Comtech EF Data SLM-7650 Installation And Operation Manual
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Comtech EF Data SLM-7650 Installation And Operation Manual

Comtech ef data satellite modem installation and operation manual
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SLM-7650
Satellite Modem
Installation and Operation Manual
Part Number MN/SLM7650.IOM
Revision 4

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Summary of Contents for Comtech EF Data SLM-7650

  • Page 1 SLM-7650 Satellite Modem Installation and Operation Manual Part Number MN/SLM7650.IOM Revision 4...

  • Page 3: Installation And Operation Manual

    Comtech EF Data is an ISO 9001 Revision 4 Registered Company. September 10, 2005 Copyright © Comtech EF Data, 2000, 2001, 2002, 2003. All rights reserved. Printed in the USA. Comtech EF Data, 2114 West 7th Street, Tempe, Arizona 85281 USA, (480) 333-2200, FAX: (480) 333-2161.

  • Page 4: Customer Support

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

  • Page 5: Table Of Contents

    Table of Contents CHAPTER 1. INTRODUCTION ................1–1 Overview..............................1–1 Description ..............................1–2 1.2.1 Definition of Modulator Functions ......................1–3 1.2.2 Definition of Demodulator Functions ......................1–3 1.2.3 Definition of Interface/M&C Functions....................1–4 1.2.4 Additional Features ..........................1–4 Operating Modes ............................1–5 Options ................................1–5 System Specifications Summary........................1–6 1.5.1 Bit Error Rate Performance with Noise ....................1–8 1.5.2...
  • Page 6 SLM-7650 Satellite Modem Revision 4 Preface MN/SLM7650.IOM CHAPTER 3. OPERATION ..................3-1 Front Panel..............................3-1 3.1.1 LED Indicators ............................3-2 3.1.2 Front Panel Keypad..........................3-2 Front Panel Operation ..........................3-3 3.2.1 Front Panel Menu Operation ........................3-3 3.2.2 Configuration ............................3-5 Digital Data Rate and Symbol Rate ......................
  • Page 7 SLM-7650 Satellite Modem Revision 4 Preface MN/SLM7650.IOM CHAPTER 4. THEORY OF OPERATION ..............4–1 Overview..............................4–1 Built in Test..............................4–1 Definitions ..............................4–3 4.3.1 Differential Encoding/Decoding ......................4–3 4.3.2 Scrambler/Descrambler..........................4–3 4.3.2.1 Self-Synchronizing Scrambler/Descrambler..................4-3 4.3.2.2 Synchronous Scrambler/Descrambler ....................4-4 4.3.3 Encoding/Decoding..........................4–4 4.3.3.1 Convolutional/Viterbi (CEVD)......................4-4 4.3.3.2 Reed-Solomon............................
  • Page 8 SLM-7650 Satellite Modem Revision 4 Preface MN/SLM7650.IOM Modem Performance Verification Tests....................5–14 5.3.1 Modulator Tests .............................5–15 5.3.1.1 Spectral Shape of the IF Output ....................... 5-15 5.3.1.2 Carrier Null ............................5-15 5.3.1.3 Spurious using a Spectrum Analyzer ....................5-16 5.3.1.4 Output Frequency..........................5-16 5.3.1.5 Power Level .............................
  • Page 9 Figures Figure 1-1. SLM-7650 Satellite Modem........................1–1 Figure 1-2. Dimensional Envelope ...........................1–8 Figure 2-1. Rear Panel ..............................2–2 Figure 3-1. SLM-7650 Front Panel........................... 3-1 Figure 3-2. Keypad ..............................3-2 Figure 3-3. Main Menu............................. 3-4 Figure 4-1. System Block Diagram ..........................4–2 Figure 4-2. User Provides Clock ..........................4–25 Figure 4-3.
  • Page 10 Table 4-6. Reed-Solomon Factor..........................4–12 Table 4-7. Delay Variations for Inclined Orbit Satellites ..................4–34 Table 4-8. Recommended Buffer Size........................4–34 Table 5-1. SLM-7650 Fault Tree..........................5–5 Table 5-2. Modulator Fault Information........................5–9 Table 5-3. Demodulator Fault Information......................5–10 Table 5-4. Transmit Interface Fault Information ....................5–11 Table 5-5.

  • Page 11: About This Manual

    MN/SLM7650.IOM About this Manual This manual describes the installation and operation for the Comtech EF Data SLM-7650 Satellite Modem. This is a technical document intended for earth station engineers, technicians, and operators responsible for the operation and maintenance of the SLM- 7650.
  • Page 12 Comtech EF Data Specifications SP/9710 Comtech EF Data Specification, SLM-7650 Satellite Modem SP/9710-1 Comtech EF Data Specification, SLM-7650 Remote Control Protocol Specification 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.
  • Page 13 Reporting Comments or Suggestions Concerning this Manual Comments and suggestions regarding the content and design of this manual will be appreciated. To submit comments, please contact the Comtech EF Data Customer Support Department. 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.

  • Page 14: Limitations Of Warranty

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

  • Page 15: Chapter 1. Introduction

    Chapter 1. INTRODUCTION This chapter provides an overview of the SLM-7650 satellite modem, referred to in this manual as “the modem.” Overview The SLM-7650 (Figure 1-1) interfaces between terrestrial fixed-rate data terminal equipment, with data rates between 9.6 kbps and 20 Mbps, and RF converter equipment that interfaces at 50 to 90 MHz and 100 to 180 MHz on the IF ports.

  • Page 16: Description

    SLM-7650 Satellite Modem Revision 4 Introduction MN/SLM7650.IOM Description The modem is a high performance, full-duplex, digital-vector, modulator/demodulator that meets the requirements of most systems encountered in the commercial and government Satellite Communications industry including: • Government/Defense • DSCS II •...

  • Page 17: Definition Of Modulator Functions

    SLM-7650 Satellite Modem Revision 4 Introduction MN/SLM7650.IOM 1.2.1 Definition of Modulator Functions The modulator section accepts data and clock from a digital signal source and after appropriate processing modulates the information on an IF carrier. The modulator provides the following functions: 1.

  • Page 18: Definition Of Interface/M&C Functions

    SLM-7650 Satellite Modem Revision 4 Introduction MN/SLM7650.IOM 1.2.3 Definition of Interface/M&C Functions The interface/M&C section consists of a device having the following identifiable functions: 1. Terrestrial Interface, defined by EIA-422 (balanced circuits) [MIL-STD-188-114A Type II and III compatible]. 2. Multiplex/Demultiplex an asynchronous data channel onto the primary data channel.

  • Page 19: Operating Modes

    Operation in this mode requires the optional ASYNC option to be activated. This is the basic closed network non-OM73 operating mode compatible with legacy-closed network Comtech EF Data modems. ASYNC This mode allows for an asynchronous overhead channel to be multiplexed and demultiplexed onto the primary data channel.

  • Page 20: System Specifications Summary

    SLM-7650 Satellite Modem Revision 4 Introduction MN/SLM7650.IOM System Specifications Summary Table 1-3. System Specifications Summary Characteristic Specification System Operating Frequency Range 50 to 90, 100 to 180 MHz, in 1 Hz steps Modulation Types Non-Turbo Modulation Types Turbo Modulation Types...
  • Page 21 SLM-7650 Satellite Modem Revision 4 Introduction MN/SLM7650.IOM Table 1-3. System Specifications Summary (continued) Characteristic Specification Coding Options Uncoded Viterbi Viterbi and Reed-Solomon Concatenated Trellis Per IESS-310 Trellis and Reed-Solomon Concatenated Turbo Tutbo product Code (TPC) Open Network Option INTELSAT IESS-308 (framing only)

  • Page 22: Bit Error Rate Performance With Noise

    SLM-7650 Satellite Modem Revision 4 Introduction MN/SLM7650.IOM 1.5.1 Bit Error Rate Performance With Noise Refer to the following tables for BER performance over the specified data rate ranges. The table values reflect specified guaranteed performance of the demodulator when operating with the associated modulator and noise. Typically the performance shall be 0.5 dB better than specified for adequate production margin.
  • Page 23 SLM-7650 Satellite Modem Revision 4 Introduction MN/SLM7650.IOM 1.5.1.2 Viterbi Decoder and Reed-Solomon BER Performance, Table 1-5. High Order Modulation Option Eb/No Performance, Viterbi Decoder and Reed- Solomon Non-Turbo Turbo 8-PSK 16-QAM 8-PSK 16-QAM 10.0 7.95 8.35 10.3 10.5 8.65 8.65 10.8...

  • Page 24: Dimensional Envelope

    SLM-7650 Satellite Modem Revision 4 Introduction MN/SLM7650.IOM 1.5.2 Dimensional Envelope Note: Dimensions are given in both inches and millimeters. Figure 1-2. Dimensional Envelope 1–10...

  • Page 25: Chapter 2. Installation

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

  • Page 26: Installation

    1. To allow proper cooling of the unit, the modem shall be positioned in a manner to allow an uninterrupted airflow around the unit, including no blockages in front of the fan assembly. 2. If there is any problem with the installation, contact Comtech EF Data’s Customer Support Department. 2.2.2 External Modem Connections Optional G.703 Card...

  • Page 27: Table 2-2. If Interface

    SLM-7650 Satellite Modem Rev. 3 Installation MN/SLM7650.IOM 2.2.2.2 IF Connection: Transmit and Receive Table 2-2. IF Interface Connector Name Connector Type Tx IF TNC 50 Ω (optional BNC Ω) Rx IF TNC 50 Ω (optional BNC Ω) 2.2.2.3 External Reference Input...

