbit/s.
  • Page 86 SDM-300A Satellite Modem Operation RX CHAN # 1 MODE Programs the TX Channel # 1 mode, D&I Enabled, T1/E1 Enabled, or Disabled. Press[←] or [→] to move the flashing cursor, and [↑] or [↓] to increment or decrement the selected kbit/s. Press [ENTER] to execute the change.

  • Page 87: Figure 3-10. Configuration Save Menu

    Operation SDM-300A Satellite Modem S D M 3 0 0 A " T Y P E " F U N C T I O N S E L E C T C O N F I G U R A T I O N VER: X.X.X...

  • Page 88: Configuration Save

    SDM-300A Satellite Modem Operation 3.3.7 Configuration Save Refer to Figure 3-10. The Configuration Save menu allows programming of configuration parameters into memory on the M&C. There are five memory locations that may be used to store specific configuration setups that are used frequently.

  • Page 89: Figure 3-12. Monitor Menu

    Operation SDM-300A Satellite Modem SDM300A "TYPE" F U N C T I O N S E L E C T VER: X.X.X M O N I T O R C O R R E C T E D R A W B E R...

  • Page 90: Monitor

    SDM-300A Satellite Modem Operation 3.3.9 Monitor Refer to Figure 3-12. When the Monitor level is entered, press [←] or [→] to select the desired monitor function. Each monitor function is displayed in real time as long as it is selected.

  • Page 91: Figure 3-13. Faults/Alarms Menu

    Operation SDM-300A Satellite Modem S D M 3 0 0 A " T Y P E " F U N C T I O N S E L E C T VER: X.X.X F A U L T S / A L A R M S...

  • Page 92: Faults/Alarms

    SDM-300A Satellite Modem Operation 3.3.10 Faults/Alarms Refer to Figure 3-13. The Faults/Alarms menu is accessible from the Function Select menu. The Faults/Alarms are similar to monitor functions, as they display the current fault status of the group being displayed. Press [←] or [→] to move between the following Faults/Alarms groups: •...

  • Page 93: Modulator Faults

    Operation SDM-300A Satellite Modem 3.3.10.1 Modulator Faults 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. I CHANNEL I channel data activity fault.

  • Page 94: Receive Interface Faults

    SDM-300A Satellite Modem Operation 3.3.10.4 Receive Interface Faults BUFFER UNDERFLOW Buffer underflow alarm. Indicates that a buffer underflow has occurred. BUFFER OVERFLOW Buffer overflow alarm. Indicates that a buffer overflow has occurred. RX DATA/AIS Data or AIS. When data fault is selected in the Configuration Interface menu (Figure 3-6), the fault indicates a data stable condition.

  • Page 95: Common Equipment Faults

    Operation SDM-300A Satellite Modem 3.3.10.5 Common Equipment Faults 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. CONTROLLER Controller fault. Typically indicates the controller has gone through a power on/off cycle.
  • Page 96 SDM-300A Satellite Modem Operation This page is intentionally left blank. Rev. 4 3–43...

  • Page 97: Figure 3-14. Stored Faults/Alarms Menu

    Operation SDM-300A Satellite Modem F U N C T I O N S E L E C T SDM300A "TYPE" S T O R E D VER: X.X.X F A U L T S / A L A R M S...

  • Page 98: Stored Faults/Alarms

    SDM-300A Satellite Modem Operation 3.3.11 Stored Faults/Alarms Refer to Figure 3-14. The modem stores the first 10 (Flt0 through Flt9) occurrences of fault status changes in each of the following major fault categories: • Modulator • Demodulator • Transmit Interface •...

  • Page 99: Figure 3-15. Remote Aupc Configuration Menu

    Operation SDM-300A Satellite Modem SDM300A "TYPE" F U N C T I O N S E L E C T R E M O T E A U P C VER: X.X.X R E M O T E A U P C...

  • Page 100: Remote Aupc

    SDM-300A Satellite Modem Operation 3.3.12 Remote AUPC To view or change the Remote AUPC functions, enter the Remote AUPC menu from the Function Select menu on the front panel. After entering the Remote AUPC menu, press [←] or [→] to select the Configuration or Monitor menu. Enter the selected menu by pressing [ENTER].
  • Page 101 Operation SDM-300A Satellite Modem This page is intentionally left blank. 3–48 Rev. 4...

  • Page 102: Utility

    SDM-300A Satellite Modem Operation 3.3.13 Utility The Function Select Utility menu is divided into the following categories: • Modulator • Demodulator • Interface • System • Modem Type • Factory Setup Refer to through Figure 3-22 for different menu categories. The menu information includes: •...

  • Page 103: Figure 3-17. Utility Modulator Menu

    Operation SDM-300A Satellite Modem S D M 3 0 0 A " T Y P E " F U N C T I O N U T I L I T Y U T I L I T Y VER: X.X.X...

  • Page 104: Utility Modulator

    SDM-300A Satellite Modem Operation 3.3.13.1 Utility Modulator Refer to Figure 3-17. UTILITY If CR/DR is blank, ENTER CR: _____ code and DR one time only. If CR/DR is displayed, DR: ________ kb, fixed code/data rate is shown. ASSIGN TRANSMIT Transmit code rate/type selection. Select one of the following or a variable rate...
  • Page 105 Operation SDM-300A Satellite Modem ENCODER TYPE Encoder type selection. Select Viterbi or Sequential encoder type. Note: Change in EFD, ASYNC, or Custom modem types only Press[←], [→], [↑], or [↓] to move the flashing cursor. Press [ENTER] to execute the change.

  • Page 106: Figure 3-18. Utility Demodulator Menu

    SDM-300A Satellite Modem Operation S D M 3 0 0 A " T Y P E " F U N C T I O N U T I L I T Y VER: X.X.X S E L E C T U T I L I T Y...

  • Page 107: Utility Demodulator

    Operation SDM-300A Satellite Modem 3.3.13.2 Utility Demodulator Refer to Figure 3-18. ASSIGN RECEIVER RX code rate/type selection. Select one of the following as follows: FILTERS RX-x QPSK 1/2 Code Rate Data Rate Range BPSK 1/2 2.4 to 1250 kbit/s QPSK 1/2 4.8 to 2500 kbit/s...
  • Page 108 SDM-300A Satellite Modem Operation RX BPSK ORDERING Receive BPSK bit ordering selection. Select STANDARD or NON- STANDARD. Press[←], [→], [↑], or [↓] to move the flashing cursor. Press [ENTER] to execute the change. DEMOD SPECTRUM Programmable vector rotation. Select NORMAL or INVERT for spectrum reversal of the I and Q baseband channels.

  • Page 109: Figure 3-19. Utility Interface Menu

    Operation SDM-300A Satellite Modem S D M 3 0 0 A " T Y P E " F U N C T I O N S E L E C T U T I L I T Y V E R : X . X . X...
  • Page 110 SDM-300A Satellite Modem Operation I D R B A C K W A R D ASYNC TX TYPE ASYNC RX TYPE A L A R M C O N T R O L RS-232 RS-232 BW ALARM RX #4 ON/OFF...

  • Page 111: Utility Interface

    Operation SDM-300A Satellite Modem 3.3.13.3 Utility Interface Refer to Figure 3-19. TX OVERHEAD TYPE Select None, IDR, IBS, DROP & INSERT, or ASYNC for TX overhead type. Note: Overhead types are selectable only when Custom is selected for modem type in the Utility Modem Type menu.
  • Page 112 SDM-300A Satellite Modem Operation IDR BACKWARD Controls IDR monitor and alarm functions when not using a ALARM CONTROL communications link. Use this option to select ON or OFF for the RX and TX alarms. Press [↑] or [↓] to select the backward alarm RX or TX numbers 1 through 4.

  • Page 113: Figure 3-20. Utility System Menu

    Operation SDM-300A Satellite Modem SDM300A 'TYPE' F U N C T I O N S E L E C T UTILITY V E R : X . X . X UTILITY S Y S T E M T I M E : H H : M M : S S A M / P M...
  • Page 114 SDM-300A Satellite Modem Operation EXT AGC: MIN PWR E X T A G C : M A X P W R M A S T E R R E S E T 0.0 to 10.0 VOLTS 0.0 to 10.0 VOLTS H A R D (in 0.5 v steps)

  • Page 115: Utility System

    Operation SDM-300A Satellite Modem 3.3.13.4 Utility System Refer to Figure 3-20. TIME: HH:MM:SS AM/PM Time of day and date display/set function. DATE: MM/DD/YY The current time and date in the modem’s memory are displayed when selected. To change the modem time and/or date, press [ENTER].
  • Page 116 SDM-300A Satellite Modem Operation 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. • AUTO initiates built-in self test when turning on modem. • RUN initializes self test.
  • Page 117 Operation SDM-300A Satellite Modem MASTER RESET Master reset function. Initiating a hard reset will reset the modem and place the default configuration settings in ROM. Initiating a soft reset will reset the modem hardware, but saves CAUTIO N the current configuration settings.
  • Page 118 SDM-300A Satellite Modem Operation This page is intentionally left blank. Rev. 4 3–65...

  • Page 119: Figure 3-21. Utility Modem Type Menu

    Operation SDM-300A Satellite Modem SDM300A "TYPE" F U N C T I O N S E L E C T UTILITY VER: X.X.X UTILITY M O D E M T Y P E UTILITY M O D E M T Y P E...
  • Page 120 SDM-300A Satellite Modem Operation L O C A L M O D E M C A R D # 1 O P T I O N S C A R D # 2 O P T I O N S...

  • Page 121: Utility Modem Type Functions

    Operation SDM-300A Satellite Modem 3.3.13.5 Utility Modem Type Functions Refer to Figure 3-21. MODEM TYPE Selects the following types of modem operation: • CUSTOM Selections are made from the Front Panel menu • D&I D&I • ASYNC ASYNC Overhead Option •...
  • Page 122 SDM-300A Satellite Modem Operation REV EMULATION Programs an emulation mode of a previous functional revision. This allows the user to select the CURRENT VERSION or FUNCTIONAL X. Note: The number displayed in the CURRENT VERSION position increases with each software version change.
  • Page 123 Operation SDM-300A Satellite Modem LOCAL MODEM Configures the modem for the self-monitoring Local Modem AUPC mode and AUPC for local TX power control (self-monitoring) due to severe rain fade. Notes: The self-monitoring Local Modem AUPC mode is not used when the ASYNC/AUPC is selected as the Modem Type.

  • Page 124: Utility Factory Setup

    SDM-300A Satellite Modem Operation SDM300A "TYPE" FUNCTION SELECT UTILITY VER: X.X.X UTILITY F A C T O R Y S E T U P UTILITY FACTORY S E T U P Key: ACCESS TO CONDITIONAL OR Parameter Information SUBMENU OPTION-DEPENDENT Factory Setting Figure 3-22.

  • Page 125: Figure 3-23. Rf Loopback

    Operation SDM-300A Satellite Modem DATA IBS o r IDR EN C O DER / C USTO M ER T X = 7 0 M H z TR AN SM IT R F IN TERFAC E M ODU LATOR D ATA...

  • Page 126: Figure 3-25. Baseband Loopback

    SDM-300A Satellite Modem Operation IB S O R IDR E NCO DE R/ C USTO ME R TRAN SM IT RF M O DULATO R D ATA EQ U IPME NT IN TERFA CE A NT EN N A R E M O T E S E R IA L...

  • Page 127: Sdm-300A Custom Modem Defaults

    Address/Parity/Baud Rate EXT AGC Max Power • • Remote Type Display Contrast • EXT AGC MIN Power Table 3-2. SDM-300A Custom Modem Defaults Modulator Demodulator Data Rate Date Rate TX Rate A 64 kbit/s, QPSK 1/2 RX Rate A 64 kbit/s, QPSK 1/2...

  • Page 128: Figure 3-9. Configuration Flex Mux

    SDM-300A Satellite Modem Operation Table 3-2. SDM-300A Custom Modem Defaults (Continued) Configuration Flex Mux TX Chan # 1 Mode D&I Enabled RX Chan # 1 Mode D&I Enabled TX Chan # 1 DR 64.0 kbit/s RX Chan # 1 DR 64.0 kbit/s...

  • Page 129: Software Configuration

    Operation SDM-300A Satellite Modem Table 3-2. SDM-300A Custom Modem Defaults (Continued) Utility Modem Type Modem Type Custom Card #1 Overhead 01 Modem Emulation Disabled Card #2 Reed-Solomon 02 Rev Emulation Current Card #3 Reed-Solomon 03 Local Modem AUPC Software Configuration 3.4.1...

