Comtech EF Data SLM-7650 Installation And Operation Manual

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Installation and O

765

Satellite Modem

eration Manual

Part Number MN/SLM7650.IOM

Revision 4

Comtech EF Data is an ISO 9001
Registered Company.

SLM-7650

Satellite Modem

Installation and Operation Manual

Part Number MN/SLM7650.IOM

Revision 4

September 10, 2005

Comtech EF Data, 2114 West 7th Street, Tempe, Arizona 85281 USA, [phone], FAX: [phone].

Copyright © Comtech EF Data, 2000, 2001, 2002, 2003. All rights reserved. Printed in the USA.

SLM-7650 Satellite Modem Revision 4
Preface MN/SLM7650.IOM

Customer Support

Contact the Comtech EF Data 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 EF Data
Attention: Customer Support Department
2114 West 7th Street
Tempe, Arizona 85281 USA
[phone] (Main Comtech EF Data Number)
[phone] (Customer Support Desk)
[phone] FAX

or, E-Mail can be sent to the Customer Support Department at:

service@comtechEF Data.com

Contact us via the web at www.comtechEF Data.com

1. To return a Comtech EF Data product (in-warranty and out-of-warranty) for
repair or replacement:

2. Request a Return Material Authorization (RMA) number from the Comtech EF
Data Customer Support Department.

3. Be prepared to supply the Customer Support representative with the model
number, serial number, and a description of the problem.

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
the end of this chapter.

.

ii

Table of Contents

CHAPTER 1. INTRODUCTION................................................................................ 1–1

1.1 Overview......................................................................................................................................................1–1

1.2 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

1.3 Operating Modes ........................................................................................................................................1–5

1.4 Options ........................................................................................................................................................1–5

1.5 System Specifications Summary................................................................................................................1–6

1.5.1

Bit Error Rate Performance with Noise ...................................................................................................1–8

1.5.2 Dimensional Envelope ...........................................................................................................................1–10

CHAPTER 2. INSTALLATION ................................................................................. 2–1

2.1 Unpacking ...................................................................................................................................................2–1

2.2 Installation ..................................................................................................................................................2–2

2.2.1 Installation Procedure...............................................................................................................................2–2

2.2.2 External Modem Connections..................................................................................................................2–2

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CHAPTER 3. OPERATION ....................................................................................... 3-1

3.1 Front Panel.................................................................................................................................................. 3-1

3.1.1 LED Indicators......................................................................................................................................... 3-2

3.1.2 Front Panel Keypad.................................................................................................................................. 3-2

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 .......................................................................................................... 3-6

3.3

3.4

Menus .......................................................................................................................................................... 3-8

3.4.1 Configuration Menu................................................................................................................................. 3-8

3.4.1.1 Modulator Menu .............................................................................................................................. 3-20

3.4.1.2 Demodulator Menu.......................................................................................................................... 3-21

3.4.1.3 Interface Menu................................................................................................................................. 3-25

3.4.1.4 Local AUPC Menu .......................................................................................................................... 3-26

3.4.1.5 Save Menu ....................................................................................................................................... 3-20

3.4.1.6 Recall Menu..................................................................................................................................... 3-21

3.4.2 Monitor Menu ........................................................................................................................................ 3-20

3.4.3 Faults/Alarms Menu............................................................................................................................... 3-21

3.4.3.1 Modulator Faults.............................................................................................................................. 3-22

3.4.3.2 Demodulator Faults.......................................................................................................................... 3-22

3.4.3.3 Transmit Interface Faults ................................................................................................................. 3-23

3.4.3.4 Receive Interface Faults................................................................................................................... 3-23

3.4.3.5 Common Equipment Faults ............................................................................................................. 3-24

3.4.3.6 IDR Backward Faults....................................................................................................................... 3-24

3.4.4 Stored Faults/Alarms Menu ................................................................................................................... 3-25

3.4.5 Remote AUPC Menu ............................................................................................................................. 3-26

3.4.5.1 Remote AUPC Configuration .......................................................................................................... 3-26

3.4.5.2 Remote AUPC Monitor ................................................................................................................... 3-26

3.4.6 Utility Menu........................................................................................................................................... 3-27

3.4.6.1 Utility Modulator Menu................................................................................................................... 3-28

3.4.6.2 Utility Demodulator Menu............................................................................................................... 3-29

3.4.6.3 Utility Interface Menu...................................................................................................................... 3-30

3.4.6.4 Utility System Menu ........................................................................................................................ 3-31

3.4.6.5 Utility Modem Type Menu .............................................................................................................. 3-33

3.5 Modes of Operation.................................................................................................................................. 3-34