  • Page 28: Table 2-5. Terrestrial Data Interface 25-Pin D Female (Optional)

    SLM-7650 Satellite Modem Rev. 3 Installation MN/SLM7650.IOM Table 2-5. Terrestrial Data Interface 25-Pin D Female (Optional) Pin # Signal Name Pin # Signal Name RTSA CTSA RTSB EXC/MCA EXC/MCB CTSB 2.2.2.5 Remote Control Interface (M&C) Table 2-6. Remote Control Interface (M&C)

  • Page 29: Table-2-7. Asynchronous Data Interface

    SLM-7650 Satellite Modem Rev. 3 Installation MN/SLM7650.IOM 2.2.2.6 Asynchronous Data Interface Table-2-7. Asynchronous Data Interface Asynchronous Interface, 9-Pin D Female, DCE EIA-485 (4-Wire) EIA-485 (2-Wire) EIA-232 Pin # Signal Name Pin # Signal Name Pin # Signal Name +TX/+RX -TX/-RX...

  • Page 30: Table 2-9. 50 Pin Sub-D Female Interface Connector

    SLM-7650 Satellite Modem Rev. 3 Installation MN/SLM7650.IOM 2.2.2.8 G.703 Overhead Option Card Connections 2.2.2.8.1 50-Pin Interface Connector Table 2-9. 50-Pin Sub-D Female Interface Connector 50-Pin Sub-D Female Pin # ASYNC / Normal D&I 1, 2 AGC (O) AGC (O) AGC (O)

  • Page 31: Table 2-10. 15-Pin Sub-D Female (G.703 Balanced)

    SLM-7650 Satellite Modem Rev. 3 Installation MN/SLM7650.IOM 2.2.2.8.2 15-Pin Connector (G.703 Balanced) Table 2-10. 15-Pin Sub-D Female (G.703 Balanced) 15 Pin Sub-D Female Pin # G.703 (Non-D&I) D&I SD_A G.703 (I) DDI_A G.703 (I) SD_B G.703 (I) DDI_B G.703 (I) DDO_A G.703 (O)
  • Page 32 SLM-7650 Satellite Modem Rev. 3 Installation MN/SLM7650.IOM This page is intentionally blank. 2–8...

  • Page 33: Chapter 3. Operation

    Appendix B. Front Panel The modem front panel (Figure 3-1) enables the user to control modem configuration parameters and display the modem status. Figure 3-1. SLM-7650 Front Panel The front panel features include: • 24-character, 2-line LCD display •...

  • Page 34: Led Indicators

    SLM-7650 Satellite Modem Revision 4 Operation MN/SLM7650.IOM 3.1.1 LED Indicators The 8 LEDs on the front panel indicate general modem summary fault information and status. The indicators are defined as follows in Table 3-1: Table 3-1. Front Panel Indicators Name...

  • Page 35: Front Panel Operation

    SLM-7650 Satellite Modem Revision 4 Operation MN/SLM7650.IOM Table 3-2. Keypad Functions Function [ENTER] This key is used to select a displayed function, or to execute a modem configuration change. [CLEAR] This key is used to back out of a selection, or to cancel a configuration change, which has not been executed using [ENTER].

  • Page 36: Figure 3-3. Main Menu

    SLM-7650 Satellite Modem Revision 4 Operation MN/SLM7650.IOM SLM-765 0 "TYPE" VER:2.1.3 FUNCTION FUNCTION FUNCTION FUNCTION FUNCTION FUNCTION SELE CT SELE CT SELE CT SELE CT S TORED SELE CT SELE CT UTILITY MONITOR FAULTS/ALARMS FAULTS/ALARMS CONFIGURATION REMOTE AUP C STORED...

  • Page 37: Configuration

    SLM-7650 Satellite Modem Revision 4 Operation MN/SLM7650.IOM Notes: 1. Operating mode selections and hardware configuration may change the front panel menu selection. 2. Parameters that are specific to certain modem configurations are only accessible after selecting the appropriate modem configuration. This prevents incompatible parameters from accidentally being selected.

  • Page 38: Digital Data Rate And Symbol Rate

    SLM-7650 Satellite Modem Revision 4 Operation MN/SLM7650.IOM Digital Data Rate and Symbol Rate The digital data rate is selectable in 1 bit/s increments, from 9.6 kbps to 20.0 Mbps depending on modulation type, code rate, and overhead. The symbol rate range is 9.6 kS/s to 10.0 MS/s, and is a limiting factor to data rate.
  • Page 39 SLM-7650 Satellite Modem Revision 4 Operation MN/SLM7650.IOM Operating Mode Modulation/Coding FEC/Overhead Type Min DR (kbps) Max DR (Mbps) 7650-02, Async QPSK, OQPSK 1/2 Viterbi and R-S, Async 9.60 8.448 7650-02, Async QPSK, OQPSK 3/4 Viterbi and R-S, Async 12.30 8.448...

  • Page 40: Menus

    SLM-7650 Satellite Modem Revision 4 Operation MN/SLM7650.IOM Menus 3.4.1 Configuration Menu 3.4.1.1 Modulator Menu Menu Item Specifications/usage TX-DR Filter: A, B, C, D, or V Data Rate, Code Rate, and Modulation Type Data rates are referenced in Paragraph 3.3 On entry, the current transmitter rate is displayed with the flashing cursor on the first character of the code rate on line 1.
  • Page 41 SLM-7650 Satellite Modem Revision 4 Operation MN/SLM7650.IOM Menu Item Specifications/usage SCRAMBLER Programs the scrambler On or Off. On entry, the current status of the scrambler is displayed. Press an arrow key to make the selection. Press [ENTER] to execute the change.

  • Page 42: Demodulator Menu

    SLM-7650 Satellite Modem Revision 4 Operation MN/SLM7650.IOM 3.4.1.2 Demodulator Menu Menu Item Specifications/usage RX-DR Filter: A, B, C, D, or V Data Rate, Code Rate, and Modulation Type Data rates are referenced in paragraph 3.3. On entry, the current receiver rate is displayed with the flashing cursor on the first character of the code rate on line 1.
  • Page 43 SLM-7650 Satellite Modem Revision 4 Operation MN/SLM7650.IOM Menu Item Specifications/usage SWEEP CENTER Programs the sweep center frequency for the directed sweep function. The sweep center frequency can be set in the range from -35000 to +35000 Hz. On entry, the current programmed setting is displayed with a flashing cursor on the first character.

  • Page 44: Interface Menu

    SLM-7650 Satellite Modem Revision 4 Operation MN/SLM7650.IOM 3.4.1.3 Interface Menu Menu Item Specifications/usage TX CLOCK SOURCE Programs the clock source for the modem transmitter clock to the following configurations: TX Terrestrial: Selecting TX Terrestrial will clock the data to the encoder using the customer terrestrial clock.
  • Page 45 SLM-7650 Satellite Modem Revision 4 Operation MN/SLM7650.IOM Menu Item Specifications/usage EXT MASTER CLOCK Programs the external master clock input frequency between 9.6 kHz and 20 MHz. FREQUENCY The data rate of the external master clock input will need to be entered by the user to match the expected rate at the input to the modem at the data I/O connector.
  • Page 46 SLM-7650 Satellite Modem Revision 4 Operation MN/SLM7650.IOM Menu Item Specifications/usage B-BAND LOOPBACK Programs the modem for baseband loopback operation. Baseband loop back will turn around the data and clock to the user at the terrestrial interface of the modem. This is a bi-directional loop so the data and clock over the (Test Mode Configuration) satellite is also turned around.
  • Page 47 SLM-7650 Satellite Modem Revision 4 Operation MN/SLM7650.IOM Menu Item Specifications/usage RX 2047 PATTERN Programs the modem to monitor a test pattern. Selections are as follows: See the options for TX 2047 Pattern. (Test Mode Configuration) The 2047 Errors menu choice under the Monitor menu will report Bit Error Rate if a 2047 pattern is being received by the demod and this option is set to 2047.
  • Page 48 SLM-7650 Satellite Modem Revision 4 Operation MN/SLM7650.IOM Menu Item Specifications/usage DROP CHANNEL Drop Channel Assignments: Maps terrestrial time slots to transmit satellite channels. ASSIGNMENTS Terrestrial time slots: T1 = 1 to 24 E1 (CCS) = 1 to 31 E1 (CAS) = 1 to 15 and 17 to 31 Channels: 1 to N (N = Satellite Data Rate ÷...
  • Page 49 SLM-7650 Satellite Modem Revision 4 Operation MN/SLM7650.IOM Menu Item Specifications/usage ASYNC TX Programs the baud rate settings and interface format of ASYNC overhead in the modem. To change the ASYNC overhead baud rate (110 to 38400 bps), press [ENTER]. Press ] or [ ] to position the cursor over the baud rate parameter.

  • Page 50: Local Aupc Menu

    SLM-7650 Satellite Modem Revision 4 Operation MN/SLM7650.IOM 3.4.1.4 Local AUPC Menu The Local AUPC menu is used to configure the Automatic Uplink Power Control parameters for a Duplex or Simplex (Broadcast) link. This menu will only be displayed if the modem is programmed to a mode that requires AUPC functionality. Within the Utility: Modem Type menu, selection of Modem Types 7650-02 or ASYNC or programming the Local Modem AUPC to ON will activate this display.