  • Page 130: Operation

    SDM-300A Satellite Modem Operation 3.4.2 Operation 3.4.2.1 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 (PL/5305-1) • 50-pin D relay adapter card (PL/5509) The IDR option is a FAST feature that must be enabled using the front panel and the Utility Modem Type menu.

  • Page 131: Ibs Operation

    Operation SDM-300A Satellite Modem 3.4.2.2 IBS Operation To operate the modem in the IBS configuration, the following cards must be installed in the modem: • Overhead G.703/IDR/IBS/ASYNC/AUPC/D&I card (PL/5305-1) • 50-pin D relay adapter card (PL/5509) The IBS option is a FAST feature that must be enabled using the front panel and the Utility Modem Type menu.

  • Page 132: D&I Operation

    SDM-300A Satellite Modem Operation 3.4.2.3 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 (PL/5305-1) • 50-pin D relay adapter card (PL/5509) The D&I option is a FAST feature that must be enabled using the front panel and the Utility Modem Type menu.

  • Page 133: Async/Aupc Operation

    Operation SDM-300A Satellite Modem 3.4.2.4 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 (PL/5305-1) • 50-pin D relay adapter card (PL/5509) The ASYNC/AUPC option is a FAST feature that must be enabled using the front panel and the Utility Modem Type menu.

  • Page 134: Efd Closed Network Operation

    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. The EFData closed network configuration allows the SDM-300A to be compatible with any EFData closed network application.

  • Page 135: Custom Operation

    Operation SDM-300A Satellite Modem Table 3-9. EFD Closed Network Parameter Settings 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 RX-V, QPSK 1/2...

  • Page 136: Sdm-100 Emulation Operation

    • Replace an SDM-100 requiring service with SDM-300A. • Use SDM-300A as the backup modem for a rack containing a mix of SDM-100 and SDM-300A modems. SDM-100 Emulation is typically a closed network application, with no added overhead. The modem does not required any additional hardware to operate in SDM-100 Emulation.

  • Page 137: Sdm-6000 Emulation Operation

    • Replace an SDM-6000 requiring service with SDM-300A. • Use SDM-300A as the backup modem for a rack containing a mix of SDM-300A and SDM-6000 modems. The SDM-6000 Emulation can be an open or closed network application. If SDM-6000 application requires the use if IDR, IBS, D&I, or ASYNC overhead, then the Overhead PCB must be installed in the SDM-300A, and the applicable FAST option shall be enabled using the front panel.

  • Page 138: Revision Emulation Operation

    Revision Emulation Operation To program an emulation mode from Version 1.1.1 through the current version, use the revision emulation feature in the Utility Modem Type menu. Refer to Table 3-12. Table 3-12. SDM-300A Revision Emulation Software Version # Firmware # Rev.

  • Page 139: Clocking Options

    Operation SDM-300A Satellite Modem 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. 3.5.1 EIA-232, EIA-422, or V.35 Master/Master Refer to Figure 3-27 for: •...

  • Page 140: Idr/Ibs G.703 Master/Master

    SDM-300A Satellite Modem Operation 3.5.3 IDR/IBS G.703 Master/Master Use this application when both earth stations have high stability clocks and the received data is to be clocked to the local network. Refer to Figure 3-29 for: • Clocking block diagram •...

  • Page 141: Figure 3-27. Eia-422, Eia-232, Or V.35 Master/Master Clocking Diagram

    Operation SDM-300A Satellite Modem TX C LO C K = T X T ER R E ST R IA L H IG H S TA BILITY O S C IL LATO R IN TER N A L O S C ILLATO R...

  • Page 142: Figure 3-28. Eia-422, Eia-232, Or V.35 Master/Slave Clocking Diagram

    SDM-300A Satellite Modem Operation TX C LO C K = TX TE R R E S T R IA L H IG H S TA BILITY O SC ILL AT IO N TE R R E S TR IA L...

  • Page 143: Figure 3-29. Idr/Ibs G.703 Master/Master Clocking Diagram

    Operation SDM-300A Satellite Modem TX C LO C K + T X T E R R E S T R IA L D ATA C L O C K R E C O V E R Y C L O C K...

  • Page 144: Figure 3-30. Idr/Ibs G.703 Master/Slave Clocking Diagram

    SDM-300A Satellite Modem Operation T X C L O C K + T X T E R R E S T R IA L D ATA C L O C K R E C O V E R Y C LO C K...

  • Page 145: Figure 3-31. D&I G.703 Master/Master Clocking Diagram

    Operation SDM-300A Satellite Modem T X C L O C K = T X T E R R E S T R I A L D D I D D I S E N D D A T A D R O P...

  • Page 146: D&I G.703 Master/Master

    SDM-300A Satellite Modem Operation 3.5.5 D&I G.703 Master/Master In the D&I configuration, the most typical clocking option is the master/master application. Refer to Figure 3-31 for: • Blocking diagram • Transmit clock options • Buffer clock options Buffering The purpose of a receive buffer is two reasons: •...

  • Page 147: Figure 3-32. Clock Slip

    Operation SDM-300A Satellite Modem PLE SIO C H RONO U S O P ER ATIO N IS NO T EXACTLY EQ UAL TO f 1) INCOM ING TR AFFIC T OO FAST 2) IN C O M IN G T R A FFIC TO O SLO W...

  • Page 148: Figure 3-33. Doppler Shift

    SDM-300A Satellite Modem Operation SAT ELLITE M O T IO N AN D O R BITAL IN C LIN AT IO N A S ATE LL ITE IS M AIN TAIN E D AT A N AS SIG N ED GE O S TATIO N A RY...

  • Page 149: Buffer Size

    Operation SDM-300A Satellite Modem 3.6.1 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 • Allowable time between clock slips 3.6.1.1...

  • Page 150: Plesiochronous

    SDM-300A Satellite Modem Operation 3.6.1.2 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 151: Frame/Multiframe Length

    Operation SDM-300A Satellite Modem 3.6.1.3 Frame/Multiframe Length The depth of the receive buffer required has been discussed in Section 3.4.1.2, and is applicable to all unframed data. When the data is framed (such as 2048 kbit/s G732 or 1544 kbit/s G733), it is desirable to provide slips in predefined locations.

  • Page 152: Chapter 4. Theory Of Operation

    Chapter 4. THEORY OF OPERATION This chapter contains the theory of operation data for the satellite modem. Monitor and Control (M&C) The M&C monitors the modem and provides configuration updates to other modems within the modem when necessary. The modem configuration parameters are maintained in battery-backed RAM, which provides total recovery after power-down situation.

  • Page 153: Theory Of Operation

    Theory of Operation SDM-300A Satellite Modem 4.1.1 Theory of Operation 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 154 SDM-300A Satellite Modem Theory of Operation 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 can be 8 or 32 kbytes in size.

  • Page 155: Remote Baud Rate

    Theory of Operation SDM-300A Satellite Modem 4.1.2 Remote Baud Rate The remote communications baud rate and parity are programmed by the front panel control in the Utility System menu (refer to Chapter 3). The programmed baud rate and parity are maintained indefinitely in RAM on the M&C module. The parity bits can be set to EVEN or ODD.

  • Page 156: Modulator

    SDM-300A Satellite Modem Theory of Operation Modulator The modulator provides PSK modulated carriers within the 50 to 180 MHz range. The types of modulation that encode the transmitted baseband data from the interface PCB are: • BPSK • QPSK •...

  • Page 157: Modulator Specifications

    Theory of Operation SDM-300A Satellite Modem 4.2.1 Modulator Specifications Refer to Appendix C for modulator specifications. 4.2.2 Theory of Operation The modulator is composed of eight basic subsections. These subsections are divided into the baseband processing section and the RF section of the modulator. The modulator controls all programmable functions on this module.

  • Page 158: Theory Of Modulation Types

    SDM-300A Satellite Modem Theory of Operation The two identical digital Nyquist filters are followed by Direct Digital Modulation. Symbol rates up to 2.5 Mbit/s can be achieved automatically. The modulated carrier is applied to the RF section for conversion to the correct output frequency.

  • Page 159: Demodulator

    Theory of Operation SDM-300A Satellite Modem Demodulator A block diagram of the demodulator is shown in Figure 4-3. The demodulator converts PSK modulated carriers within the 50 to 180 MHz range to a demodulated baseband data stream. The converted modulation types are BPSK, QPSK, OQPSK, and 8PSK (refer to Section 4.2.3 for a description of modulation types).

  • Page 160: Demodulator Specifications

    SDM-300A Satellite Modem Theory of Operation 4.3.1 Demodulator Specifications Refer to Appendix C for demodulation specifications. 4.3.2 Theory of Operation The demodulator functions as an advanced, digital, coherent-phase-lock receiver and decoder. Demodulator faults are also reported to the front panel. The demodulator consists of the following basic subsections.
  • Page 161 Theory of Operation SDM-300A Satellite Modem programmed to the desired center frequency via the M&C. The output of the DDS is sent to the RF module and provides the reference to which the local oscillator is locked. The M&C sweeps the local oscillator (via DDS programming) through the user-specified sweep range.

  • Page 162: Decoder

    SDM-300A Satellite Modem Theory of Operation Decoder The SDM-300A can be configured in any of the following configurations: • Basic SDM-300A (Sequential or Viterbi Decoder) • FAST options (Sequential or Viterbi Decoder) • FAST options with Reed-Solomon hardware (Sequential or Viterbi Decoder) •...

  • Page 163: Interface

    Theory of Operation SDM-300A Satellite Modem Interface The terrestrial interface functions include: • MUX various types of ESC into the data • Buffering the receive data • DEMUX various types of ESC from the data • Monitoring and displaying the interface status without interruption of service The interface block diagram is shown in Figure 4-4.

  • Page 164: Figure 4-4. Interface Block Diagram

    SDM-300A Satellite Modem Theory of Operation INTER FACE LOO PB ACK O V E R H E A D R ECE IVER S O V E R H EA D T X S AT RO CE SS OR S D ATA...

  • Page 165: Interface Specifications

    Theory of Operation SDM-300A Satellite Modem 4.5.1 Interface Specifications Notes: 1. Refer to Appendix A for information on the following: • G.703 • • • Drop and Insert (D&I) • Asynchronous 2. Refer to Appendix B for interface specifications. 4.5.2 Plesiochronous/Doppler/Buffer Data from the DEMUX section is fed into a buffer.

  • Page 166: Closed Network

    SDM-300A Satellite Modem Theory of Operation 4.5.3 Closed Network Typically, the closed network operation does not add overhead to the terrestrial data. The closed network operation is not dictated by a specification. The terrestrial data and clock are passed through the baseband loopback relay and are translated from the selected baseband format to TTL.

  • Page 167: Backward Alarm Theory And Connections

    Theory of Operation SDM-300A Satellite Modem Backward Alarm Theory and Connections Four sets of transmit and receive backward alarms are available to implement the structure defined in IESS-308. Backward alarms are sent to the distant side of an IDR link to signal that trouble has occurred at the receive side (which may have resulted from an improper transmission).
  • Page 168 SDM-300A Satellite Modem Theory of Operation A backward alarm being received on a particular link is detected by one of the two following methods: • The backward alarm output drives a FORM C relay with all three contacts available on the data connector.
  • Page 169 Theory of Operation SDM-300A Satellite Modem This page is intentionally left blank. 4–18 Rev. 4...

  • Page 170: Chapter 5. Maintenance

    Chapter 5. MAINTENANCE This chapter provides the following information: • System checkout • Fault isolation • Module replacement and identification System Checkout This equipment contains parts and assemblies sensitive to damage by ESD. Use ESD precautionary procedures when touching, removing, or inserting PCBs.

  • Page 171: Interface Checkout

    Maintenance SDM-300A Satellite Modem 5.1.1 Interface Checkout Use the following procedure and the test setup in Figure 5-1 to inspect the interface. Figure 5-1. Fault Isolation Test Setup 1. Connect a BER test set to the appropriate modem data connector as shown in Figure 5-1.

  • Page 172: Modulator Checkout

    SDM-300A Satellite Modem Maintenance 5.1.2 Modulator Checkout Use the following procedure to check out the modulator: 1. Set up the equipment as shown in Figure 5-1. Refer to Chapter 4 for modulator specifications. 2. Set up the modem for operation by using the Configuration Modulator and Demodulator front panel menus.
  • Page 173 Maintenance SDM-300A Satellite Modem Table 5-1. Conversion to S/N and E Chart (dB) Code Rate 1/2 Code Rate 3/4 Code Rate 7/8 (S+N)/N -0.6 10.0 10.5 10.1 10.1 10.1 10.1 11.0 10.6 10.6 10.6 10.6 11.5 11.2 11.2 11.2 11.2 12.0...