3.5.1 7650-00 Operation ................................................................................................................................. 3-34

3.5.2 7650-02 Operation ................................................................................................................................. 3-35

3.5.3 IDR Operation........................................................................................................................................ 3-37

3.5.4 IBS Operation ........................................................................................................................................ 3-39

3.5.5 VSAT-IBS Operation............................................................................................................................. 3-41

3.5.6 IBS-309 Operation ................................................................................................................................. 3-43

3.5.7 ASYNC/AUPC Operation ..................................................................................................................... 3-45

3.5.8 EFD Operation ....................................................................................................................................... 3-47

3.5.9 Custom Operation .................................................................................................................................. 3-49

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CHAPTER 4. THEORY OF OPERATION ................................................................ 4–1

4.1 Overview......................................................................................................................................................4–1

4.2 Built in Test.................................................................................................................................................4–1

4.3 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.................................................................................................................................... 4-5

4.3.3.3 Trellis Coding .................................................................................................................................... 4-6

4.3.3.4 Turbo Products Codec (Hardware Option) ........................................................................................ 4-7

4.3.3.5 Uncoded Operation (No FEC) ........................................................................................................... 4-9

4.3.4 Modulation Types ..................................................................................................................................4–10

4.3.4.1 BPSK ............................................................................................................................................... 4-10

4.3.4.2 QPSK ............................................................................................................................................... 4-10

4.3.4.3 Offset QPSK .................................................................................................................................... 4-10

4.3.4.4 8-PSK............................................................................................................................................... 4-10

4.3.4.5 16-QAM........................................................................................................................................... 4-11

4.3.5 Bit Error Rate.........................................................................................................................................4–11

4.3.6 Symbol Rate...........................................................................................................................................4–11

4.3.7 Symbol Rate Calculations......................................................................................................................4–12

4.4 Theory of Operation.................................................................................................................................4–13

4.4.1 Modulator...............................................................................................................................................4–13

4.4.2 Demodulator...........................................................................................................................................4–14

4.4.3 Baseband Interface.................................................................................................................................4–17

4.4.3.1 Monitor and Control ........................................................................................................................ 4-17

4.4.3.2 Transmit and Receive Baseband ...................................................................................................... 4-17

4.4.3.3 Reference and Clock Distribution.................................................................................................... 4-24

CHAPTER 5. MAINTENANCE................................................................................. 5–1

5.1 Modem Firmware Upgrade .......................................................................................................................5–1

5.2 Fault Isolation .............................................................................................................................................5–4

5.2.1 Fan............................................................................................................................................................5–4

5.2.2 M & C Battery..........................................................................................................................................5–4

5.2.3 Faults/Alarms...........................................................................................................................................5–4

5.2.4 Fault/Alarm Display and Description.......................................................................................................5–8

5.2.5 Fault/Alarm Analysis ...............................................................................................................................5–9

5.2.5.1 Modulator Faults................................................................................................................................ 5-9

5.2.5.2 Demodulator Faults.......................................................................................................................... 5-10

5.2.5.3 Transmit Interface Faults ................................................................................................................. 5-10

5.2.5.4 Receive Interface Faults................................................................................................................... 5-12

5.2.5.5 Common Equipment Faults ............................................................................................................. 5-13

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5.3 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 ..................................................................................................................................... 5-16

5.3.2 Demodulator Tests .................................................................................................................................5–18

5.3.2.1 Dynamic Range................................................................................................................................ 5-18

5.3.2.2 Acquisition Range............................................................................................................................ 5-18

5.3.3 System BER Test ...................................................................................................................................5–18

5.3.4

Modem Test Modes................................................................................................................................5–19

5.3.4.1 IF Loopback..................................................................................................................................... 5-19

5.3.4.2 Base Band Loopback ....................................................................................................................... 5-20

5.3.4.3 Carrier Modes .................................................................................................................................. 5-21

5.3.4.4 Reed-Solomon Correction OFF ....................................................................................................... 5-22

5.3.4.5 2047 and MIL-188 Test Patterns...................................................................................................... 5-22

APPENDIX A. REMOTE CONTROL OPERATION..................................................B–1

GLOSSARY .................................................................................................................g-1

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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. Modem Provides Clock........................................................................................................................4–26

Figure 4-4. Modem Clocks Internally.....................................................................................................................4–27

Figure 4-5. Slave Modem-Loop Timed ..................................................................................................................4–28

Figure 4-6. EXT Master Clock as Source...............................................................................................................4–29

Figure 4-7. User Provides Data Only......................................................................................................................4–30

Figure 4-8. Internal SCT Clock Selection ..............................................................................................................4–31