  • Page 51: Save Menu

    SLM-7650 Satellite Modem Revision 4 Operation MN/SLM7650.IOM 3.4.1.5 Save Menu The Configuration Save menu allows the user to program 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. This feature speeds up the configuration process by allowing faster configuration changes.

  • Page 52: Monitor Menu

    SLM-7650 Satellite Modem Revision 4 Operation MN/SLM7650.IOM 3.4.2 Monitor Menu The Monitor level is accessible from the Function Select menu. The Monitor menu provides information on the link performance of the demodulator. 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 53: Faults/Alarms Menu

    SLM-7650 Satellite Modem Revision 4 Operation MN/SLM7650.IOM 3.4.3 Faults/Alarms Menu The Faults/Alarms level 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 Fault/Alarm groups: •...

  • Page 54: Modulator Faults

    SLM-7650 Satellite Modem Revision 4 Operation MN/SLM7650.IOM 3.4.3.1 Modulator Faults Menu Item Specifications/usage MODULE Modulator section fault. Typically indicates that the modulator section will not program. IF SYNTHESIZER Modulator IF synthesizer fault. DATA CLOCK SYNTH Transmit symbol clock lock detect. Indicates that the symbol clock is not locked.

  • Page 55: Transmit Interface Faults

    SLM-7650 Satellite Modem Revision 4 Operation MN/SLM7650.IOM 3.4.3.3 Transmit Interface Faults Menu Item Specifications/usage MODULE TX Interface section fault. Typically indicates that the TX Interface section will not program. TX DATA/AIS Data or AIS. When DATA fault is selected in the Configuration Interface menu, the fault indicates a data stable condition.

  • Page 56: Common Equipment Faults

    SLM-7650 Satellite Modem Revision 4 Operation MN/SLM7650.IOM 3.4.3.5 Common Equipment Faults Fault Cause MODULE Interface/M&C section summary fault. Typically indicates that the interface section will not program or the M&C has failed BATTERY/CLOCK Battery or clock fault. -12V SUPPLY -12V power supply fault.

  • Page 57: Stored Faults/Alarms Menu

    SLM-7650 Satellite Modem Revision 4 Operation MN/SLM7650.IOM 3.4.4 Stored Faults/Alarms Menu The Stored Faults/Alarms level is accessible from the Function Select menu. The modem stores the first 10 (Flt0 through Flt9) occurrences of fault status changes in each of the following major fault categories: •...

  • Page 58: Remote Aupc Menu

    SLM-7650 Satellite Modem Revision 4 Operation MN/SLM7650.IOM 3.4.5 Remote AUPC Menu This menu will only be displayed if the modem is programmed to a mode that allows AUPC functionality. Within the Utility Modem Type menu, selection of Modem Types 7650-02 or ASYNC will activate this display.

  • Page 59: Utility Menu

    Utility functions level, press [←] or [→] to select the desired Utility menu, and press [ENTER]. The Factory Setup Utility menu is for Comtech EF Data service personnel only. Entering this menu without authorization may cause the modem to operate incorrectly.

  • Page 60: Utility Modulator Menu

    SLM-7650 Satellite Modem Revision 4 Operation MN/SLM7650.IOM 3.4.6.1 Utility Modulator Menu Menu Item Specifications/usage ASSIGN TRANSMIT Filter: A, B, C, D, or V FILTERS Data rates are referenced in paragraph 3.3. Note: These assignments are used for the selection of the TX rate in the Configuration Modulator menu.

  • Page 61: Utility Demodulator Menu

    SLM-7650 Satellite Modem Revision 4 Operation MN/SLM7650.IOM 3.4.6.2 Utility Demodulator Menu Menu Item Specifications/usage ASSIGN RECEIVER FILTERS Filter: A, B, C, D, or V Data rates are referenced in paragraph 3.3. Note: These assignments are used for the selection of the Rx rate in the Configuration Functions menu.

  • Page 62: Utility Interface Menu

    SLM-7650 Satellite Modem Revision 4 Operation MN/SLM7650.IOM 3.4.6.3 Utility Interface Menu Menu Item Specifications/usage TX OVERHEAD TYPE Select None, IDR, IBS, VSAT-IBS, IBS-309, or ASYNC for TX overhead type. Note: This parameter is only programmable when Custom is selected for modem type in the Utility menu.

  • Page 63: Utility System Menu

    SLM-7650 Satellite Modem Revision 4 Operation MN/SLM7650.IOM 3.4.6.4 Utility System Menu Menu Item Specifications/usage TIME: HH:MM:SS Time of day and date display/set function. DATE: MM/DD/YYYY The current time (24 hour clock) and date in the modem’s memory are displayed when selected. To change the modem time and/or date, press [ENTER]. Press [ ←...
  • Page 64 SLM-7650 Satellite Modem Revision 4 Operation MN/SLM7650.IOM Menu Item Specifications/usage M&C FIRMWARE Displays the M&C module firmware version. The display includes the month, day, and year. BOOT FIRMWARE Displays the BOOT module firmware version. The display includes the month, day, and year.

  • Page 65: Utility Modem Type Menu

    SLM-7650 Satellite Modem Revision 4 Operation MN/SLM7650.IOM 3.4.6.5 Utility Modem Type Menu Menu Item Specifications/usage MODEM TYPE Selects the following types of modem operation: 7650-00 7650-02 VSAT-IBS IBS-309 ASYNC CUSTOM When the modem is changed from one mode of operation to another, the modem will be reset to the default configurations of the new modem type.

  • Page 66: Modes Of Operation

    The 7650-00 mode of operation is the basic OM-73 interoperability mode. This mode is compatible with MIL-STD-188-165 Rev. – and Rev. A with some extended capability. The additional capability includes 8-PSK and 16-QAM. This mode is similar to, and compatible with, the 8650-00 mode in the Comtech EF Data SLM-8650 satellite modem. 3-34...

  • Page 67: Table 3-4. 7650-00 Default Parameters

    SLM-7650 Satellite Modem Revision 4 Operation MN/SLM7650.IOM Table 3-4. 7650-00 Default Parameters Function Configuration Modulator Demodulator Data Rate Data Rate TX-A 64 kbps QPSK 1/2 RX-A 64 kbps QPSK 1/2 TX IF Frequency 70 MHz RX-IF Frequency 70 MHz TX-IF Output...

  • Page 68: 7650-02 Operation

    SLM-7650 Satellite Modem Revision 4 Operation MN/SLM7650.IOM 3.5.2 7650-02 Operation The 7650-02 mode of operation is compatible with the 8650-02 operating mode of the SLM-8650 modem up to the 9.3 Mbps data rate limit of the SLM-8650. Operation in this mode requires the ASYNC framing option to be activated.

  • Page 69: Idr Operation

    SLM-7650 Satellite Modem Revision 4 Operation MN/SLM7650.IOM 3.5.3 IDR Operation The IDR mode of operation configures the modem for basic IDR operation without the addition of the overhead card. The IDR mode is used for open network applications operating in compliance with the IESS-308 (IDR) and IESS-310 (TCM-IDR) Intelsat standards.

  • Page 70: Table 3-6. Idr Default Parameters

    SLM-7650 Satellite Modem Revision 4 Operation MN/SLM7650.IOM Table 3-6. IDR Default Parameters Function Configuration Modulator Demodulator Data Rate Data Rate TX-A 1544 kbps QPSK 3/4 RX-A 1544 kbps QPSK 3/4 TX IF Frequency 70 MHz RX-IF Frequency 70 MHz TX-IF Output...

  • Page 71: Ibs Operation

    SLM-7650 Satellite Modem Revision 4 Operation MN/SLM7650.IOM 3.5.4 IBS Operation The IBS mode of operation configures the modem for basic IBS operation without the addition of the overhead card. The IBS mode is used for open network applications operating in compliance with the IESS-309 Intelsat standard. When the IBS mode is active, an overhead of 6.667% will be added to the selected data rates.

  • Page 72: Table 3-7. Ibs Default Parameters

    SLM-7650 Satellite Modem Revision 4 Operation MN/SLM7650.IOM Table 3-7. IBS Default Parameters Function Configuration Modulator Demodulator Data Rate Data Rate TX-A 64 kbps QPSK 1/2 RX-A 64 kbps QPSK 1/2 TX IF Frequency 70 MHz RX-IF Frequency 70 MHz TX-IF Output...

  • Page 73: Vsat-Ibs Operation

    SLM-7650 Satellite Modem Revision 4 Operation MN/SLM7650.IOM 3.5.5 VSAT-IBS Operation The VSAT-IBS mode of operation configures the modem for open and closed network applications operating in compliance with Appendix K of the IESS-309 Intelsat standard. The VSAT-IBS mode does not allow any overhead to be added to the selected data rates but requires Reed-Solomon concatenated outer coding.

  • Page 74: Table 3-8. Vsat-Ibs Default Parameters

    SLM-7650 Satellite Modem Revision 4 Operation MN/SLM7650.IOM Table 3-8. VSAT-IBS Default Parameters Function Configuration Modulator Demodulator Data Rate Data Rate TX-A 64 kbps QPSK 1/2 RX-A 64 kbps QPSK 1/2 TX IF Frequency 70 MHz RX-IF Frequency 70 MHz TX-IF Output...

  • Page 75: Ibs-309 Operation

    SLM-7650 Satellite Modem Revision 4 Operation MN/SLM7650.IOM 3.5.6 IBS-309 Operation The IBS-309 mode of operation configures the modem for basic IBS operation without the addition of the overhead card. The IBS-309 mode is used for open network applications operating in compliance with TN309.5 of the IESS-309 Intelsat standard.