  • Page 174: Figure 5-2. Typical Output Spectrum (With Noise)

    SDM-300A Satellite Modem Maintenance RL -49.00 dBm ATTEN 10 dB 2.00 dB/DIV RES BANDWIDTH 10.0 kHz M odem Rate = 2144 kbit/s, 3/4 R ate C oding w ith 7.8 dB Eb/N o (S + N)/N = 10 dB SPAN 1.000 MHz CENTER 70.000 MHz...

  • Page 175: Demodulator Checkout

    Maintenance SDM-300A Satellite Modem 5.1.3 Demodulator Checkout Use the following procedure to test the demodulator. 1. Set up the equipment as shown in Figure 5-1. Refer to Chapter 4 for the demodulator specifications. 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 176: Figure 5-4. Typical Eye Constellations

    SDM-300A Satellite Modem Maintenance WITH NOISE WITHOUT NOISE Figure 5-4. Typical Eye Constellations Rev. 4 5–7...

  • Page 177: Fault Isolation

    Maintenance SDM-300A Satellite Modem Fault Isolation The modem’s design allows a technician to repair a faulty modem on location. This equipment contains parts and assemblies sensitive to damage by ESD. Use ESD precautionary procedures when touching, removing, or inserting PCBs.

  • Page 178: Table 5-2. Sdm-300A Fault Tree

    SDM-300A Satellite Modem Maintenance Table 5-2. SDM-300A Fault Tree MODULATOR FAULTS IF SYNTHESIZER DATA CLOCK SYN I CHANNEL Q CHANNEL MODEM REF ACT MODEM REF PLL DEMODULATOR FAULTS CARRIER DETECT IF SYNTHESIZER I CHANNEL Q CHANNEL BER THRESHOLD MODULE Legend...
  • Page 179 Maintenance SDM-300A Satellite Modem Table 5-2. SDM-300A Fault Tree (Continued) TX INTERFACE FAULTS TX DROP TX DATA/AIS TX CLK PLL TX CLK ACTIVITY TX AUDIO 1 CLIP TX AUDIO 2 CLIP RX INTERFACE FAULTS BUFFER UNDERFLOW BUFFER OVERFLOW RX DATA/AIS...
  • Page 180 SDM-300A Satellite Modem Maintenance Table 5-2. SDM-300A Fault Tree (Continued) COMMON EQUIP FAULTS BATTERY/CLOCK -12V POWER SUPPLY +12V POWER SUPPLY +5V SUPPLY CONTROLLER SELF TEST INTERFACE MODULE BACKWARD ALARMS (IDR OVERHEAD ONLY) BW ALARM RX #4 BW ALARM RX #3...

  • Page 181: Faults/Alarms Display

    Maintenance SDM-300A Satellite Modem 5.2.2 Faults/Alarms Display General fault, status, and alarm information are indicated by 10 LEDs located on the modem’s front panel. A fault (red LED) indicates a fault that currently exists in the modem. When a fault occurs, it is stored in the stored fault memory, and indicated by the single yellow LED.

  • Page 182: Modulator Faults

    SDM-300A Satellite Modem Maintenance 5.2.3.1 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. DATA CLOCK SYN Transmit data clock synthesizer fault.

  • Page 183: Demodulator Faults

    Maintenance SDM-300A Satellite Modem 5.2.3.2 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 184: Transmit Interface Faults

    SDM-300A Satellite Modem Maintenance 5.2.3.3 Transmit Interface Faults Fault/Alarm Possible Problem and Action TX DROP Drop interface hardware fault (D&I only). The typical cause of this fault is the drop phase-locked loop is not locked, or some other drop interface hardware has malfunctioned.

  • Page 185: Receive Interface Faults

    Maintenance SDM-300A Satellite Modem 5.2.3.4 Receive Interface Faults Fault/Alarm Possible Problem and Action BUFFER UNDERFLOW Buffer underflow alarm. Indicates the plesiochronous buffer has underflowed. Buffer underflow is normally a momentary fault (there are clock problems if this alarm is continuously present). This alarm is included in this section to be consistent with the fault reporting system and to be correctly registered in the stored fault memory.
  • Page 186 SDM-300A Satellite Modem Maintenance Fault/Alarm Possible Problem and Action BUFFER CLK PLL Buffer clock phase-locked loop fault. The buffer synthesizer is the wrong frequency or will not lock. Ensure the selected buffer clock source is at the proper frequency and level.

  • Page 187: Common Equipment Faults

    Maintenance SDM-300A Satellite Modem 5.2.3.5 Common Equipment Faults Fault/Alarm Possible Problem and Action BATTERY/CLOCK M&C battery voltage or clock fault. Indicates a low voltage in the memory battery. Typically, this fault will be active when a modem has been hard reset or the firmware has been changed.

  • Page 188: Backward Alarms Faults

    SDM-300A Satellite Modem Maintenance 5.2.3.6 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 189 Maintenance SDM-300A Satellite Modem This page is intentionally left blank. 5–20 Rev. 4...

  • Page 190: Appendix Aoptions

    Appendix A OPTIONS This appendix describes the options available for the SDM-300A. Available options are: • Fully Accessible System Topology (FAST) Options • Conventional Options • Software and Hardware Upgrades ♦ 8-Channel Multiplexer Option ♦ Flex Mux The following table is provided to assist the operator through Appendix A: A.1 FAST Accessible Options...

  • Page 191: Fast Accessible Options

    Options SDM-300A Satellite Modem FAST Accessible Options Comtech EFData’s 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 192: A.1.1 Fast System Theory

    SDM-300A Satellite Modem Options A.1.1 FAST System Theory FAST is an enhancement feature available only in Comtech EFData products, enabling on-location upgrade of the operating feature set—in the rack—without removing a modem from the setup. When service requirements change, the operator can upgrade the topology of the modem to meet those requirements within minutes after confirmation by Comtech EFData.
  • Page 193 Options SDM-300A Satellite Modem 2. Select desired features as follows: a. Use [←] and [→] to select Modem Options menu. b. Press [ENTER]. c. Scroll through the Modem Options and check off all features that display a “+” sign as follows:...
  • Page 194 SDM-300A Satellite Modem Options 5. Enter access codes as follows: a. Press [CLEAR] to return to the Main menu. b. Use [←] and [→] to select Function Select Utility menu. c. Press [ENTER]. d. Use [←] and [→] to select Utility Modem Type menu.
  • Page 195 Options SDM-300A Satellite Modem 7. Check upgrade as follows: a. Press [CLEAR] to return to the Main menu. b. Use [←] and [→] to select Function Select Utility menu. c. Press [ENTER]. d. Use [←] and [→] to select Utility Modem Type menu.

  • Page 196: A.1.3 D&I

    SDM-300A Satellite Modem Options A.1.3 D&I Note: If required, refer to Section A.3 for installation of the overhead interface PCB. The D&I MUX works in conjunction with the interface card to enable the modem to transmit or receive fractional parts of a T1 data stream.

  • Page 197: D&I Specifications

    Options SDM-300A Satellite Modem A.1.3.1 D&I Specifications Refer to Table A-2 for D&I specifications. Table A-2. D&I Specifications Parameter Specification Primary Data Circuits Supported T1 DSD, DRD, ISD, IRD E1 DSD, DRD, ISD, IRD Primary Data Rates Supported 1544 kbit/s per G.703 2048 kbit/s per G.703...
  • Page 198 SDM-300A Satellite Modem Options Table A-2. D&I Specifications (Continued) Parameter Specification Buffer Depth T1, T1_ESF, E1_CCS, 1, 2, 4, 8, 16, or 32 ms E1_31_TS E1_CAS 7.5, 15, or 30 ms Depth Status Monitored accurate to 1% Buffer Centering Automatic (start of service), manual...

  • Page 199: Figure A-1. D&I With Asynchronous Overhead Block Diagram

    Options SDM-300A Satellite Modem TRANSM IT SECTION A LA R M B W A LA R M M O N IT O R S A L A R M M O N ITO R F R A M IN G /T IM IN G...

  • Page 200: Figure A-2. D&I With Asynchronous Overhead Data Flow

    SDM-300A Satellite Modem Options Figure A-2. D&I with Asynchronous Overhead Data Flow Rev. 4 A–11...

  • Page 201: Theory Of Operation

    Options SDM-300A Satellite Modem A.1.3.2 Theory of Operation The main features of the D&I option are as follows: • Data interface • Transmit MUX • Receive DEMUX • • Backward alarm A.1.3.2.1 Data Interference Data interface contains transformer balanced data interfaces that support CCITT G.703 parameters and dejitter.

  • Page 202: Receive Demux

    SDM-300A Satellite Modem Options As a test mode, the transmit data can be replaced with a 2047 pattern. This selection overrides the AIS. Only user data bits are replaced with the pattern, while the Engineering Service Channel (ESC) (including framing and alarms) will operate normally.

  • Page 203: Engineering Service Channel (Esc

    Options SDM-300A Satellite Modem 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 204: D&I Framing Formats

    SDM-300A Satellite Modem Options A.1.3.3 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_ESF_S T1 Extended Super Frame Special...

  • Page 205: Figure A-3. E1 Framing Formats

    Options SDM-300A Satellite Modem Figure A-3. E1 Framing Formats A–16 Rev. 4...

  • Page 206: Figure A-4. T1 Framing Formats

    SDM-300A Satellite Modem Options Figure A-4. T1 Framing Formats Rev. 4 A–17...

  • Page 207: D&I Modem Defaults

    Options SDM-300A Satellite Modem A.1.3.4 D&I Modem Defaults Refer to Table A-3 for D&I Modem Defaults. Table A-3. D&I Modem Defaults Modulator Demodulator Data Rate Data Rate TX Rate A 64 kbit/s, QPSK 1/2 RX Rate A 64 kbit/s, QPSK 1/2...

  • Page 208: A.1.4 Asynchronous Interface/Aupc

    SDM-300A Satellite Modem Options A.1.4 Asynchronous Interface/AUPC Note: If required, refer to Section A.3 for installation of the overhead interface PCB. 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 209: Figure A-5. Async/Aupc Block Diagram

    Options SDM-300A Satellite Modem The ASYNC interface PCB also provides its own Doppler buffer, which has a maximum depth of 32 ms at the highest terrestrial data rate. Buffer fill status can be checked in the Monitor menu on the front panel of the modem. Depth selection and centering of the buffer are provided in the Configuration Interface menu.

  • Page 210: Aupc

    SDM-300A Satellite Modem Options A.1.4.1 AUPC The AUPC function allows each of two modems in a closed link to control the output of the other modem. Both modems must have the AUPC options enabled. These options are: AUPC ENABLE Enables the AUPC to function locally.

  • Page 211: Self-Monitoring Local Modem Aupc Control

    Options SDM-300A Satellite Modem Notes: 1. Modem B will not make changes to modem A if the E is within 0.5 dB of the target noise. 2. Modem B will not control modem A transmitting output level if the target noise for modem B is set within 15.5 to 16.0 dB and the receive signal to the modem is sufficient that the receive noise is 16 dB or better.

  • Page 212: Remote Aupc

    SDM-300A Satellite Modem Options A.1.4.2 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 213: Mux Operation

    Options SDM-300A Satellite Modem A.1.4.3.3 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 data can be clocked into the MUX by the terrestrial clock or an internal clock.

  • Page 214: Loop Timing Operation

    SDM-300A Satellite Modem Options 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 215: Non-Async Operation

    Options SDM-300A Satellite Modem A.1.4.3.8 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 216: A.1.4.3.10 Valid Async Baud Rates

    SDM-300A Satellite Modem Options A.1.4.3.10 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 217: Async Remote Operation

    Options SDM-300A Satellite Modem A.1.4.5 ASYNC Remote Operation Remote modems can be controlled over the ASYNC channel from the local (or “hub”) modem. Refer to Table A-4 for a list of combinations: Table A-4. ASYNC Remote Operation Configuration Local To Remote...

  • Page 218: Figure A-6. Remote Async Connection Diagram For Y Cable

    SDM-300A Satellite Modem Options W Y SE R E M O T E T E R M IN A L (O R E Q U IVA LE N T ) V.3 5 V.3 5 D ATA D ATA C O N N E C T O R...

  • Page 219: Configuration #1 (Local Eia-232 To Remote Eia-232

    Options SDM-300A Satellite Modem A.1.4.5.1 Configuration #1 (Local EIA-232 to Remote EIA-232) Table A-5. 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 ASYNC TX and RX Baud Rate 150 to 38400 (See A.1.4.3.10)

  • Page 220: Configuration #2 (Local Eia-232 To Remote Eia-485 [4-Wire

    SDM-300A Satellite Modem Options A.1.4.5.2 Configuration #2 (Local EIA-232 to Remote EIA-485 [4-Wire]) Table A-6. 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 EIA-232 Configuration Interface Menu...