Figure 4-9. Separate Links vs Asymmetrical Loop Timing....................................................................................4–32

Figure 5-1. Reflash Program Window......................................................................................................................5–2

Figure 5-2. Example of Upgrade File Location ........................................................................................................5–3

Figure 5-3. Example of Reflash Program File Location...........................................................................................5–3

Figure 5-4. Example of USB Drivers File Location .................................................................................................5–3

Figure 5-5. Modem Verification Test Setup...........................................................................................................5–14

Figure 5-6. DUAL Test Mode ................................................................................................................................5–15

Figure 5-7. OFFSET Test Mode.............................................................................................................................5–16

Figure 5-8. CENTER Test Mode............................................................................................................................5–17

Figure 5-9. IF Loopback.........................................................................................................................................5–19

Figure 5-10. Baseband Loopback...........................................................................................................................5–20

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Tables

Table 1-1 Operating Modes......................................................................................................................................1–5

Table 1-2 SLM-7650 Options...................................................................................................................................1–5

Table 1-3. System Specifications Summary..............................................................................................................1–6

Table 1-4. Viterbi Decoder BER ..............................................................................................................................1–8

Table 1-5. High Order Modulation Options .............................................................................................................1–9

Table 2-1. Modem Rear Panel Connectors...............................................................................................................2–2

Table 2-2. IF Interface...............................................................................................................................................2–3

Table 2-3. Modem External Reference Input ...........................................................................................................2–3

Table 2-4. Terrestrial Data Interface 37-Pin D Female ............................................................................................2–3

Table 2-5. Terrestrial Data Interface 25-Pin D Female (Optional)...........................................................................2–4

Table 2-6. Remote Control Interface (M&C) ...........................................................................................................2–4

Table-2-7. Asynchronous Data Interface..................................................................................................................2–5

Table 2-8. Fault/Alarm Status Interface ...................................................................................................................2–5

Table 2-9. 50 Pin Sub-D Female Interface Connector..............................................................................................2–6

Table 2-10. 15-Pin Sub-D Female (G.703 Balanced)...............................................................................................2–7

Table 2-11. 75Ω BNC Connectors (G.703 Unbalanced)..........................................................................................2–7

Table 3-1. Front Panel Indicators ............................................................................................................................. 3-2

Table 3-2. Keypad Functions.................................................................................................................................... 3-3

Table 3-3. Data Rate Ranges .................................................................................................................................... 3-6

Table 3-4. 7650-00 Default Parameters.................................................................................................................. 3-35

Table 3-5. 7650-02 Default Parameters.................................................................................................................. 3-36

Table 3-6. IDR Default Parameters ........................................................................................................................ 3-38

Table 3-7. IBS Default Parameters......................................................................................................................... 3-40

Table 3-8. VSAT-IBS Default Parameters ............................................................................................................. 3-42

Table 3-9. IBS-309 Default Parameters.................................................................................................................. 3-44

Table 3-10. ASYNC/AUPC Default Parameters.................................................................................................... 3-46

Table 3-11. EFD Default Parameters...................................................................................................................... 3-48

Table 4-1. Viterbi Decoding Summary.....................................................................................................................4–5

Table 4-2. Concatenated RS Coding Summary........................................................................................................4–6

Table 4-3. 8PSK/TCM Coding Summary.................................................................................................................4–7

Table 4-4. Available TPC Modes ..............................................................................................................................4–8

Table 4-5. Turbo Product Coding processing delay comparison...............................................................................4–8

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. Receive Interface Fault Information......................................................................................................5–12

Table 5-6. Common Equipment Fault Information ................................................................................................5–13

Table 5-7. Test Equipment Required......................................................................................................................5–14

Table 5-8. Conversion to S/N and Eb/N0 Chart .....................................................................................................5–23

Table 5-9. Reed-Solomon Overhead Correction Factor .........................................................................................5–23

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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.

Related Documents

Standards (Military)

MIL-STD-188-165

MIL-STD-810F

MIL-STD-1686C

Standards (Federal)

FED-STD-313

Standards (General)

EIA-422

EIA-485

EIA/TIA-530

IESS-308

IESS-309

IESS-310

ANSI/J-STD-001A

ANSI/VITA, 3-1995

ISO 9001

Interoperability and Performance Standards for SHF Communications PSK Modems (FDMA
Operation)

Environmental Test Method and Engineering Guidelines

Electrostatic Discharge Control Program for Protection of Electrical and Electronic Parts,
Assemblies and Equipment (Excluding Electrically Initiates Explosive Devices) Metric

Material Safety Data, Transportation Data and Disposal Data for Hazardous Materials
Furnished to Government Activities