  • Page 76: Table 3-9. Ibs-309 Default Parameters

    SLM-7650 Satellite Modem Revision 4 Operation MN/SLM7650.IOM Table 3-9. IBS-309 Default Parameters Function Configuration Modulator Demodulator Data Rate Data Rate TX-A 64 kbps QPSK 1/2 RX-A 64 kbps QPSK 1/2 TX IF Frequency 70 MHz RX-IF Frequency 70 MHz TX-IF Output...

  • Page 77: Async/Aupc Operation

    The interface for the selectable EIA/TIA-232/485 ASYNC data channel is on the rear panel 9-pin ASYNC connector J2. The ASYNC mode of operation is compatible with the ASYNC operating mode of any Comtech EF Data satellite modem. Operation in this mode requires the ASYNC framing option to be activated. 3-45...

  • Page 78: Table 3-10. Async/Aupc Default Parameters

    SLM-7650 Satellite Modem Revision 4 Operation MN/SLM7650.IOM Table 3-10. ASYNC/AUPC Default Parameters Function Configuration Modulator Demodulator Data Rate Data Rate TX-A 64 kbps QPSK 1/2 RX-A 64 kbps QPSK 1/2 TX IF Frequency 70 MHz RX-IF Frequency 70 MHz TX-IF Output...

  • Page 79: Efd Operation

    The EFD mode of operation is the basic closed network, non-OM-73 operating mode of the modem compatible with the EFD mode in any Comtech EF Data legacy satellite modem. The modem does not require any additional hardware installed to operate in EFD mode.

  • Page 80: Table 3-11. Efd Default Parameters

    SLM-7650 Satellite Modem Revision 4 Operation MN/SLM7650.IOM Table 3-11. EFD Default Parameters Function Configuration Modulator Demodulator Data Rate Data Rate TX-A 64 kbps QPSK 1/2 RX-A 64 kbps QPSK 1/2 TX IF Frequency 70 MHz RX-IF Frequency 70 MHz TX-IF Output...

  • Page 81: Custom Operation

    SLM-7650 Satellite Modem Revision 4 Operation MN/SLM7650.IOM 3.5.9 Custom Operation The CUSTOM mode of operation allows access to all front panels menus, including the Utility menus. When selecting this mode of operation the modem does not change the settings when from the previous operating mode. All currently programmed parameters will remain as they were.
  • Page 82 SLM-7650 Satellite Modem Revision 4 Operation MN/SLM7650.IOM This page is intentionally left blank. 3-50...

  • Page 83: Chapter 4. Theory Of Operation

    This chapter describes theory of operation for the SLM-7650. Overview The SLM-7650 is a duplex modem in a 1 RU chassis. The modem consists of three basic sub-sections. The modulator section, the demodulator section , and the baseband interface and monitor and control section.

  • Page 84: Figure 4-1. System Block Diagram

    SLM-7650 Satellite Modem Revision 4 Theory of Operation MN/SLM7650.IOM TX OVER HEAD PROGRAMMABLE UNCODED 70/140MHz SCRAMBLER MAPPER TEST PATTERN OVERHEAD OVERHEAD FORMATTING R-S ENCODER TX DE-JITTER GENERATOR INTERFACE RX OVER TX IF INTERLEAVER PRE- TX FILTERING HEAD (INTELSAT, NON- 70/140MHz...

  • Page 85: Definitions

    SLM-7650 Satellite Modem Revision 4 Theory of Operation MN/SLM7650.IOM Definitions 4.3.1 Differential Encoding/Decoding A process of manipulating the data in order to maintain bit integrity. There is a possibility that the demodulator may lock to one of the two-quadrature positions for QPSK modulation.

  • Page 86: Synchronous Scrambler/Descrambler

    SLM-7650 Satellite Modem Revision 4 Theory of Operation MN/SLM7650.IOM 4.3.2.2 Synchronous Scrambler/Descrambler The Synchronous Scrambler does not multiply errors and is very suited for framed data applications. The initial sequence of the frame may be used to start the scrambler. Because there is no error multiplication, there is a 0.2 dB BER gain for the synchronous scrambler.

  • Page 87: Reed-Solomon

    This may be due to the carrier-recovery circuits, or the synchronization threshold of the primary FEC device, or both. In the SLM-7650, and Rate 1/2 operation, this threshold is around 4 dB Eb/No. Below this value, operation is not possible, but above this value, the error performance of the concatenated RS system produces exceptionally low error rates for a very small increase in Eb/No.

  • Page 88: Trellis Coding

    SLM-7650 Satellite Modem Revision 4 Theory of Operation MN/SLM7650.IOM Care should be taken not to operate the demodulator near its sync threshold. Small fluctuations in Eb/No may cause total loss of the link, with the subsequent need for the demodulator to re-acquire the signal.

  • Page 89: Turbo Products Codec (Hardware Option)

    Turbo Codes have been developed, Turbo Convolutional Codes (TCC), and Turbo Product Codes (TPC, a block coding technique). Comtech EF Data has chosen to implement an FEC codec based on TPC. A Turbo Product Code is a 2 or 3 dimensional array of block codes.

  • Page 90: Table 4-4. Available Tpc Modes

    Theory of Operation MN/SLM7650.IOM Comtech EF Data now offers a very broad range of TPC code rates, combined with the entire range of modulation types, from BPSK to 16-QAM. Table 4-4 is a listing of all the available TPC modes and rates in the modulator.

  • Page 91: Uncoded Operation (No Fec)

    The demodulator will indicate that it is correctly locked, but the data out will not be correct. Comtech EF Data strongly cautions users when using uncoded operation. If the acquisition sweep width exceeds one quarter of the symbol rate, there is a very high probability that the demodulator will false lock.

  • Page 92: Modulation Types

    SLM-7650 Satellite Modem Revision 4 Theory of Operation MN/SLM7650.IOM 4.3.4 Modulation Types 4.3.4.1 BPSK Binary Phase Shift Keying uses vector analysis of the constellation pattern to represent one symbol per carrier phase at either 0 or 180 degrees. The rate 1/2 provides 2 symbol outputs for every input bit.

  • Page 93: 16-Qam

    SLM-7650 Satellite Modem Revision 4 Theory of Operation MN/SLM7650.IOM 4.3.4.5 16-QAM 16-phase Quaternary Amplitude Modulation The modulator generates a constellation with 16 discrete phase angle/amplitude states for 16-QAM. There is a large reduction of the symbol rate when using 16-QAM. The symbol rate for 3/4 FEC is 1/3 of the data rate.

  • Page 94: Symbol Rate Calculations

    SLM-7650 Satellite Modem Revision 4 Theory of Operation MN/SLM7650.IOM 4.3.7 Symbol Rate Calculations SR = (DR + OH) * 1/FEC * MF * RSF Symbol Rate Data Rate Overhead Rate Forward Error Correction Modulation Format Reed-Solomon Factor Overhead for IDR...

  • Page 95: Theory Of Operation

    SLM-7650 Satellite Modem Revision 4 Theory of Operation MN/SLM7650.IOM Theory of Operation 4.4.1 Modulator The modulator converts the input data and clock to a modulated Intermediate Frequency (IF) output in the frequency range of 70 +/- 20 MHz or 140 +/- 40 MHz. The modulator is controlled by commands from the M&C/Interface CCA and fault information from the...

  • Page 96: Demodulator

    SLM-7650 Satellite Modem Revision 4 Theory of Operation MN/SLM7650.IOM The modulated carrier is applied to the IF section for conversion to the correct output frequency. The spectral shape will be identical to that of the input data streams, but double-sided about the carrier frequency.
  • Page 97 SLM-7650 Satellite Modem Revision 4 Theory of Operation MN/SLM7650.IOM The modulated IF signal at 70 ± 20 MHz or 140 ± 40 MHz enters the IF section for conversion to I and Q analog baseband channels. The I and Q channels are then passed through identical anti-alias filters, offset amplifiers, and DAC.
  • Page 98 SLM-7650 Satellite Modem Revision 4 Theory of Operation MN/SLM7650.IOM The output of the vector rotation circuit is then sent to the FEC decoder or uncoded data formatter. The output of the FEC decoder is the final output of the demodulator section.

  • Page 99: Baseband Interface

    SLM-7650 Satellite Modem Revision 4 Theory of Operation MN/SLM7650.IOM The Sweep Range sets limits of the carrier loop during acquisition. The Sweep Center Frequency function allows the operator to target the demod center frequency to be offset from the assigned demodulator center frequency. The Reacquisition function is used to reduce the amount of time that is required to relock the demod in the event of a short outage or fade.
  • Page 100 SLM-7650 Satellite Modem Revision 4 Theory of Operation MN/SLM7650.IOM The IESS documents define the content of the bits within the overhead frame commonly referred to as Engineering Service Channel (ESC) data. The modem does not provide access to ESC data but sets all of the bits in a 'non-inserted' state so there is no problem interfacing into an open network earth station.
  • Page 101 SLM-7650 Satellite Modem Revision 4 Theory of Operation MN/SLM7650.IOM The option interface card when installed is integrated into the SLM7650 Monitor & Control system with access to configuration and status monitoring. Details of the option interface are included in the following sections.