  • Page 221: Configuration #3 (Local Eia-232 To Remote Eia-485 [2-Wire

    Options SDM-300A Satellite Modem A.1.4.5.3 Configuration #3 (Local EIA-232 to Remote EIA-485 [2-Wire]) Table A-7. 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 EIA-232 Configuration Interface Menu...

  • Page 222: Configuration #4 (Local Eia-485 [4-Wire] To Remote Eia-232

    SDM-300A Satellite Modem Options A.1.4.5.4 Configuration #4 (Local EIA-485 [4-Wire] to Remote EIA-232) Table A-8. 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 EIA-485 (4-wire) Configuration Interface Menu...

  • Page 223: Configuration #5 (Local Eia-485 [4-Wire] To Remote Eia-485 [4-Wire

    Options SDM-300A Satellite Modem A.1.4.5.5 Configuration #5 (Local EIA-485 [4-Wire] to Remote EIA-485 [4-Wire]) Table A-9. 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 EIA-485 (4-wire)

  • Page 224: Configuration #6 (Local Eia-485 [4-Wire] To Remote Eia-485 [2-Wire

    SDM-300A Satellite Modem Options A.1.4.5.6 Configuration #6 (Local EIA-485 [4-Wire] to Remote EIA-485 [2-Wire]) Table A-10. 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 EIA-485 (4-wire)

  • Page 225: Configuration #7 (Local Eia-485 [2-Wire] To Remote Eia-232

    Options SDM-300A Satellite Modem A.1.4.5.7 Configuration #7 (Local EIA-485 [2-Wire] to Remote EIA-232) Table A-11. 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 EIA-485 (2-wire) Configuration Interface Menu...
  • Page 226 SDM-300A Satellite Modem Options 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 227: Table A-12. Local Eia-485 (2-Wire) To Remote Eia-485 (4-Wire

    Options SDM-300A Satellite Modem A.1.4.5.8 Configuration #8 (Local EIA-485 [2-Wire] to Remote EIA-485 [4-Wire]) Table A-12. 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 EIA-485 (2-wire)
  • Page 228 SDM-300A Satellite Modem Options 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 229: Async/Aupc Modem Defaults

    Options SDM-300A Satellite Modem A.1.4.6 ASYNC/AUPC Modem Defaults Refer to Table A-13 for ASYNC/AUPC modem defaults. Table A-13. ASYNC/AUPC Modem Defaults Modulator Demodulator Data Rate Data Rate TX Rate A 64 kbit/s, QPSK 1/2 RX Rate A 64 kbit/s, QPSK 1/2...

  • Page 230: Sequential Decoder

    SDM-300A Satellite Modem Options Decoder A.1.4.7 Sequential Decoder The sequential decoder is used in closed network applications, typically in Frequency Division Multiple Access (FDMA) satellite communications systems. The sequential decoder is a FAST option. Refer to Figure A-8 for a block diagram of the sequential decoder.

  • Page 231: Theory Of Operation

    Options SDM-300A Satellite Modem A.1.4.7.1 Theory of Operation The sequential decoder also works in conjunction with the convolutional encoder at the transmitting modem to correct bit errors in the received data stream from the demodulator. The sequential decoder processes 2-bit quantized I&Q channel data symbols from the demodulator.

  • Page 232: Viterbi Decoder

    SDM-300A Satellite Modem Options The corrected data is buffered through the output RAM and re-timing circuit, which provides a data stream to the differential decoder and descrambler at the constant rate of the data clock. The data and the clock are then output from the card.

  • Page 233: Specifications

    Options SDM-300A Satellite Modem A.1.4.8.1 Specifications Refer to Table A-14 for Viterbi specification. Table A-14. Viterbi Specification Parameter Specification See Chapter 1 Maximum Data Rate 2.048 Mbit/s (rate 1/2) 2.048 Mbit/s (rate 3/4) 2.048 Mbit/s (rate 7/8) Synchronization Time 8000 bits (maximum)

  • Page 234: Reed-Solomon Decoder

    SDM-300A Satellite Modem Options The branch metrics are then processed by the ASC computer. The ASC computer makes decisions about the most probable transmitted symbol stream with the state metrics computed for the previous 64 decoder inputs. The results of the ASC computer are stored in the path memory (80 states in depth). The path with the maximum metric is designated as the survivor path, and its data is used for output.

  • Page 235: A.1.5 Idr

    Options SDM-300A Satellite Modem A.1.5 IDR IDR operation adds 96 kbit/s overhead to the terrestrial data. The terrestrial data rates supported are: • 1.544 Mbit/s (T1) + 96k = 1640 Mbit/s on the data rate menu • 2.048 Mbit/s (E1) + 96k = 2144 Mbit/s on the data rate menu The terrestrial data is passed through the baseband loopback relay and is translated from the G.703 format to TTL with a recovered clock.
  • Page 236 SDM-300A Satellite Modem Options The AIS is detected in the receive data and reported to the M&C. The M&C control inserts AIS into the TX data path. The receive data and selected clock are translated to conform to the G.703 interface, and output through the baseband loopback relay.

  • Page 237: Figure A-10. Idr Interface Block Diagram

    Options SDM-300A Satellite Modem Figure A-10. IDR Interface Block Diagram A–48 Rev. 4...

  • Page 238: Idr Specifications

    SDM-300A Satellite Modem Options A.1.5.1 IDR Specifications Refer to Table A-15 for IDR specification. Table A-15. IDR Specification Primary Data Rates Supported G.703 1544 kbit/s 2048 kbit/s Engineering Service Channel ESC Audio 2 channels at 32 kbit/s duplex ADPCM channel...

  • Page 239: Idr Modem Defaults

    Options SDM-300A Satellite Modem A.1.5.2 IDR Modem Defaults Refer to Table A-16 for IDR modem defaults. Table A-16. IDR Modem Defaults Modulator Demodulator Data Rate Data Rate TX Rate A 1640 kbit/s, QPSK 3/4 RX Rate A 1640 kbit/s, QPSK 3/4...
  • Page 240 SDM-300A Satellite Modem Options 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). The data is scrambled synchronously with the multiframe sync in the multiplexer.

  • Page 241: Figure A-11. Ibs Interface Block Diagram

    Options SDM-300A Satellite Modem Figure A-11. IBS Interface Block Diagram A–52 Rev. 4...

  • Page 242: Ibs Specification S

    SDM-300A Satellite Modem Options A.1.5.3 IBS Specification s Refer to Table A-17 for IBS specifications. Table A-17. IBS Specifications Parameter Specification Composite Data Rates Supported N x 64 kbit/s from 64 kbit/s to 2048 kbit/s, with 1/15 overhead Primary Data Circuits Supported G.703 1.544 Mbit/s SD, RD...

  • Page 243: Ibs Modem Defaults

    Options SDM-300A Satellite Modem A.1.5.4 IBS Modem Defaults Refer to Table A-18 for IBS modem defaults. Table A-18. IBS Modem Defaults Modulator Demodulator Data Rate Data Rate TX Rate A 64 kbit/s, QPSK 1/2 RX Rate A 64 kbit/s, QPSK 1/2...

  • Page 244: A.1.6 Asymmetrical Loop Timing

    SDM-300A Satellite Modem Options A.1.6 Asymmetrical Loop Timing Asymmetrical Loop Timing is the same timing method that is designed into the SDM-650B TROJAN interfaces. Refer to Figure A-12 and Figure A-13 for TX and RX Asymmetrical Loop Timing block diagram. There are two advantages for using Asymmetrical Loop Timing: •...

  • Page 245: Figure A-12. Transmit Section Of The Asymmetrical Loop Timing Block Diagram

    Options SDM-300A Satellite Modem R XC IN T D DS R EF O U TPU T 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)

  • Page 246: Figure A-13. Receive Section Of The Asymmetrical Loop Timing Block Diagram

    SDM-300A Satellite Modem Options R XD R XD B UF R XC IN T S AT E XT IN T D D S P LL R EF TE R R E XT Note: PLL will be bypassed when the RX data rate is set to the TX data rate. This will disable the Asymmetrical Mode.

  • Page 247: A.1.7 G.703

    Options SDM-300A Satellite Modem Slave Site: 1. Set Configuration/Interface/Loop Timing to ON. 2. Set Configuration/Interface/TX Clock Source to SCT (LOOP) TX Terrestrial, Only if the user equipment can provide the proper slaved clock to the modem. 3. Set Configuration/Interface/Buffer Clock to RX Satellite (Buffer Bypass).

  • Page 248: G.703 Specifications

    SDM-300A Satellite Modem Options A.1.7.1 G.703 Specifications Refer to Table A-19 G.703 specifications. Table A-19. G.703 Specifications Parameter Specification Primary Data Circuits Supported T1 SD, RD E1 SD, RD Interface Type Transformer coupled symmetrical pair Data Rates T1 1544 kbit/s ± 100 bit/s E1 2048 kbit/s ±...

  • Page 249: Conventional Options

    Options SDM-300A Satellite Modem Conventional Options A.2.1 Reed-Solomon Codec The modem must have the Reed-Solomon PCB installed to access this feature. The Reed-Solomon Codec PCB is a 4.75” x 6.00” (12.07 x 15.24 cm) daughter card that is located on the main PCB (Figure A-14).

  • Page 250: Specifications

    SDM-300A Satellite Modem Options The Reed-Solomon Codec works in conjunction with the Viterbi decoder and includes additional framing, interleaving, and Codec processing to provide concatenated FEC and convolutional encoding and decoding. Refer to Figure A-15 for a block diagram of the Reed-Solomon Codec.

  • Page 251: Theory Of Operation

    Options SDM-300A Satellite Modem A.2.1.2 Theory of Operation The Reed-Solomon Codec works in conjunction with the interface card to provide concatenated convolutional encoding and decoding. The two main sections of the Codec are: • Reed-Solomon encoder (Section A.2.1.3) • Reed-Solomon decoder (Section A.2.1.4) A.2.1.3...
  • Page 252 SDM-300A Satellite Modem Options The data and clock signals (MUXDATA and MUXCLK) come from the multiplexer on the main PCB, and are sent to the Reed-Solomon encoder section. Since the data input to the Reed-Solomon encoder is serial, the data passes through a self-synchronizing serial scrambler, in accordance with INTELSAT-308 Rev.

  • Page 253: Figure A-17. Reed-Solomon Code Page Format

    Options SDM-300A Satellite Modem T E R R E S TR IA L R S C O D E D ATA R ATE (n ,k,t) 'R S W O R D ' 1 54 4 (164 0) 2 2 5, 2 05 , 10...

  • Page 254: Reed-Solomon Decoder

    SDM-300A Satellite Modem Options A.2.1.4 Reed-Solomon Decoder Refer to Figure A-18 for a block diagram of the Reed-Solomon decoder section. The Reed-Solomon decoder section includes the following circuits: • Serial/Parallel Converter • RAM Deinterleaver • Parallel/Serial Converter • Reed-Solomon Codec (decoder section) •...
  • Page 255 Options SDM-300A Satellite Modem Refer to Figure A-17 for the Reed-Solomon code page format. The outer Codec reads the data in blocks of n bytes and recalculates the check bytes that were appended by the encoder. If the recalculated data bytes do not match the check bytes received, the Codec makes the necessary corrections to the data within the data block.

  • Page 256: Unpacking

    SDM-300A Satellite Modem Options A.2.1.5 Unpacking This equipment contains parts and assemblies sensitive to damage by ESD. Use ESD precautionary procedures when touching, removing, or inserting PCBs. CAUTIO N 1. Remove the Reed-Solomon PCB and mounting hardware from the cardboard caddypack and anti-static material.

  • Page 257: Figure A-19. Reed-Solomon Codec Installation

    Options SDM-300A Satellite Modem Figure A-19. Reed-Solomon Codec Installation A–68 Rev. 4...

  • Page 258: Software And Hardware Installation/Upgrades

    SDM-300A Satellite Modem Options Software and Hardware Installation/Upgrades A.3.1 Overhead Interface PCB Installation The overhead interface PCB may 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 259: Installation

    Options SDM-300A Satellite Modem A.3.1.1 Installation This equipment contains parts and assemblies sensitive to damage by ESD. Use ESD precautionary procedures when touching, removing, or inserting PCBs. CAUTIO N The following tool is required to install the overhead interface PCB:...

  • Page 260: Figure A-20. Overhead Interface Pcb Installation

    SDM-300A Satellite Modem Options Figure A-20. Overhead Interface PCB Installation Rev. 4 A–71...