  • Page 102: Agc Output

    SLM-7650 Satellite Modem Revision 4 Theory of Operation MN/SLM7650.IOM 4.4.3.2.1.4 Asynchronous Data Channel (50 pin) An asynchronous data interface accessible through the 50 pin connector is provided. The asynchronous data interface is selectable between the interface at the 50 pin connector or the interface at the modem 9 pin ASYNC data connector.
  • Page 103 SLM-7650 Satellite Modem Revision 4 Theory of Operation MN/SLM7650.IOM 4.4.3.2.1.7 IBS Overhead ESC The interface option card provides access to the IBS engineering service channels at the 50 pin connector. IBS ESC requirements are defined within IESS-309 and IESS-403. Characteristic...
  • Page 104 SLM-7650 Satellite Modem Revision 4 Theory of Operation MN/SLM7650.IOM 4.4.3.2.1.8 IDR Overhead ESC The interface option card provides access to the IDR engineering service channels at the 50 pin connector. IDR ESC requirements are defined within IESS-308 and IESS-403. Characteristic...
  • Page 105 SLM-7650 Satellite Modem Revision 4 Theory of Operation MN/SLM7650.IOM 4.4.3.2.1.9 Drop & Insert The interface option card provides Drop & Insert (D&I) functional support. The following table provides definitions for D&I. Characteristic Definitions Terrestrial Data Rates 1544.0 kbps (T1), 2048.0 kbps (E1) Terrestrial Framing G.732/G.733, G.704...

  • Page 106: Reference And Clock Distribution

    SLM-7650 Satellite Modem Revision 4 Theory of Operation MN/SLM7650.IOM 4.4.3.3 Reference and Clock Distribution 4.4.3.3.1 Modem Frequency Reference A modem frequency reference is distributed within the modem enclosure. This frequency reference is the frequency standard for all frequencies generated within the modem.

  • Page 107: Figure 4-2. User Provides Clock

    SLM-7650 Satellite Modem Revision 4 Theory of Operation MN/SLM7650.IOM 4.4.3.3.2.1 Timing Configuration #1: User Provides Clock Modem Reference clock is either INT, 1, 5, 10, or 20 MHz TX clock source = TX Terrestrial Buffer clock also is using TX Terrestrial This user is ignoring the internal modem clock and providing timing to the modem (Figure 4-2).

  • Page 108: Figure 4-3. Modem Provides Clock

    SLM-7650 Satellite Modem Revision 4 Theory of Operation MN/SLM7650.IOM 4.4.3.3.2.2 Timing Configuration #2: Modem Provides Clock Modem Reference clock is either INT, 1,5, 10, or 20 MHz TX clock source = TX terrestrial Buffer clock also is using TX Terrestrial This user is using the internal modem clock (ST) as the system clock (Figure 4-3).

  • Page 109: Figure 4-4. Modem Clocks Internally

    SLM-7650 Satellite Modem Revision 4 Theory of Operation MN/SLM7650.IOM 4.4.3.3.2.3 Timing Configuration #3: Modem Clocks Internally Modem Reference clock is either INT, 1, 5, 10, or 20 MHz TX Clock source = INT Buffer clock also is using INT This user is using the internal modem clock (ST) as the system clock (Figure 4-4).

  • Page 110: Figure 4-5. Slave Modem-Loop Timed

    SLM-7650 Satellite Modem Revision 4 Theory of Operation MN/SLM7650.IOM 4.4.3.3.2.4 Timing Configuration #4: Slave Modem-Loop Timed Master clock is at the distant end of the link. TX Clock Source = TX Terrestrial Selecting RX satellite turns Off the buffer. The user desires to clock the SD to the modem with the satellite clock.

  • Page 111: Figure 4-6. Ext Master Clock As Source

    SLM-7650 Satellite Modem Revision 4 Theory of Operation MN/SLM7650.IOM 4.4.3.3.2.5 Timing Configuration #5: EXT Master Clock as Source This example illustrates the buffer using the EXT Master clock source (Figure 4-6). The External Master clock frequency must be set in the configuration menu.

  • Page 112: Figure 4-7. User Provides Data Only

    SLM-7650 Satellite Modem Revision 4 Theory of Operation MN/SLM7650.IOM 4.4.3.3.2.6 Timing Configuration #6: User Provides Data Only Modem Reference clock is either INT 1, 5, 10, or 20 MHz TX Clock Source = Data Source Sync (X.21 operation will not have a TX terrestrial clock to the modem.) Buffer clock is set to RX satellite (OFF or Bypass) This user is generating the transmit clock from the send data (SD) (Figure 4-7).

  • Page 113: Figure 4-8. Internal Sct Clock Selection

    SLM-7650 Satellite Modem Revision 4 Theory of Operation MN/SLM7650.IOM 4.4.3.3.3 Internal Clock The Internal clock of the modem is referred to as Send Timing (ST). This clock is available as an output clock from the modem. It can use as a clock source for the data equipment if the user wants to clock the data equipment from the modem.

  • Page 114: Figure 4-9. Separate Links Vs Asymmetrical Loop Timing

    SLM-7650 Satellite Modem Revision 4 Theory of Operation MN/SLM7650.IOM 4.4.3.3.4 Asymmetrical Loop Timing (ASLT) There are operational satellite links that have specific clocking requirements that include the use of unequal data rates for transmit and receive. Asymmetrical loop timing (ASLT) is an optional loop-timing mode that will allow for one timing standard in the circuit even though the data rates are not equal.
  • Page 115 SLM-7650 Satellite Modem Revision 4 Theory of Operation MN/SLM7650.IOM 4.4.3.3.5 Buffering There are two primary purposes for a receive FIFO buffer in a satellite modem. One is to compensate for periodic changes in the receive data rate caused by the satellite movement...

  • Page 116: Table 4-7. Delay Variations For Inclined Orbit Satellites

    SLM-7650 Satellite Modem Revision 4 Theory of Operation MN/SLM7650.IOM As the satellite distance decreases, the frequency of the signal being received at the earth station will be at a slightly higher rate. If the satellite distance increases, then the receive frequency at the earth station will be at a lower rate.
  • Page 117 SLM-7650 Satellite Modem Revision 4 Theory of Operation MN/SLM7650.IOM EXAMPLE 1 - includes a factor of two to allow the buffer to start in the center and then drift in either direction. This will allow the buffer to start at any time and at any satellite position in the figure eight pattern.
  • Page 118 SLM-7650 Satellite Modem Revision 4 Theory of Operation MN/SLM7650.IOM This page is intentionally blank. 4–36...

  • Page 119: Chapter 5. Maintenance

    Scheduled equipment downtime will be required otherwise the network will be adversely affected. Comtech EF Data will provide the program and the files required for the reflash of the modem. The procedure for a USB reflash upgrade is located on the Comtech EF Data web site and will also be sent with the new upgrade files.

  • Page 120: Figure 5-1. Reflash Program Window

    SLM-7650 Satellite Modem Revision 4 Maintenance MN/SLM7650.IOM The following is a basic overview of the steps involved in an upgrade. This is not intended to be the complete procedure. Refer to the procedure provided with the upgrade for the complete and detailed instructions.

  • Page 121: Figure 5-2. Example Of Upgrade File Location

    SLM-7650 Satellite Modem Revision 4 Maintenance MN/SLM7650.IOM The program and upgrade files should be in one directory. An example of what would be contained on an upgrade CD-ROM is show in figures Figure 5-2 through Figure 5-4. Figure 5-2. Example of Upgrade File Location Figure 5-3.

  • Page 122: Fault Isolation

    The maintenance philosophy of the SLM-7650 identifies the modem is the LRU. If the modem is found to be faulty, remove the modem from the rack and return to the depot for repair.

  • Page 123: Table 5-1. Slm-7650 Fault Tree

    SLM-7650 Satellite Modem Revision 4 Maintenance MN/SLM7650.IOM Table 5-1. SLM-7650 Fault Tree PARAMETER Modulator Faults Module IF Synthesizer Data Clock Syn I Channel Q Channel AGC Level Demodulator Faults Module Carrier Detect IF Synthesizer I Channel Q Channel BER Threshold...
  • Page 124 SLM-7650 Satellite Modem Revision 4 Maintenance MN/SLM7650.IOM Table 5-1. SLM-7650 Fault Tree (Cont.) PARAMETER RX Interface Faults Module Buffer Clock PLL Buffer Clock Activity RX Data/AIS Demux Lock RX 2047 Buffer Overflow Buffer Underflow Buffer Full RX Insert IBS Backward Alarm...
  • Page 125 SLM-7650 Satellite Modem Revision 4 Maintenance MN/SLM7650.IOM Table 5-1. SLM7650 Fault Tree (Cont.) PARAMETER Backward Alarms (IDR with option card) Backward Alarm RX #1 Backward Alarm RX #2 Backward Alarm RX #3 Backward Alarm RX #4 Backward Alarm TX #1...

  • Page 126: Fault/Alarm Display And Description

    SLM-7650 Satellite Modem Revision 4 Maintenance MN/SLM7650.IOM 5.2.4 Fault/Alarm Display and Description General fault, status, and alarm information is indicated by 8 LEDs located on the modem’s front panel. The TX and RX fault LEDs are dual purpose. A lit red LED indicates a fault currently exists in the modem.

  • Page 127: Fault/Alarm Analysis

    This section describes the possible problems and trouble shooting actions for the each of the faults listed in the Fault Tree (Table 5-1). Note: Have the modem configuration and fault information available when contacting Comtech EF Data Customer Support if on-site troubleshooting efforts fail to determine the problem with the modem. 5.2.5.1 Modulator Faults Table 5-2.

  • Page 128: Demodulator Faults

    SLM-7650 Satellite Modem Revision 4 Maintenance MN/SLM7650.IOM 5.2.5.2 Demodulator Faults Table 5-3. Demodulator Fault Information Fault/Alarm Possible Problem and Action MODULE Demodulator section fault. Typically indicates that the demodulator will not program. Return the modem for repair. CARRIER DETECT Carrier detect fault.

  • Page 129: Transmit Interface Faults

    SLM-7650 Satellite Modem Revision 4 Maintenance MN/SLM7650.IOM 5.2.5.3 Transmit Interface Faults Table 5-4. Transmit Interface Fault Information Fault/Alarm Possible Problem and Action MODULE TX Interface section fault. Typically indicates that the TX Interface will not program. Return the modem for repair.

  • Page 130: Receive Interface Faults

    SLM-7650 Satellite Modem Revision 4 Maintenance MN/SLM7650.IOM 5.2.5.4 Receive Interface Faults Table 5-5. Receive Interface Fault Information Fault/Alarm Possible Problem and Action MODULE RX Interface section fault. Typically indicates that the RX Interface will not program. Return the modem for repair.

  • Page 131: Common Equipment Faults

    SLM-7650 Satellite Modem Revision 4 Maintenance MN/SLM7650.IOM 5.2.5.5 Common Equipment Faults Table 5-6. Common Equipment Fault Information Fault/Alarm Possible Problem and Action MODULE M&C/Interface section summary fault. Typically indicates that the interface module will not program or the M&C has failed.

  • Page 132: Modem Performance Verification Tests

    SLM-7650 Satellite Modem Revision 4 Maintenance MN/SLM7650.IOM Modem Performance Verification Tests However, if more detailed verification is required, Table 5-7 lists common test equipment that is generally used for modem verification. Refer to the test set up in Figure 5-5 for all of the modem verification tests.

  • Page 133: Modulator Tests

    SLM-7650 Satellite Modem Revision 4 Maintenance MN/SLM7650.IOM 5.3.1 Modulator Tests The tests listed will give reasonable assurance that the modulator section is performing to specification. The test equipment used in these test is listed in Table 5-7. 5.3.1.1 Spectral Shape of the IF Output 1.

  • Page 134: Spurious Using A Spectrum Analyzer

    SLM-7650 Satellite Modem Revision 4 Maintenance MN/SLM7650.IOM Figure 5-7. OFFSET Test Mode 5.3.1.3 Spurious using a Spectrum Analyzer 1. Continue from the previous step and change the Spectrum Analyzer frequency span to cover the frequency range of 0 to 500 MHz.

  • Page 135: Power Level

    SLM-7650 Satellite Modem Revision 4 Maintenance MN/SLM7650.IOM Figure 5-8. CENTER Test Mode 5.3.1.5 Power Level 1. Continue from the previous step and connect the IF output to a Power Meter. 2. In the Configuration -Modulator menu, set the TX Power Level to -10 dBm 3.

  • Page 136: Demodulator Tests

    SLM-7650 Satellite Modem Revision 4 Maintenance MN/SLM7650.IOM 5.3.2 Demodulator Tests The tests listed will give reasonable assurance that the demodulator section is performing to specification. The test equipment used in these test is listed in Table 5-7. All demodulator tests require connection to a known good modulator that is capable of being configured to the same operating modes as the demodulator under test.

  • Page 137: Modem Test Modes

    SLM-7650 Satellite Modem Revision 4 Maintenance MN/SLM7650.IOM 5.3.4 Modem Test Modes The modem has built in capability to assist the operator in performance verification. 5.3.4.1 IF Loopback When IF loopback is turned ON (Configuration-Demodulator menu), the demodulator input is internally connected to a sampled output from the modulator. Also the demodulator is programmed to the same IF frequency as the modulator.

  • Page 138: Base Band Loopback

    SLM-7650 Satellite Modem Revision 4 Maintenance MN/SLM7650.IOM 5.3.4.2 Base Band Loopback When baseband loopback is turned on (Configuration-Interface menu), data is looped back on the customer side of the interface. This is a bi-directional loopback of the baseband data. This test mode will verity the customer equipment and cabling between the modem and the customer equipment.

  • Page 139: Carrier Modes

    SLM-7650 Satellite Modem Revision 4 Maintenance MN/SLM7650.IOM 5.3.4.3 Carrier Modes There are three carrier test modes available in the Configuration - Modulator menu. The normal setting is Carrier mode OFF. Exiting any of the carrier test modes will turn the IF Output OFF and the operator will be required to manually turn it back ON.

  • Page 140: Reed-Solomon Correction Off

    SLM-7650 Satellite Modem Revision 4 Maintenance MN/SLM7650.IOM 5.3.4.4 Reed-Solomon Correction OFF The Reed-Solomon (R-S) decoder data error correction circuitry can be disabled without removing the overhead associated with the R-S FEC. When R-S Correction is set to OFF (Configuration-Demodulator menu) the data flow is then routed through normal data paths without R-S error corrections.

  • Page 141: Table 5-8. Conversion To S/N And E B /N 0 Chart

    SLM-7650 Satellite Modem Revision 4 Maintenance MN/SLM7650.IOM Table 5-8. Conversion to S/N and E b /N 0 Chart BPSK Q/OQPSK 8PSK 16QAM (C+N)/N Eb/No Eb/No Eb/No Eb/No Eb/No Eb/No Eb/No Eb/No Eb/No Eb/No -3.0 -1.8 -2.5 -3.0 -4.0 -4.8 -5.5 -2.1...
  • Page 142 SLM-7650 Satellite Modem Revision 4 Maintenance MN/SLM7650.IOM This page is intentionally blank. 5–24...