  • Page 261: A.3.2 Hardware Upgrades

    Options SDM-300A Satellite Modem A.3.2 Hardware Upgrades A.3.2.1 Main PCB The main PCB has two field-changeable firmware chips. If necessary, these chips can be removed and new chips added to allow for additional options, enhancements, or repairs. Currently, there are no foreseeable requirements for this task. See Figure A-21. for the locations of the field-changeable chips.

  • Page 262: Overhead Interface Pcb

    SDM-300A Satellite Modem Options A.3.2.2 Overhead Interface PCB The overhead interface PCB has four field-changeable firmware chips. If necessary, these chips can be removed and new chips added to allow for additional options, enhancements, or repairs. Currently, there are no foreseeable requirements for this task.

  • Page 263: A.3.3 8-Channel Multiplexer Option

    I/O card to provide a 100-pin subminiature D style connector located on the rear panel of the SDM-300A modem. Tributary and aggregate data is available at this 100-pin connector. An optional breakout panel (UB-54) can be used to provide eight separate 15-pin D connectors for individual tributary circuits and one 15-pin D connector for auxiliary circuits.

  • Page 264: Installation

    SDM-300A Satellite Modem Options A.3.3.1 Installation The following tool is required to install the 8-Channel Mux PCB: Description Application Phillips  Screwdriver To remove and replace cross-point screws. Install the 8-Channel Mux PCB as a daughter card (Figure A-24) on the main PCB as...

  • Page 265: Figure A-24. 8-Channel Multiplexer Installation

    Options SDM-300A Satellite Modem Figure A-24. 8-Channel Multiplexer Installation A–76 Rev. 4...

  • Page 266: Specifications Summary

    SDM-300A Satellite Modem Options A.3.3.2 Specifications Summary Refer to Table A-21 and Table A-22 for specification summary and MUX data for connector (J10). Table A-21. Specification Summary System Specification Number of Channels 1 to 8, the data rate for each channel is independently configurable.

  • Page 267: Table A-22. Mux Data 100-Pin Connector (J10

    Options SDM-300A Satellite Modem Table A-22. MUX Data 100-Pin Connector (J10) MUX Data 100 Pin Rear Panel Connector (J10) Pin # Circuit Description Pin # Circuit Description GROUND TC232_5 EIA-232, TX CLK, TRIB5 TD232_5 EIA-232, TX DAT, TRIB5 CTS232_5 EIA-232, CTS, TRIB5...

  • Page 268: A.3.4 Flex Mux

    SDM-300A Satellite Modem Options A.3.4 Flex Mux Flex Mux (Figure A-25) PCB is offered as a factory or field installable interface. Simultaneous operation of a main data channel and three overhead channels are supported. The main data channel is a G.703 type electrical interface at E1 (2048 kbit/s) or T1 (1544 kbit/s) terrestrial data rate and supports both pass through and D&I modes of...

  • Page 269: Figure A-25. Flex Mux (As/6450

    Options SDM-300A Satellite Modem Figure A-25. Flex Mux (AS/6450) Table A-23. System Specification System Specification Number of Channels 1 to 4, Each Channel is independently configurable. User Channel #1 G.703 E1 with Nx64 kbit/s channels. Drop and Insert G.703T 1 with Nx64 kbit/s channels.
  • Page 270 SDM-300A Satellite Modem Options Table A-24. Multiplexer Specification Multiplexer Specific Specifications Channel # 1 Satellite Data Rates E1 Data Rates N = 1 through 6, 8, 10, 12, 15, 16, 20, 24 or 30 (E1_CCS) N = 1, 2, 3, 4, 6, 8, 12, 16, 24, 30 (E1_CAS)

  • Page 271: Table A-25. Demultiplexer Specific Specifications

    Options SDM-300A Satellite Modem Table A-25. Demultiplexer Specific Specifications Demultiplexer Specific Specifications Channel # 1 Satellite Data Rates E1 Data Rates (N x 64 kbit/s) N = 1 through 6, 8, 10, 12, 15, 16, 20, 24 or 30 (E1_CCS)

  • Page 272: Installation

    SDM-300A Satellite Modem Options A.3.4.1 Installation The following tool is required to install the Flex Mux PCB: Description Application Phillips  Screwdriver To remove and replace cross-point screws. Install the Flex Mux PCB as a daughter card (Figure A-26) on the main PCB as follows: The equipment contains parts and assemblies sensitive to damage by Electrostatic Discharge (ESD).

  • Page 273: Figure A-26. Flex Mux Multiplexer Installation

    Options SDM-300A Satellite Modem Figure A-26. Flex Mux Multiplexer Installation A–84 Rev. 4...

  • Page 274: Pin Assignment

    SDM-300A Satellite Modem Options A.3.4.2 Pin Assignment Refer to Table A-26 for 50-pin connector pin assignments. Table A-26. 50-Pin Connector Pin Assignments D&I DB50 DB37 DB15** DB25 DB9*** V.35 1, 2 1,19, 20,37 AGC–OUT AGC–OUT AGC–OUT SD–A G.703 SD–A DDI–A SD–B...
  • Page 275 Options SDM-300A Satellite Modem This page is intentionally left blank. A–86 Rev. 4...

  • Page 276: Appendix B. Remote Control Operation

    Appendix B. REMOTE CONTROL OPERATION This appendix describes the remote control operation of the SDM-300A. • Firmware number: FW/6535-1G • Software version: 5.1.3 Note: The firmware referenced in this manual may be an earlier version of the actual firmware supplied with the unit.

  • Page 277: Message Structure

    Remote Control Operation SDM-300A Satellite Modem 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) ! 8 information bits (None) •...

  • Page 278: Command/Response

    SDM-300A Satellite Modem Remote Control Operation B.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 279: Configuration Commands/Responses

    Remote Control Operation SDM-300A Satellite Modem Configuration Commands/Responses B.3.1 Modulator Configuration Commands Modulator Command: <add/MF_nnn.nnnnnn'cr' Where: nnn.nnnnnn = Frequency in MHz, 50.000000 to Frequency Response: >add/MF_nnn.nnnnnn'cr' 180.000000 in 1 Hz steps. RF_OFF'cr''lf'] Note: When the modulator frequency is programmed, the Status: <add/MF_'cr'...
  • Page 280 SDM-300A Satellite Modem Remote Control Operation Scrambler Command: <add/SE_xxx’cr’ Where: xxx = ON or OFF. Enable Response: >add/SE_xxx’cr’’lf’] Status: <add/SE_’cr’ Response: >add/SE_xxx’cr’’lf’] Differential Command: <add/DENC_xxx’cr’ Where: xxx = ON or OFF. Encoder Response: >add/DENC_xxx’cr’’lf’] Enable Status: <add/DENC_’cr’ Response: >add/DENC_xxx’cr’’lf’] Modulator Command: <add/MT_xxxx’cr’...

  • Page 281: Demodulator Configuration Commands

    Remote Control Operation SDM-300A Satellite Modem TX 8PSK Command: <add/T310_xxx’cr’ Where: xxx = ON or OFF. Response: >add/T310_xxx’cr’’lf’] IESS-310 Operation Status: <add/T310_’cr’ Response: >add/T310_xxx’cr’’lf’] B.3.2 Demodulator Configuration Commands Command: <add/DF_nnn.nnnnnn'cr' Where: nnn.nnnnnn = Frequency in MHz, 50.000000 to Demodulato Response: >add/DF_nnn.nnnnnn'cr''lf']...
  • Page 282 SDM-300A Satellite Modem Remote Control Operation Sweep Command: <add/SCF_snnnnn'cr' Where: snnnnn = -35000 to +35000, in 1 Hz steps. Center Response: >add/SCF_snnnnn'cr''lf'] Frequency Status: <add/SCF_'cr' Response: >add/SCF_snnnnn'cr''lf'] Sweep Command: <add/SWR_nnnnn'cr' Where: nnnnn = 0 to 70000, in 1 Hz steps.

  • Page 283: Interface Configuration Commands

    Remote Control Operation SDM-300A Satellite Modem B.3.3 Interface Configuration Commands Interface Command: <add/ITOT_xxxxx'cr' Where: xxxxx = NONE, IDR, IBS, DI, ASYNC, or FLEX. Transmit Response: >add/ITOT_xxxxx'cr''lf'] Overhead Type Status: <add/ITOT_'cr' Response: >add/ITOT_xxxxx'cr''lf'] Interface Command: <add/IROT_xxxxx'cr' Where: xxxxx = NONE, IDR, IBS, DI, ASYNC, or FLEX.
  • Page 284 SDM-300A Satellite Modem Remote Control Operation Interface Command: <add/ILB_xxx'cr' Where: xxx = ON or OFF. Loopback Response: >add/ILB_xxx'cr''lf'] Status: <add/ILB_'cr' Response: >add/ILB_xxx'cr''lf'] Interface Command: <add/ILT_xxx'cr' Where: xxx = ON or OFF. Loop Response: >add/ILT_xxx'cr''lf'] Timing Status: <add/ILT_'cr' Response: >add/ILT_xxx'cr''lf'] Interface Buffer size programming is supported in two formats;...
  • Page 285 Remote Control Operation SDM-300A Satellite Modem Interface Command: <add/ICFT_xxxx'cr' Where: xxxx = AMI, HDB3, or B8ZS. Coding Response: >add/ICFT_xxxx'cr''lf'] Format Transmit Status: <add/ICFT_'cr' Response: >add/ICFT_xxxx'cr''lf'] Interface Command: <add/ICFR_xxxx'cr' Where: xxxx = AMI, HDB3, or B8ZS. Coding Response: >add/ICFR_xxxx'cr''lf'] Format Receive Status: <add/ICFR_'cr'...
  • Page 286 SDM-300A Satellite Modem Remote Control Operation Drop Command: <add/DCA_dd;cc'cr' Where: Channels Response: >add/DCA_dd;cc'cr''lf'] Assignment dd = 1 to N (over the satellite drop channel) Status: <add/DCA_dd'cr' where N = (Modulator Data Rate) divided by Response: >add/DCA_dd;cc'cr''lf'] (64 kbit/s). cc = 1 to 24 (terrestrial channel number for T1 data formats).
  • Page 287 Remote Control Operation SDM-300A Satellite Modem Bulk Insert Command: <add/BICA_ii;cc_ii;cc_ii;cc_ii;cc..'cr' Where: Channels Response: >add/BICA_ii;cc_ii;cc_ii;cc_ii;cc..'cr''lf'] Assignment ii = 1 to N (over the satellite insert channel); Status: <add/BICA_'cr' where N = (modulator data rate) divided by Response: >add/BICA_ii;cc_ii;cc_ii;cc_ii;cc..'cr''lf'] (64 kbit/s). cc = 1 to 24 (terrestrial channel number for T1 data formats).
  • Page 288 SDM-300A Satellite Modem Remote Control Operation ASYNC Command: <add/TOCP_xxxx'cr' Where: xxxx = ODD, EVEN, or NONE. Transmit Response: >add/TOCP_xxxx'cr''lf'] Overhead Note: TX ASYNC Overhead only. Channel Status: <add/TOCP_'cr' Parity Response: >add/TOCP_xxxx'cr''lf'] ASYNC Command: <add/ROCP_xxxx'cr' Where: xxxx = ODD, EVEN, or NONE.

  • Page 289: System Configuration Commands

    Remote Control Operation SDM-300A Satellite Modem B.3.4 System Configuration Commands Time Of Command: <add/TIME_hh:mmxx'cr' Where: Response: >add/TIME_hh:mmxx'cr''lf'] hh = 1 to 12 (hours). mm = 00 to 59 (minutes). Status: <add/TIME_'cr' xx = AM or PM. Response: >add/TIME_hh:mmxx'cr''lf'] Date Command: <add/DATE_mm/dd/yyyy'cr'...

  • Page 290: Automatic Uplink Power Control (Aupc

    SDM-300A Satellite Modem Remote Control Operation RTS TX-IF Command: <add/RTSM_xxx'cr' Where: xxx = ON or OFF. Control Response: >add/RTSM_xxx'cr''lf'] Mode This command configures the modem for the RTS TX-IF Status: <add/RTSM_'cr' control mode. If 'ON' is selected, the TX-IF output will Response: >add/RTSM_xxx'cr''lf']...
  • Page 291 Remote Control Operation SDM-300A Satellite Modem AUPC Command: <add/ENSP_nn.n'cr' Where: nn.n = 3.2 to 16.0, in 0.1 increments (Eb/N0 in Eb/N0 Response: >add/ENSP_nn.n'cr''lf'] dB). Target Set Point Status: <add/ENSP_'cr' Note: ASYNC Overhead only. Response: >add/ENSP_nn.n'cr''lf'] AUPC Command: <add/MAXT_n.n'cr' Where: n.n = 0.5 to 6.0, in 0.5 increments (max tracking...