  • Page 143: Appendix A. Remote Control Operation

    2.1.3 Disclaimer – Remote Commands Comtech EF Data reserves the right to make changes in the remote control commands of the product described in this manual at any time without notice and without obligation to notify any person of such changes. If there are any questions regarding your equipment or the information in this manual, please contact the Comtech EF Data Customer Support Department.
  • Page 144 SLM-7650 Satellite Modem Revision 4 Remote Control Specifications MN/SLM7650.IOM Message Structure Messages on the remote link fall into the categories of commands and responses. Commands are messages that are transmitted to the modem, while responses are messages returned by the modem in response to a command.
  • Page 145 SLM-7650 Satellite Modem Revision 4 Remote Control Specifications MN/SLM7650.IOM Command/Response The command/response portion of the message contains a variable-length character sequence that conveys command and response data. If the modem receives a properly formatted message (command), which is addressed to it with valid parameters, the message will be echoed back in the response as defined by the protocol.
  • Page 146 SLM-7650 Satellite Modem Revision 4 Remote Control Specifications MN/SLM7650.IOM Configuration Commands/Responses A.8.1 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' 90.000000 and 100.000000 to 180.000000 in 1 Hz steps. RF_OFF'cr''lf'] Note: When the modulator frequency is programmed, the Status: <add/MF_'cr'...
  • Page 147 SLM-7650 Satellite Modem Revision 4 Remote Control Specifications MN/SLM7650.IOM Modulator Command: <add/SMRV_nnnnn_mmmmm.mmm'cr' Where: mmmmm.mmm = Data rate in kHz. Rate Response: >add/SMRV_nnnnn_mmmmm.mmm'cr' For CEVD FEC: nnnnn = 1/2 (QPSK 1/2), 3/4 (QPSK Variable RF_OFF'cr''lf'] 3/4), 7/8 (QPSK 7/8), BP12 (BPSK 1/2), OQ12 (OQPSK...
  • Page 148 SLM-7650 Satellite Modem Revision 4 Remote Control Specifications MN/SLM7650.IOM Solomon Response: >add/RSEN_xxx’cr’ Encoder RF_OFF’cr’’lf’] Enable Status: <add/RSEN_’cr’ Response: >add/RSEN_xxx’cr’’lf’] Transmit Command: <add/TDA_xxx’cr’ Where: xxx = NRM (STANDARD) or INV (NON- BPSK Data Response: >add/TDA_xxx’cr’’lf’] STANDARD). Ordering Status: <add/TDA_’cr’ Response: >add/TDA_xxx’cr’’lf’]...
  • Page 149 SLM-7650 Satellite Modem Revision 4 Remote Control Specifications MN/SLM7650.IOM Parameter 10: Modulator Spectrum Rotation (ref. "MSR_" command). P10 = n, where 'n' is '0', '1' (0 = NRM, 1 = INV). Parameter 11: TX IESS-310 Operation (ref. "T310_" command). P11 = n, where ,n, is '0' or '1' (0 = OFF, 1 = ON).
  • Page 150 SLM-7650 Satellite Modem Revision 4 Remote Control Specifications MN/SLM7650.IOM Parameter 30: Interface Service Channel Level TX1 (ref. “ISCL_TX1_” command). P30 = snn.n, where ‘snn.n’ is -6.0 to +8.0 in steps of 2 dB. Parameter 31: Interface Service Channel Level TX2 (ref. “ISCL_TX2_”...
  • Page 151 SLM-7650 Satellite Modem Revision 4 Remote Control Specifications MN/SLM7650.IOM Demodulator Configuration Command: <add/DF_nnn.nnnnnn'cr' Where: nnn.nnnnnn = Frequency in MHz, 50.000000 to Demodulator Response: >add/DF_nnn.nnnnnn'cr''lf'] 90.000000 and 100.000000 to 180.000000 in 1 Hz steps. Frequency Status: <add/DF_'cr' Response: >add/DF_nnn.nnnnnn'cr''lf'] Demodulator Command: <add/ADRx_nnnnn_mmmmm.mmm'cr'...
  • Page 152 SLM-7650 Satellite Modem Revision 4 Remote Control Specifications MN/SLM7650.IOM Demodulator Command: <add/DCRT_xxxx’cr’ Where: xxxx = IESS, OM73, or TURBO. Scrambler Response: >add/DCRT_xxxx’cr’’lf’] Type Status: <add/DCRT_’cr’ Response >add/DCRT_xxxx’cr’’lf’] Descrambler Command: <add/DE_xxx'cr' Where: xxx = ON or OFF. Enable Response: >add/DE_xxx'cr''lf'] Status: <add/DE_'cr'...
  • Page 153 SLM-7650 Satellite Modem Revision 4 Remote Control Specifications MN/SLM7650.IOM Demodulator Command: <add/DSR_xxx'cr' Where: xxx = NRM (normal spectrum) or INV (inverted Spectrum Response: >add/DSR_xxx'cr''lf'] spectrum). Rotation Status: <add/DSR_'cr' Response: >add/DSR_xxx'cr''lf'] Reed- Command: <add/RSDE_xxx'cr' Where: xxx = ON, OFF, or CORR_OFF.
  • Page 154 SLM-7650 Satellite Modem Revision 4 Remote Control Specifications MN/SLM7650.IOM Parameter 13: Receive clock phase (ref. "RCP_" command). P13 = n, where 'n' is '0' or '1' (0 = NRM or 1 = INV). Parameter 14: Receive data phase (ref. "RDP_" command).
  • Page 155 SLM-7650 Satellite Modem Revision 4 Remote Control Specifications MN/SLM7650.IOM Parameter 33: Demod RS Codeword (ref. "DRSC_" command). P33 = n, where: ‘n’ is ‘0’ = RS(225,205,10) depth 8, ‘1’ = RS(225,205,10) depth 4, ‘2’ = RS(219,201,9) depth 8, ‘3’ = RS(219,201,9) depth 4, ‘4’...
  • Page 156 SLM-7650 Satellite Modem Revision 4 Remote Control Specifications MN/SLM7650.IOM A.10 Interface Configuration Commands Interface Command: <add/ITOT_xxxxx'cr' Where: xxxxx = NONE, IDR, IBS, DI, ASYNC, IBS-309, or Transmit Response: >add/ITOT_xxxxx'cr' VSAT-IBS Overhead RF_OFF ‘cr’’lf’] Type Status: <add/ITOT_'cr' Response: >add/ITOT_xxxxx'cr''lf'] Interface Command: <add/IROT_xxxxx'cr'...
  • Page 157 SLM-7650 Satellite Modem Revision 4 Remote Control Specifications MN/SLM7650.IOM Interface Loop Command: <add/ILT_xxx'cr' Where: xxx = ON or OFF. Timing Response: >add/ILT_xxx'cr''lf'] Status: <add/ILT_'cr' Response: >add/ILT_xxx'cr''lf'] Interface Buffer size programming is supported in two formats; bits, or Buffer Size milli-seconds. The selected format must be chosen using the buffer programming command (IBP_).
  • Page 158 SLM-7650 Satellite Modem Revision 4 Remote Control Specifications MN/SLM7650.IOM Transmit Data Command: <add/TDF_xxxx'cr' Where: xxxx = NONE, DATA, or AIS. Fault Response: >add/TDF_xxxx'cr''lf'] Status: <add/TDF_'cr' Response: >add/TDF_xxxx'cr''lf'] Receive Data Command: <add/RDF_xxxx'cr' Where: xxxx = NONE, DATA, or AIS. Fault Response: >add/RDF_xxxx'cr''lf']...
  • Page 159 SLM-7650 Satellite Modem Revision 4 Remote Control Specifications MN/SLM7650.IOM DDO/IDI Command: <add/DIL_xxx'cr' Where: xxx = ON or OFF. Loopback Response: >add/DIL_xxx'cr''lf'] Status: <add/DIL_'cr' Response: >add/DIL_xxx'cr''lf'] 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), where n = Status: <add/DCA_dd'cr'...
  • Page 160 SLM-7650 Satellite Modem Revision 4 Remote Control Specifications MN/SLM7650.IOM Bulk Insert Command: <add/BICA_ii;cc_ii;cc_ii;cc… 'cr' Where: Channels Response: >add/BICA_ii;cc_ii;cc_ii;cc…'cr''lf'] Assignment ii = 1 to n (over the satellite insert channel), where n = Status: <add/BICA_'cr' demodulator data rate divided by 64 kbit/s.
  • Page 161 SLM-7650 Satellite Modem Revision 4 Remote Control Specifications MN/SLM7650.IOM A.10.1 Asynchronous Interface Commands ASYNC Command: <add/TOBR_nnnnn'cr' Where: nnnnn = 110, 150, 300, 600, 1200, 2400, 4800, Transmit Response: >add/TOBR_nnnnn'cr''lf'] 9600, 19200, or 38400. Overhead Baud Rate Status: <add/TOBR_'cr' Note: TX ASYNC Overhead only.
  • Page 162 SLM-7650 Satellite Modem Revision 4 Remote Control Specifications MN/SLM7650.IOM A.11 System Configuration Commands Time Of Day Command: <add/TIME_hh:mm:ss'cr' Where: Response: >add/TIME_hh:mm:ss'cr''lf'] hh = 0 to 23 (hours). mm = 00 to 59 (minutes). Status: <add/TIME_'cr' ss = 00 to 59 (seconds).
  • Page 163 SLM-7650 Satellite Modem Revision 4 Remote Control Specifications MN/SLM7650.IOM System Reset Command: <add/SYSR!_xxxx’cr’ Where: xxxx = HARD or SOFT Response: >add/SYSR!_xxxx’cr’’lf’ Note: HARD reset initializes and reprograms all modules to system default configuration values while SOFT reset initializes and reprograms all modules to currently programmed configuration values A.12...
  • Page 164 SLM-7650 Satellite Modem Revision 4 Remote Control Specifications MN/SLM7650.IOM Remote Notes: Modem AUPC 1. Always wait 3 seconds between consecutive remote modem command/status polls. Commands 2. If Local AUPC is not enabled, status commands will return last known condition. They will also request status from the remote modem.
  • Page 165 SLM-7650 Satellite Modem Revision 4 Remote Control Specifications MN/SLM7650.IOM A.13 Status Commands/Responses A.13.1 Modulator Configuration Status Modulator Command: <add/MCS_'cr' Config. Response: >add/MCS_'cr' Status RF_xxx'cr' RF Output MF_nn.nnnnnnn'cr' Modulator Frequency MR_nnnn_mmmmm.mmm'cr' Modulator Rate AMRA_nnnn_mmmmm.mmm'cr' Preset 'A' Assignment AMRB_nnnn_mmmmm.mmm'cr' Preset 'B' Assignment AMRC_nnnn_mmmmm.mmm'cr'...
  • Page 166 SLM-7650 Satellite Modem Revision 4 Remote Control Specifications MN/SLM7650.IOM Modulator / Command: <add/MCP_'cr' Coder Config. Response: >add/MCP_'cr' Program SMT_xxxxxxx'cr' System Modem Type Status RMR_'cr' Reset Mod Rate (reserved for Comtech switch) MET_xxx’cr’ Modulator Encoder Type ITOT_xxxxx'cr' Interface Transmit Overhead Type...