  • Page 292: Mux Pcb Configuration Commands (Mux Pcb Installed Only

    SDM-300A Satellite Modem Remote Control Operation B.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 (kbit/s in 100 bits steps).

  • Page 293: Flex Mux Configuration Commands (Flex Mux Pcb Installaed Only

    Remote Control Operation SDM-300A Satellite Modem B.3.7 Flex Mux Configuration Commands (Flex Mux PCB Installaed 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'] TX Channel Command: <add/TCDR_1_xxxx.x'cr'...
  • Page 294 SDM-300A Satellite Modem Remote Control Operation 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 295 Remote Control Operation SDM-300A Satellite Modem RX Channel Command: <add/RCDP_x_yyy'cr' Where: Data Phase Response: >add/RCDP_x_yyy'cr''lf'] (Channels x = 3 or 4 (channel number). #3 and #4) Status: <add/RCDP_x'cr' Response: >add/RCDP_x_yyy'cr''lf'] yyy = NRM (normal data phasing), INV (inverted data phasing).

  • Page 296: Status Commands/Responses

    SDM-300A Satellite Modem Remote Control Operation Status Commands/Responses B.4.1 Modulator Configuration Status Modulator Command: <add/MCS_'cr' Config. Response: >add/MCS_'cr' Status RF_xxx'cr' RF Output MF_nnn.nnnnnnn'cr' Modulator Frequency MR_nnnn_mmmm.mmm'cr' Modulator Rate AMRA_nnnn_mmmm.mmm'cr' Preset 'A' Assignment AMRB_nnnn_mmmm.mmm'cr' Preset 'B' Assignment AMRC_nnnn_mmmm.mmm'cr' Preset 'C' Assignment AMRD_nnnn_mmmm.mmm'cr'...
  • Page 297 Remote Control Operation SDM-300A Satellite Modem Modulator/ Command: <add/MCP_'cr' Coder Response: >add/MCP_'cr' Config. SMT_xxxxxxx'cr' System Modem Type Program ITOT_xxxxx'cr' Interface Transmit Overhead Type Status MOM_xxxxxxx'cr' Modem Operation Mode MT_xxxxx'cr' Modulator Type MET_xxx'cr' Modulator Encoder Type TCEN_1_xxxx'cr' (Note 6) Flex Mux TX Channel #1 Enable TCDR_1_xxxx.x'cr'...
  • Page 298 SDM-300A Satellite Modem Remote Control Operation MTDP_1_yyy'cr' (Note 5) Mux Tributary #1 Data Phase MTMD_1_yyyyy'cr' (Note 5) Mux Tributary #1 Mode MTAF_1_yyy'cr' (Note 5) Mux Tributary #1 Async Mode MTDR_2_yyyyyy'cr' (Note 5) Mux Tributary #2 Data Rate & Enable MTIT_2_yyyyy'cr'...
  • Page 299 Remote Control Operation SDM-300A Satellite Modem 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 overhead.

  • Page 300: Demodulator Configuration Status

    SDM-300A Satellite Modem Remote Control Operation B.4.2 Demodulator Configuration Status Demodulato Command: <add/DCS_'cr' r Config. Response: >add/DCS_'cr' Status DF_nnn.nnnnnnn'cr' Demodulator Frequency DR_nnnn_mmmm.mmm'cr' Demodulator Rate ADRA_nnnn_mmmm.mmm'cr' Preset 'A' Assignment ADRB_nnnn_mmmm.mmm'cr' Preset 'B' Assignment ADRC_nnnn_mmmm.mmm'cr' Preset 'C' Assignment ADRD_nnnn_mmmm.mmm'cr' Preset 'D' Assignment ADRV_nnnn_mmmm.mmm'cr'...
  • Page 301 Remote Control Operation SDM-300A Satellite Modem 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 RCEN_1_xxxx'cr' (Note 4) Flex Mux RX Channel #1 Enable RCDR_1_xxxx.x'cr'...
  • Page 302 SDM-300A Satellite Modem Remote Control Operation to collect information that is necessary to configure back-up modems. Because this command (content and/or order) can be changed at any time by EF Data, it is advisable that other commands ('DCS_' and 'ICS_', or 'BCS_') be used for M&C systems.
  • Page 303 Remote Control Operation SDM-300A Satellite Modem TCT_xxxxx'cr' (Note 5) ASYNC Transmit Communications Type ROBR_nnnnn'cr' (Note 6) ASYNC Receive Overhead Baud Rate RCCL_n'cr' (Note 6) ASYNC Receive Channel Character Length RCSB_n'cr' (Note 6) ASYNC Receive Channel Stop Bits ROCP_xxxx'cr' (Note 6)
  • Page 304 SDM-300A Satellite Modem Remote Control Operation TCEN_2_xxx'cr' (Note 8) Flex Mux TX Channel #2 Enable TCEN_3_xxxx'cr' (Note 8) Flex Mux TX Channel #3 Enable TCDR_3_xxxx.x'cr' (Note 10) Flex Mux TX Channel #3 Data Rate TCCP_3_yyy'cr' (Note 10) Flex Mux TX Channel #3 Clock Phase...
  • Page 305 Remote Control Operation SDM-300A Satellite Modem MODEM Command: <add/MFS_'cr' Faults Response: >add/MFS_'cr' Status DMD_xxx'cr' Demodulator (FLT/OK) (Summary) MOD_xxx'cr' Modulator (FLT/OK) TX_xxx'cr' Interface Transmit Side (FLT/OK) IRX_xxx'cr' Interface Receive Side (FLT/OK) CEQ_xxx'cr' Common Equipment (FLT/OK) BWAL_xxx'cr'’lf'] Backward Alarms (FLT/OK) Modulator Command: <add/MS_'cr'...
  • Page 306 SDM-300A Satellite Modem Remote Control Operation Common Command: <add/CES_'cr' 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 307: Error Performance

    Remote Control Operation SDM-300A Satellite Modem B.4.3 Error Performance Raw BER Command: <add/RBER_'cr' Where: Response: >add/RBER_xm.mE-ee'cr''lf'] x = < or > (data modifier to indicate that the error rate is less than or greater than the returned value). m.m = 1.0 to 9.9 (error rate mantissa).
  • Page 308 SDM-300A Satellite Modem Remote Control Operation Corrected Command: <add/CBEL_'cr' Where: BER Log Response: >add/CBEL_t.t;s1,s2,s3 ... sn'cr''lf'] t.t = Time between corrected BER samples in seconds Examples: [No new compiled data from last ('0.1' to '9.9'). poll] >add/CBEL_1.0'cr''lf'] ; = At least one data point has been logged.
  • Page 309 Remote Control Operation SDM-300A Satellite Modem Eb/N0 Command: <add/EBN0_'cr' Where: Status Response: >add/EBN0_xnn.ndB'cr''lf'] x = < or > (data modifier to indicate that the Eb/N0 is less than or greater than the returned value). nn.n = 1.0 to 99.9 (Eb/N0 value).

  • Page 310: Stored Faults

    SDM-300A Satellite Modem Remote Control Operation Current Command: <add/CSV_'cr' Where: Sweep Response: >add/CSV_xsnnnnn'cr''lf] Value x = < or > (data modifier to indicate that the sweep offset value is less than or greater than the returned value). s = + or - (sweep offset from center).
  • Page 311 Remote Control Operation SDM-300A Satellite Modem Interface Command: <add/ITSF_#'cr' Transmit Response: >add/ITSF_# hh:mm:ss MM/DD/YYYY'cr' Side Stored DRP_xxx'cr' D&I Drop (OK/FLT) Faults TXD_xxx'cr' Transmit Data/AIS (OK/FLT) PLL_xxx'cr' Transmit Synthesizer PLL Lock (OK/FLT) CLK_xxx'cr' Selected Transmit Clock Activity (OK/FLT) TAC1_xxx'cr' Transmit Audio Clip Channel #1 (OK/FLT)
  • Page 312 SDM-300A Satellite Modem Remote Control Operation Bulk Command: <add/BCAS_'cr' This command is similar to the 'BCS_' command, but Consol. Response: >add/BCAS_p1,p2,p3, . . . pn'cr''lf'] returns modem analog parameters. Additional status of new Analog options and features will always be appended to the end.
  • Page 313 Remote Control Operation SDM-300A Satellite Modem Bulk Command: <add/BCS_'cr' This command causes bulk modem status to be returned. Consol. Response: >add/BCS_p1,p2,p3, . . . pn'cr''lf'] To reduce the length of the response, message parameter Status data are returned without identifiers. However, parameter identification can be determined by order of return.
  • Page 314 SDM-300A Satellite Modem Remote Control Operation Bulk Consol. Status (continued) Parameter Parameter Name Description Number (Command Reference) Demodulator rate p17 = nnnn_mmmm.mmm, code rate/data rate in kbit/s. (ref. 'DR_' command). p18 = nnnn_mmmm.mmm, code rate/data rate in kbit/s. Demodulator preset A (ref.
  • Page 315 Remote Control Operation SDM-300A Satellite Modem Bulk Consol. Status (continued) Parameter Parameter Name Description Number (Command Reference) 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 316 SDM-300A Satellite Modem Remote Control Operation Bulk Consol. Status (continued) Parameter Parameter Name Description Number (Command Reference) 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 317 Remote Control Operation SDM-300A Satellite Modem Bulk Consol. Status (continued) Parameter Parameter Name Description Number (Command Reference) Demodulator Spectrum Rotation p71 = n, where 'n' is '0' (NRM), '1' (INV). (ref. 'DSR_' command). p72 = n, where 'n' is '0' (off) or '1' (on).
  • Page 318 SDM-300A Satellite Modem Remote Control Operation Bulk Consol. Status (continued) Parameter Parameter Name Description Number (Command Reference) (Note 5) ASYNC TX Channel Stop p89 = n, where 'n' is the current number of stop bits programmed. (ref. 'TCSB_' command). (Note 6)
  • Page 319 Remote Control Operation SDM-300A Satellite Modem Bulk Consol. Status (continued) Parameter Parameter Name Description Number (Command Reference) 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 320 SDM-300A Satellite Modem Remote Control Operation Bulk Consol. Status (continued) Parameter Parameter Name Description Number (Command Reference) (Note 9) p123 = nnnn.n, where 'nnnn.n' is the data rate in Kbps. TX Flex Mux Channel #3 Data Rate (ref. "TCDR_3" command).
  • Page 321 Remote Control Operation SDM-300A Satellite Modem Bulk Consol. Status (continued) 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 322 SDM-300A Satellite Modem Remote Control Operation 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 323 Remote Control Operation SDM-300A Satellite Modem Character 'h': Interface transmit side faults character 2. Bit 6 = 1 always. Bit 5 = Transmit Data/AIS. Bit 4 = Transmit Synthesizer PLL Lock. Bit 3 = Selected Transmit Clock Activity. Bit 2 = reserved.
  • Page 324 SDM-300A Satellite Modem Remote Control Operation Character 'p': Interface backward alarm status character 1. Bit 6 = 1 always. Bit 5 = TX Backward Alarm 1. Bit 4 = TX Backward Alarm 2. Bit 3 through Bit 0 = Binary representation (0 to 10) of the number of backward alarm stored faults.
  • Page 325 Remote Control Operation SDM-300A Satellite Modem Boot M&C Command: <add/BFI_'cr' Where: Firmware Response: >add/BFI_'cr' Information VER_xxx.yyy.zzz'cr' xxx.yyy.zzz = Software version number (0.0.0 to FW/nnnnnn-ddr'cr' 999.999.999). mm/dd/yy'cr''lf'] nnnnnn = Firmware number (0 to 999999). dd = Firmware dash number (0 to 99).
  • Page 326 SDM-300A Satellite Modem Remote Control Operation 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'] (- or +)
  • Page 327 Remote Control Operation SDM-300A Satellite Modem Built In Self Command: <add/BIST_xxxx'cr' Where: xxxx = OFF (self test disabled), RUN (run self test Test Response: for (OFF or AUTO): now), AUTO (run self test on power up/software restart). >add/BIST_xxxx'cr''lf'] for (RUN): >add/BIST_xxxx'cr'...