  • Page 167 SLM-7650 Satellite Modem Revision 4 Remote Control Specifications MN/SLM7650.IOM Notes: 1. Data is only returned for TX ASYNC Overhead 2. Data not returned if Local AUPC is enabled & TX ASYNC overhead. 3. Data is only returned for TX ASYNC Overhead Mux.
  • Page 168 SLM-7650 Satellite Modem Revision 4 Remote Control Specifications MN/SLM7650.IOM A.14 Demodulator Configuration Status Demodulato Command: <add/DCS_'cr' r Config. Response: >add/DCS_'cr' Status DF_nn.nnnnnnn'cr' Demodulator Frequency DR_nnnn_mmmmm.mmm'cr' Demodulator Rate ADRA_nnnn_mmmmm.mmm'cr' Preset 'A' Assignment ADRB_nnnn_mmmmm.mmm'cr' Preset 'B' Assignment ADRC_nnnn_mmmmm.mmm'cr' Preset 'C' Assignment ADRD_nnnn_mmmmm.mmm'cr' Preset 'D' Assignment ADRV_nnnn_mmmmm.mmm'cr'...
  • Page 169 SLM-7650 Satellite Modem Revision 4 Remote Control Specifications MN/SLM7650.IOM Demod/ Command: <add/DCP_'cr' Decoder Resp onse: >add/DCP_'cr' Config. SMT_xxxxxxx'cr' System Modem Type Program RDR_'cr' Reset Demod Rate (reserved for Comtech switch) Status DDT_xxx'cr' Demodulator Decoder Type IROT_xxxxx'cr' Interface Receive Overhead Type...
  • Page 170 SLM-7650 Satellite Modem Revision 4 Remote Control Specifications MN/SLM7650.IOM 4. Data is only returned when the option card is installed and RX Overhead is IDR. 5. Data is only returned when the option card is installed and RX Overhead is DI.
  • Page 171 SLM-7650 Satellite Modem Revision 4 Remote Control Specifications MN/SLM7650.IOM A.15 Interface Configuration Status Interface Command: <add/ICS_'cr' Config. Response: >add/ICS_'cr' Status TC_xxxx'cr' Transmit Clock (Source) ERF_nnnnnn.n'cr' External Reference Frequency TCP_xxxx'cr' Transmit Clock Phase RCP_xxxx'cr' Receive Clock Phase BBL_xxx'cr' Baseband Loopback ILT_xxx'cr'...
  • Page 172 SLM-7650 Satellite Modem Revision 4 Remote Control Specifications MN/SLM7650.IOM MAXT_n.n'cr' (Note 2) AUPC Max. Tracking Rate RTSM_xxx'cr' RTS TX-IF Control Mode TAS_xx'cr' (Note 9) Terrestrial ASYNC Source DIL_xxx'cr'’lf’] (Note 10) DDO/IDI Loopback The Interface configuration status command causes a block of data to be returned by the addressed MODEM.
  • Page 173 SLM-7650 Satellite Modem Revision 4 Remote Control Specifications MN/SLM7650.IOM A.16 Fault Status MODEM Command: <add/MFS_'cr' Faults Response: >add/MFS_'cr' Status DMD_xxx'cr' Demodulator (FLT/OK) (Summary) MOD_xxx'cr' Modulator (FLT/OK) ITX_xxx'cr' Interface Transmit Side (FLT/OK) IRX_xxx'cr' Interface Receive Side (FLT/OK) CEQ_xxx Common Equipment (FLT/OK) BWAL_xxx'cr'’lf’]...
  • Page 174 SLM-7650 Satellite Modem Revision 4 Remote Control Specifications MN/SLM7650.IOM Common Command: <add/CES_'cr' Equipment Response: >add/CES_'cr' Status M&C_xxx'cr' Controller Module (OK/FLT) BAT_xxx'cr' Battery/Clock (OK/FLT) -12V_xxx’cr’ -12 Volt Level (OK/FLT) +12V_xxx’cr’ +12 Volt Level (OK/FLT) +5V_xxx’cr’ +5 Volt Level (OK/FLT) +3.3V_xxx’cr’ +3.3 Volt Level (OK/FLT) +2.5V_xxx’cr’...
  • Page 175 SLM-7650 Satellite Modem Revision 4 Remote Control Specifications MN/SLM7650.IOM A.17 General Status, 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).
  • Page 176 SLM-7650 Satellite Modem Revision 4 Remote Control Specifications MN/SLM7650.IOM Frame Error Command: <add/FBER_'cr' Where: Status Response: >add/FBER_xn.nE-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 177 SLM-7650 Satellite Modem Revision 4 Remote Control Specifications MN/SLM7650.IOM Receive Command: <add/RSL_'cr' Where: Signal Level Response: >add/RSL_xsnn.ndBm'cr''lf'] Status x = < or > (data modifier to indicate that the receive signal level is less than or greater than the returned value).
  • Page 178 SLM-7650 Satellite Modem Revision 4 Remote Control Specifications MN/SLM7650.IOM A.18 Bulk Status Bulk Command: <add/BCAS_'cr' This command is similar to the 'BCS_' command, but returns Consol. Response: >add/BCAS_p1,p2,p3, . . . pn'cr''lf'] modem analog parameters. Additional status of new options Analog and features will always be appended to the end.
  • Page 179 SLM-7650 Satellite Modem Revision 4 Remote Control Specifications MN/SLM7650.IOM Where 'pn' is the last parameter returned. Parameter Parameter Name (Command Reference) Description Number Modulator RF output p1 = n, where 'n' is '0' (off) or '1' (on). (ref. 'RF_' command).
  • Page 180 SLM-7650 Satellite Modem Revision 4 Remote Control Specifications MN/SLM7650.IOM Bulk Consol. Status (continued) Parameter Parameter Name (Command Reference) Description Number Demodulator rate p17 = nnnn_mmmmm.mmm, code rate/data rate in kbit/s. (ref. 'DR_' command). Demodulator preset A assignment p18 = nnnn_mmmmm.mmm, code rate/data rate in kbit/s.
  • Page 181 SLM-7650 Satellite Modem Revision 4 Remote Control Specifications MN/SLM7650.IOM Bulk Consol. Status (continued) Parameter Parameter Name (Command Reference) Description Number Transmit clock phase p35 = n, where 'n' is '0' (NRM) or '1' (INV). (ref. 'TCP_' command). Receive clock phase p36 = n, where 'n' is '0' (NRM), '1' (INV).
  • Page 182 SLM-7650 Satellite Modem Revision 4 Remote Control Specifications MN/SLM7650.IOM Status (continued) Parameter Parameter Name Number (Command Reference) Description Transmit data fault p53 = n, where 'n' is '0' (NONE), '1' (DATA), or '2' (AIS). (ref. 'TDF_' command). Receive data fault p54 = n, where 'n' is '0' (NONE), '1' (DATA), or '2' (AIS).
  • Page 183 SLM-7650 Satellite Modem Revision 4 Remote Control Specifications MN/SLM7650.IOM Bulk Consol. Status (continued) Parameter Parameter Name (Command Reference) Description Number Demodulator Spectrum Rotation p71 = n, where 'n' is '0' (NRM), '1' (INV). (ref. 'DSR_' command). Reed-Solomon Encoder Enable p72 = n, where 'n' is '0' (off) or '1' (on).
  • Page 184 SLM-7650 Satellite Modem Revision 4 Remote Control Specifications MN/SLM7650.IOM Bulk Consol. Status (continued) Parameter Parameter Name (Command Reference) Description Number (Note 1) ASYNC TX Channel Parity p89 = xxxx, where ‘xxxx’ is the currently programmed parity. (ref. 'TOCP_' command). (Note 2) ASYNC RX Channel Parity p90 = xxxx, where ‘xxxx’...
  • Page 185 SLM-7650 Satellite Modem Revision 4 Remote Control Specifications MN/SLM7650.IOM Bulk Consol. Status (continued) Parameter Parameter Name (Command Reference) Description Number Receive IESS-310 Mode p107 = n, where 'n' is '0' (off) or '1' (on). (ref. 'R310_' command). Transmit BPSK Data Ordering p108 = n, where 'n' is '0' (NRM), '1' (INV).
  • Page 186 SLM-7650 Satellite Modem Revision 4 Remote Control Specifications MN/SLM7650.IOM Bulk Command: <add/BCSF_'cr' This command causes all modem fault status to be returned. Consoli- Response: >add/BCSF_abcdefghijklmnopq'cr''lf'] To reduce the length of the response, fault status is dated embedded into the bit structure of the characters that are Status returned.
  • Page 187 SLM-7650 Satellite Modem Revision 4 Remote Control Specifications MN/SLM7650.IOM Bit 4 = Selected Transmit Clock Activity. Bit 3 = SCT Synthesizer PLL Lock. Bit 2 = SCT Reference Clock Activity. Bit 1 = Transmit Clock PLL Fault. Bit 0 = drop fault.
  • Page 188 SLM-7650 Satellite Modem Revision 4 Remote Control Specifications MN/SLM7650.IOM 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 189 SLM-7650 Satellite Modem Revision 4 Remote Control Specifications MN/SLM7650.IOM A.19 System Information Equipment Command: <add/ET_'cr' Where: Type Response: >add/ET_tttttttt_xxx.yyy.zzz'cr''lf'] tttttttt = SLM7650 xxx.yyy.zzz = Software version. Boot M&C Command: <add/BFI_'cr' Where: Firmware Response: >add/BFI_'cr' xxx.yyy.zzz = Software version number (1.1.1 to Information VER_xxx.yyy.zzz'cr'...
  • Page 190 SLM-7650 Satellite Modem Revision 4 Remote Control Specifications MN/SLM7650.IOM State Of Command: <add/SOP_'cr' Product Response: >add/SOP_'cr' add'cr' Product Address abc'cr' Data Format rrrrr bps'cr' Baud Rate <var-string1>’cr’ Comm Type ……..……… <var-stringx>’cr’’lf’] Where: abc = Explained below. a = Number of data bits (7).
  • Page 191 SLM-7650 Satellite Modem Revision 4 Remote Control Specifications MN/SLM7650.IOM A.20 Stored Faults Information on stored faults is returned when requested. If no stored fault exists for a given fault number, the words “NO FAULT” will be returned instead of the normal time/data status.
  • Page 192 SLM-7650 Satellite Modem Revision 4 Remote Control Specifications MN/SLM7650.IOM Interface Command: <add/IRSF_#'cr' Receive Response: >add/IRSF_# hh:mm:ss MM/DD/YYYY'cr' Side Stored MOD_xxx’cr’ Module (OK/FLT) Faults PLL_xxx'cr' Buffer Clock PLL Lock (OK/FLT) CLK_xxx'cr' Selected Buffer Clock Activity (OK/FLT) RXD_xxx'cr' Receive Data Loss/AIS (OK/FLT)

  • Page 193: Metric Conversions

    METRIC CONVERSIONS Units of Length Unit Centimeter Inch Foot Yard Mile Meter Kilometer Millimeter 1 centimeter — 0.3937 0.03281 0.01094 6.214 x 10 0.01 — — 1 inch 2.540 — 0.08333 0.2778 1.578 x 10 0.254 — 25.4 1 foot 30.480 12.0 —...
  • Page 194 2114 85281 WEST TH STREET TEMPE ARIZONA 480 • 333 • 2200 PHONE 480 • 333 • 2161...

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