  • Page 328: Flex Mux Configuration Commands (Flex Mux Pcb Installed Only

    SDM-300A Satellite Modem Remote Control Operation Flex Mux Configuration Commands (Flex Mux PCB Installed Only) TX Channel Command: <add/TCEN_1_xxx'cr' Where: xxx = OFF (D&I Disabled), ON (D&I Enabled). #1 Enable Response: >add/TCEN_1_xxx'cr''lf'] This command enables channel #1 for D&I operation, or can Status: <add/TCEN_1'cr'...
  • Page 329 Remote Control Operation SDM-300A Satellite Modem RX Channel Command: <add/RCEN_1_xxx'cr' Where: xxx = OFF (D&I Disabled)< ON (D&I Enabled). #1 Enable Response: >add/RCEN_1_xxx'cr''lf'] This command enables channel #1 for D&I operation, or can Status: <add/RCEN_1'cr' be disabled. Response: >add/RCEN_1_xxx'cr''lf'] RX Channel Command: <add/RCEN_2_xxx'cr'...
  • Page 330 SDM-300A Satellite Modem Remote Control Operation Rev. 4 B–55...

  • Page 331: Appendix C. Specifications

    Appendix C. SPECIFICATIONS This appendix describes the SDM-300A Satellite Modem specifications. Specifications C.1.1 General Specifications Table C-1 lists the general specifications of the modem. Table C-1. General Specifications General Specifications Operating Frequency Range 50 to 180 MHz Synthesized in 1 Hz steps...
  • Page 332 Specifications SDM-300A Satellite Modem Table C-1. General Specifications (Continued) General Specifications Digital Data Rate 2.4 kbit/s to 5.0 Mbit/s in 1 bit/s steps (front panel selection) Scrambling/Descrambling Types IESS 309 (Synchronous 215) International Telephone and Telegraph Consultative Committee (CCITT) V.35...
  • Page 333 SDM-300A Satellite Modem Specifications Table C-1. General Specifications (Continued) Remote Control Specifications Serial Interface EIA-232 or EIA-485 (2- or 4-wire) Baud Rate 150 to 19200 Mbit/s Signals Controlled Transmit Frequency Receive Frequency Transmit Power Transmitter On/Off Data Rate Select RF Loopback...

  • Page 334: Modulator Specifications

    Specifications SDM-300A Satellite Modem Modulator Specifications C.2.1 Digital Data Rate Refer to Table C-2. Note: OQPSK used with Viterbi encoding is a user-option and can replace QPSK. The digital data rate is selctable in 1 bit/s steps. The modem automatically calculates and sets the symbol rate.
  • Page 335 SDM-300A Satellite Modem Specifications Table C-4. Modulator Digital Data Rate (Continued) Modulation Encoding Type Data Rate Range Type QPSK 1/2 64 kbit/s 2048 kbit/s QPSK 1/2 IBS and Reed-Solomon 64 kbit/s 2048 kbit/s QPSK 1/2 D&I 64 kbit/s 1920 kbit/s QPSK 1/2 D&I and Reed-Solomon...

  • Page 336: Modulation And Encoding Types

    Specifications SDM-300A Satellite Modem C.2.2 Modulation and Encoding Types Note: OQPSK is a user-option and can be used in place of QPSK. Table C-3 shows combinations of modulation and forward error correction (FEC) encoding types. Table C-3. Modulation and Encoding Types...

  • Page 337: Scrambling Types

    SDM-300A Satellite Modem Specifications C.2.3 Scrambling Types The operator can select one of the following scrambling types: CCITT V.35 EFData/Comstream compatible. Sequential only CCITT V.35 Intelsat modified. Viterbi only Fairchild compatible 2^15-1 Synchronous IBS, Drop & Insert, ASYNC, and IESS-310 Modified V.35...

  • Page 338: Transmit Frequency (If

    Specifications SDM-300A Satellite Modem C.2.7 Transmit Frequency (IF) The range of the output IF spectrum can be selected by the operator from 50 to 180 MHz, in 1 Hz steps. C.2.8 Frequency Reference SCT, RX Bit Clock, and IF output are locked to the Frequency Reference.

  • Page 339: Transmit If Output Switch

    SDM-300A Satellite Modem Specifications C.2.11 Transmit IF Output Switch When set to Off, no signal present at the output is greater than -60 dBm, measured in a 3 kHz bandwidth from 0 to 500 MHz. C.2.12 Transmit IF Power The TX IF power is operator selectable from -5 to -30 dBm, in 0.1 dB steps, with an accuracy of ±...

  • Page 340: Modulator Phase Error

    Specifications SDM-300A Satellite Modem C.2.16 Modulator Phase Error The modulator will have less than 2° of phase error C.2.17 Transmit IF Test Modes The operator can select the following TX IF test modes. Spurious emissions in the following test modes will be ≤ -30 dBc.

  • Page 341: Oqpsk Encoding

    SDM-300A Satellite Modem Specifications 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 at the convolutional encoder provide the desired input/output bit rates.

  • Page 342: Table C-4. Demodulator Digital Data Rated

    Specifications SDM-300A Satellite Modem Demodulator Specifications C.3.1 Digital Data Rate Refer to Table C-4. 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 343: Table C-5. Demodulation Fec Decoding

    SDM-300A Satellite Modem Specifications Table C-4. Demodulator Digital Data Rated (Continued) Modulation Decoding Type Data Rate Range Type 8PSK 2/3 512 kbit/s 2048 kbit/s 8PSK 2/3 IBS and Reed-Solomon 512 kbit/s 2048 kbit/s QPSK 1/2 D&I 64 kbit/s 1920 kbit/s QPSK 1/2 D&I and Reed-Solomon...

  • Page 344: Descrambling Types

    Specifications SDM-300A Satellite Modem C.3.3 Descrambling Types The operator can select one of the following descrambling types: CCITT V.35 EFData/Comstream compatible. Sequential only CCITT V.35 Intelsat modified. Viterbi only Fairchild compatible 2^15-1 Synchronous IBS, Drop & Insert, ASYNC, and IESS-310 Modified V.35...

  • Page 345: Qpsk Encoding

    SDM-300A Satellite Modem Specifications C.3.6.2 QPSK Encoding The demodulator converts transmitted baseband data into a modulated QPSK carrier at the following parameters: 4.8 kbit/s to 2.5 Mbit/s 1/2 rate 7.2 kbit/s to 3.75 Mbit/s 3/4 rate 8.4 kbit/s to 4.375 Mbit/s...

  • Page 346: Demodulator (Reed-Solomon Codec

    Specifications SDM-300A Satellite Modem C.3.7 Demodulator (Reed-Solomon Codec) Observe the following: • QPSK - Depth 4 (IBS, IDR, D&I) • 8PSK - Depth 4 (No Overhead, IBS, D&I) • Depth 8 (Closed Network, Async) • 8PSK - Depth 8 (IDR) C.3.8...

  • Page 347: Demodulator If Input Shape

    SDM-300A Satellite Modem Specifications C.3.13 Demodulator IF Input Shape The modem can be set to match any of the following spectral mask specifications. • INTELSAT/EUTELSAT • Closed net (EFData Comstream) • Closed net (Fairchild compatible) • Closed net (SDM-51/SDM-52) C.3.14 Channel Spacing/Adjacent Carrier Performance The modem bit error performance will be degraded ≤...

  • Page 348: Ber Performance Specifications

    Specifications SDM-300A Satellite Modem BER Performance Specifications Table C-6 lists referenced tables that reflect the Bit Energy-to-Noise Ratio (E required to achieve 10 to 10 BER. Table C-6. BER Performance Reference Tables Table Option Table C-7 Viterbi Decoder with Open Network BER Data...

  • Page 349: Table C-7. Viterbi Decoder With Open Network Ber Data

    SDM-300A Satellite Modem Specifications C.4.1 Performance with Noise, Viterbi Decoder, and Open Network Mode Refer to Figure C-1 for the Viterbi BER curves. Table C-7 lists the Viterbi specifications for the E required to achieve 10 to 10 BER for different coding configurations. All values are for operating in QPSK mode.

  • Page 350: Figure C-1. Viterbi Ber Performance Curves

    Specifications SDM-300A Satellite Modem 1/2 R ate 3/4 R ate 7/8 R ate ‘ ‘ ‘ S pe cification Figure C-1. Viterbi BER Performance Curves C–20 Rev. 4...

  • Page 351: Performance With Noise, Viterbi Decoder, And Closed Network

    SDM-300A Satellite Modem Specifications C.4.2 Performance with Noise, Viterbi Decoder, and Closed Network Refer to Figure C-2 for the Viterbi with Reed-Solomon BER curves. Table C-8 lists the Viterbi with Closed Network specifications for the E required to achieve 10 to 10 BER for different configurations.

  • Page 352: Figure C-2. Viterbi With Reed-Solomon Ber Performance Curves

    Specifications SDM-300A Satellite Modem 1/2 R a te 3/4 R a te 7/8 R a te ‘ ‘ ‘ S pe c ific ation Figure C-2. Viterbi with Reed-Solomon BER Performance Curves C–22 Rev. 4...

  • Page 353: Performance With Noise, Viterbi Decoder, And Reed-Solomon (Optional

    SDM-300A Satellite Modem Specifications C.4.3 Performance with Noise, Viterbi Decoder, and Reed-Solomon (Optional) Refer to Figure C-3 for the Viterbi decoder with Reed-Solomon BER curves. Table C-9 lists the Viterbi decoder with Reed-Solomon specifications for the E required to achieve 10 to 10 BER for different configurations.

  • Page 354: Figure C-3. Noise, Viterbi, And Reed-Solomon (Optional) Ber Performance Curves

    Specifications SDM-300A Satellite Modem 7/8 RATE 1/2 RATE 3/4 RATE SPECIFICATIONS 10.0 11.0 (dB) Figure C-3. Noise, Viterbi, and Reed-Solomon (Optional) BER Performance Curves C–24 Rev. 4...

  • Page 355: Performance With Noise, 56 Kbit/S And Sequential Decoder (Optional

    SDM-300A Satellite Modem Specifications C.4.4 Performance with Noise, 56 kbit/s and Sequential Decoder (Optional) Refer to Figure C-4 for the sequential BER curves. Table C-10 lists the sequential specifications for the E required to achieve 10 to 10 BER at 56 kbit/s. All values are for operating in BPSK and QPSK modes.

  • Page 356: Figure C-4. Sequential Ber Performance Curves (56 Kbit/S

    Specifications SDM-300A Satellite Modem 1/2 Rate 3/4 Rate 7/8 Rate SPECIFICATIONS 10.0 11.0 (dB) Figure C-4. Sequential BER Performance Curves (56 kbit/s) C–26 Rev. 4...

  • Page 357: Performance With Noise, 1544 Kbit/S And Sequential Decoder (Optional

    SDM-300A Satellite Modem Specifications C.4.5 Performance with Noise, 1544 kbit/s and Sequential Decoder (Optional) Refer to Figure C-5 for the Sequential BER curves. Table C-11 lists the sequential specifications for the E required to achieve 10 to 10 BER at 1544 kbit/s. All values are for operating in BPSK and QPSK modes.

  • Page 358: Figure C-5. Sequential Decoder Ber Performance Curves (1544 Kbit/S

    Specifications SDM-300A Satellite Modem 1/2 Rate 3/4 Rate 7/8 Rate SPECIFICATIONS 10.0 11.0 (dB) Figure C-5. Sequential Decoder BER Performance Curves (1544 kbit/s) C–28 Rev. 4...

  • Page 359: Performance With Noise At 1544 Kbit/S, Sequential Decoder, And Reed-Solomon (Optional

    SDM-300A Satellite Modem Specifications C.4.6 Performance with Noise at 1544 kbit/s, Sequential Decoder, and Reed-Solomon (Optional) Refer to Figure C-6 for the Sequential BER curves. Table C-12 lists the sequential specifications for the E required to achieve 10 to 10 BER at 1544 kbit/s.

  • Page 360: Figure C-6. Sequential Ber Curves At 1544 Kbit/S And Reed-Solomon

    Specifications SDM-300A Satellite Modem 3 /4 R ate 7 /8 R ate 1 /2 R ate ‘ ‘ ‘ S p ecificatio n Figure C-6. Sequential BER Curves at 1544 kbit/s and Reed-Solomon C–30 Rev. 4...

  • Page 361: 8Psk Performance With Noise And With/Without Reed-Solomon

    SDM-300A Satellite Modem Specifications C.4.7 8PSK Performance with Noise and With/Without Reed-Solomon Refer to Figure C-7 for the 8PSK curves. Table C-13 lists the 8PSK specification for performance with noise and with/without Reed-Solomon. All values are for operating in 8PSK mode.

  • Page 362: Figure C-7. 8Psk Ber Specification Curves (1544 Kbit/S

    Specifications SDM-300A Satellite Modem Figure C-7. 8PSK BER Specification Curves (1544 kbit/s) C–32 Rev. 4...

  • Page 363: Performance With Noise, Viterbi Decoder, And Oqpsk

    SDM-300A Satellite Modem Specifications C.4.8 Performance with Noise, Viterbi Decoder, and OQPSK Refer to Table C-14. Table C-14 lists the Viterbi and OQPSK specifications for the E required to achieve 10 to 10 BER for different configurations. Table C-14. Viterbi Decoder and OQPSK...

  • Page 364: Figure C-8. Viterbi Decoder And Oqpsk

    Specifications SDM-300A Satellite Modem 7/8 R a te 1/2 R a te 3/4 R a te ‘ ‘ ‘ S pecification Figure C-8. Viterbi Decoder and OQPSK C–34 Rev. 4...

  • Page 365: Performance With Noise, Uncoded (1/1) Bpsk, Qpsk, And Oqpsk

    SDM-300A Satellite Modem Specifications C.4.9 Performance with Noise, Uncoded (1/1) BPSK, QPSK, and OQPSK Refer to Table C-15. Table C-15 shows uncoded BPSK with scrambler/desrambler Off. Encoded QPSK and OQPSK with scrambler/descrambler and differential encoder/decoder Off. Table C-15. Uncoded (1/1) BPSK, QPSK, and OQPSK...

  • Page 366: Figure C-9. Uncoded (1/1) Bpsk, Qpsk, And Oqpsk

    Specifications SDM-300A Satellite Modem 1/1 R ate ‘ S pecifica tio n Figure C-9. Uncoded (1/1) BPSK, QPSK, and OQPSK C–36 Rev. 4...

  • Page 367: Acquisition Time

    SDM-300A Satellite Modem Specifications Acquisition Time Refer to Table C-16 for acquisition time. Table C-16. Acquisition Time Viterbi 6 dB E b /N 0 with ± ± ± ± 35 kHz Frequency Uncertainty Code Rate Data Rate T acq P (t < T acq) <...

  • Page 368: Agc Output

    Specifications SDM-300A Satellite Modem C.5.3 AGC Output A programmable DC output, proportional to the RX signal level, is located on the rear panel at 10 mA maximum (0 to 10 volts). Default Level 0 volts for –60 dBm 10 volts for –25 dBm Low Level (0V) Programmed from 0 to 10V in 0.5V increments.

  • Page 369: Transmit Clock Switching Due To Failure Of Selected Clock

    SDM-300A Satellite Modem Specifications C.6.3.1 Transmit 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. C.6.3.2 Transmit Clock Phase Adjustment The TX clock phase can be set by the operator to Normal, Inverted, or Auto mode.

  • Page 370: Receive Clock Jitter

    Specifications SDM-300A Satellite Modem C.6.3.8 Receive Clock Jitter The RX clock will have less than 2% jitter. C.6.3.9 Receive Data Phase Adjustment The RX data phase can be set by the operator to Normal or Inverted. C.6.3.10 Receive Data Stable Condition Received data will be held stable (all 1’s) at the output of the modem for the fault...

  • Page 371: Terrestrial Interface Types

    SDM-300A Satellite Modem Specifications Terrestrial Interface Types C.7.1 Universal The following interface types are available through the EIA-530 25-pin data I/O connector. • EIA-232 • V.35 • EIA-422, MIL-188-114A Optional mechanical interfaces are also available. See Chapter 2 for pinout information.

  • Page 372: Specifications

    Specifications SDM-300A Satellite Modem C.7.2 Specifications C.7.2.1 EIA-232 Specification EIA-232 Specification Circuit Supported TXD, TXC, ST, RXD, RXC, DSR, DCD, CTS, LL, RTS, MC True: 10V, ± 5V Driver Amplitude (RXD, RXC, False: -10V, ± 5V ST, CTS, DM, DSR)

  • Page 373: V.35 Specification V.10, V.11 Specification, Circuit Supported

    SDM-300A Satellite Modem Specifications C.7.2.2 V.35 Specification V.10, V.11 Specification, Circuit Supported V.35 Specification V.10, V.11 Circuit Supported SD, SCT, SCTE, RD, SCR, DSR, RLSD, RTS, CTS, MC, DSR, LL ± 0.5V-PK, ± 20% differential, into 100Ω Driver Amplitude (RD, SCR, SCTE, CTS, RLSD, DSR, SCTE) ±...

  • Page 374: Eia-449/Eia-422 Mil-188-114A Specification

    Specifications SDM-300A Satellite Modem C.7.2.3 EIA-449/EIA-422 Mil-188-114A Specification 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) Less than 100Ω, differential...

  • Page 375: Asynchronous Overhead Specification (Optional

    SDM-300A Satellite Modem Specifications Asynchronous Overhead Specification (Optional) The operator can select EIA-232 or EIA-485 for both the TX and RX asynchronous overhead data type. Primary Data Rates Supported G.703 1544 kbit/s SD, RD 2048 kbit/s SD, RD EIA-422 9.6 kbit/s to 2.048 Mbit/s V.35...

  • Page 376: Asynchronous Baud Rates

    Specifications SDM-300A Satellite Modem C.8.1 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 C.8.2 Asynchronous Overhead Data Format The operator can select the following data formats for both the transmit and receive asynchronous overhead.

  • Page 377: Aupc Carrier Loss Action

    SDM-300A Satellite Modem Specifications C.8.7 AUPC Carrier Loss Action The operator can select transmit power level to Maximum, Nominal, or Hold for both local and remote carrier loss. Note: Local carrier loss has priority over remote carrier loss. C.8.8 Remote AUPC The operator can select remote AUPC to be enabled or disabled.

  • Page 378: Intelsat Business System

    Specifications SDM-300A Satellite Modem Intelsat Business System C.9.1 IBS (Optional with Overhead Card) Refer to Table C-17 for IBS specifications. Table C-17. IBS Specifications Primary Data Rates Supported G.703 1544 kbit/s SD, RD 2048 kbit/s SD, RD EIA-422 N x 64 kbit/s SD, RD (up to 2048 kbit/s) V.35...

  • Page 379: Ibs Framing

    SDM-300A Satellite Modem Specifications C.9.4 IBS Framing Multiplexes/demultiplexes the primary data in compliance with the standard IESS-309 overhead ratio of 1/15 (4 overhead bytes per 60 data bytes) and provides the rate exchanged transmit clock to the modulator portion of the base modem.

  • Page 380: Drop And Insert

    Specifications SDM-300A Satellite Modem C.10 Drop and Insert C.10.1 D&I (Optional with Overhead Card) Refer to Table C-18 for D&I specifications. Table C-18. D&I Specifications Primary Data Rates Supported G.703 1544 kbit/s SD, RD, DDO, IDI 2048 kbit/s SD, RD, DDO, IDI...

  • Page 381: D&I Primary Data Interfaces

    SDM-300A Satellite Modem Specifications C.10.2 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 382: Intermediate Data Rate

    Specifications SDM-300A Satellite Modem C.11 Intermediate Data Rate C.11.1 IDR (Optional with Overhead Card) Refer Table C-19 for IDR specifications. Table C-19. IDR Specifications Primary Data Rates Supported G.703 1544 kbit/s SD, RD 2048 kbit/s SD, RD Engineering Service Channel...

  • Page 383: Idr Framing

    SDM-300A Satellite Modem Specifications C.11.3 IDR Framing Multiplexes in compliance with the standard IESS-308 96 kbit/s ESC overhead onto the data and provides both the data and rate exchanged clock to the modulator portion of the base modem. Performs the corresponding demultiplexing of RX satellite data received from the demodulator portion of the modem.

  • Page 384: System Specifications

    Specifications SDM-300A Satellite Modem C.12 System Specifications C.12.1 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 385: Remote Control

    SDM-300A Satellite Modem Specifications C.12.3 Remote Control All modem functions can be controlled remotely through the remote connector on the rear panel. See Appendix B for the complete command and response. Interface type: • EIA-485 (2- or-4-wire) or EIA-232 •...

  • Page 386: Master Reset

    Specifications SDM-300A Satellite Modem C.12.6 Master Reset The operator will be able to reset the entire modem. When applied, all circuits in the modem will be reset and/or re-programmed. After a soft reset, the modem will return to its configuration prior to resetting. A hard reset will return the configuration to the factory default settings.

  • Page 387: Doppler

    SDM-300A Satellite Modem Specifications C.13 Doppler Refer to Table C-21. A geo-stationary satellite should be positioned directly over the Equator and orbit with a duration of 24 hours. In practice, the Earth, Moon, and Sun’s gravity, as well as solar wind influence the exact inclination of the satellite (relative to the Equator).
  • Page 388 Specifications SDM-300A Satellite Modem This page is intentionally left blank. C–58 Rev. 4...

  • Page 389: Glossary

    Glossary The following is a list of acronyms and abbreviations that may be found in this manual. Acronym Definition Ω Ohms 16QAM 16 Quadrature Amplitude Modulation 8PSK 8 Phase Shift Keying Ampere Alternating Current Adjust Automatic Gain Control Alarm Indication Signal Amplitude Modulation ASCII American Standard Code for Information Interchange...
  • Page 390 Glossary SDM-300A Satellite Modem Electronic Industries Association Electro-Magnetic Compatibility Engineering Service Circuit or Engineering Service Channel Electrostatic Discharge External Reference Clock FIFO First in/First Out Firmware Ground Hertz (cycle per second) Input/Output Intermediate Frequency Kilohertz (10 Hertz) Liquid Crystal Display...
  • Page 391 SDM-300A Satellite Modem Glossary Terminal Timing Transistor-Transistor Logic Transmit (Transmitter) TXCLK Transmit Clock Transmit Data United States Volts Volts, Alternating Current Voltage-Controlled Oscillator Volts, Direct Current Watt Rev. 4 g–3...
  • Page 392 Glossary SDM-300A Satellite Modem This page is intentionally left blank. g–4 Rev. 4...

  • Page 393: Index

    Index 8-Channel Multiplexer Installation, A–76 AUPC Target Noise Level, C-39 8-Channel Multiplexer Option, A–1, A–74 AUPC Tracking Rate, C-39 8-Channel Multiplexer PCB (AS/5985), A–74 Automatic Uplink Power Control (AUPC), A–80, B–15 8-Channel, 100-Pin MUX Connector, 2–5 AUX 1 Connector and Pinouts (J9), 2–18 8PSK Encoding, 4–8 Auxiliary 1 Connector and Pinouts (J9), 2–18 8PSK Performance with Noise and With/Without Reed-...
  • Page 394 Index SDM-300A Satellite Modem D&I with Asynchronous Overhead Data Flow, A–11 Data I/O Connector (J8) Installation, 2–16 Data I/O Connector (J8) Removal, 2–15, 2–17 Channel Spacing/Adjacent Carrier Performance, C-31 Data I/O Interface Connector (J8), 2–8, 2–14 Clock Slip, 3–94 Decoder, 3–2, 3–49, 3–54, 3–74, 3–75, 3–80, 3–82, 3–83, Clocking Options, 3–86...
  • Page 395 SDM-300A Satellite Modem Index Fault Connector and Pinouts (J7), 2–7 IF Loopback, 3–72, 3–74, A–18, A–50, A–54, B–6, B–25, Fault Isolation, 5–2, 5–8 B–26 Fault Isolation Test Setup, 5–2 Implementation, 4–17, A–1, A–3, A–47 Faults/Alarms, 3–2, 3–5, 3–38, 3–39, 5–8, 5–12 Installation, 1–10, 2–2, 2–3, 2–4, 2–14, 2–16, 2–17, A–1,...
  • Page 396 SDM-100 Emulation Operation, 3–83 Phase Noise, C-24 SDM-100 Emulation Parameter Settings, 3–83 Plesiochronous, 3–93, 3–97, 3–98, 4–15, A–8, A–13, A–82 SDM-300A Custom Modem Defaults, 3–74, 3–75, 3–76 Plesiochronous /Doppler /Buffer, 4–15 SDM-300A Fault Tree, 5–9, 5–10, 5–11 Plesiochronous Buffer, A–8, A–13, A–82 SDM-300A Revision Emulation, 3–85...
  • Page 397 SDM-300A Satellite Modem Index SDM-6000 Emulation Operation, 3–84 Transmit Frequency Change Time, C-24 SDM-6000 Emulation Parameter Settings, 3–84 Transmit Interface Faults, 3–40, 5–15 Seconds to Bits, 3–98 Transmit Section of the Asymmetrical Loop Timing Block Self-Monitoring Local Modem AUPC Control, A–22 Diagram, A–56...
  • Page 398 Index SDM-300A Satellite Modem This page is intentionally left blank. i–6 Rev. 4...

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