Electrical Characteristics of Balanced Voltage Digital Interface Circuits

Standard for Electrical Characteristics of Generators and Receivers for use in Balanced
Digital Multi-point Systems

High Speed 24-Position Interface for Data Terminal Equipment and Data Circuit­Terminating Equipment

Performance Characteristics for Intermediate Data Rate (IDR) Digital Carriers

QPSK/FDMA Performance Characteristics for Intelsat Business Service (IBS)

Performance Characteristics for Intermediate Data Rate using 8PSK 2/3

(Standard A, B, C, E and F Earth Stations)

Joint Industry Standard Requirements for Soldered Electrical and Electronic Assemblies

American National Standard for Board Level Live Insertion for VME.

Quality System

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Comtech EF Data Specifications

SP/9710

SP/9710-1

Comtech EF Data Specification, SLM-7650 Satellite Modem

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

CAUTION

WARN ING

IMPORTANT

unsafe practices or risks of property damage.

WARNING indicates a potentially hazardous situation that, if not avoided,

could result in death or serious injury.

IMPORTANT indicates a statement that is associated with the task
being performed.

Metric Conversion

Metric conversion information is located on the inside back cover of this manual. This
information is provided to assist the operator in cross-referencing English to Metric
conversions.

Recommended Standard Designations

Recommended Standard (RS) Designations are equivalent to the Electronic Industries
Association (EIA). Either reference is satisfactory, except manuafacturer only will
reference one of the designators thru-out the manual.

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Trademarks

Product names mentioned in this manual may be trademarks or registered trademarks of
their respective companies and are hereby acknowledged.

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. 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> Type of power cord required for use in the European Community.

CAUTION: Double-pole/Neutral Fusing

!

ACHTUNG: Zweipolige bzw. Neutralleiter-Sicherung

International Symbols:

Alternating Current.

Fuse.
Safety Ground.

Chassis Ground.

NOTE: For additional symbols, refer to “Cautions and Warnings” listed earlier in this

preface.

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Warranty Policy

This Comtech EF Data 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
EF Data will, at its option, repair or replace products that prove to be defective.
For equipment under warranty, the customer is responsible for freight to Comtech EF
Data and all related custom, taxes, tariffs, insurance, etc. Comtech EF Data is responsible
for the freight charges only for return of the equipment from the factory to the customer.
Comtech EF Data will return the equipment by the same method (i.e., Air, Express,
Surface) as the equipment was sent to Comtech EF Data.

Limitations of Warranty

The foregoing warranty shall not apply to defects resulting from improper installation or
maintenance, abuse, unauthorized modification, or operation outside of environmental
specifications for the product, or, for damages that occur due to improper repackaging of
equipment for return to Comtech EF Data.

No other warranty is expressed or implied. Comtech EF Data specifically disclaims the
implied warranties of merchantability and fitness for particular purpose.

Exclusive Remedies

The remedies provided herein are the buyer's sole and exclusive remedies. Comtech EF
Data shall not be liable for any direct, indirect, special, incidental, or consequential
damages, whether based on contract, tort, or any other legal theory.

Disclaimer

Comtech EF Data has reviewed this manual thoroughly in order that it will be an easy-to­use guide to your equipment. All statements, technical information, and
recommendations in this manual and in any guides or related documents are believed
reliable, but the accuracy and completeness thereof are not guaranteed or warranted, and
they are not intended to be, nor should they be understood to be, representations or
warranties concerning the products described. Further, Comtech EF Data reserves the
right to make changes in the specifications of the products 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.

xii

Chapter 1. INTRODUCTION

This chapter provides an overview of the SLM-7650 satellite modem, referred to in this
manual as “the modem.”

1.1 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.

Figure 1-1. SLM-7650 Satellite Modem

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Introduction MN/SLM7650.IOM

1.2 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

• DSCS III

• NATO III

• Commercial

• INTELSAT

• EUTELSAT

• PANAMSAT

• NEW SKIES

• SES Americom

• Others

The modem is ideal for tri-band terminals requiring both commercial and government
access methods. Additionally, the modem can be used for virtually any closed network
satellite communication system. The modem is compliant with MIL-STD-188-165 over
the data rate range specified within this specification. The modem is also compliant to the
INTELSAT Earth Station Standards (IESS) -308, -309, and –310 specifications for the
following:

• Intermediate Data Rate (IDR)

• INTELSAT Business Services (IBS)

The modem is compatible with the following modems within the operating parameters
defined in this manual:

• OM-73(V)

• MD-1340

• MD-1352(P)/U (BEM-7650)

• SLM-8650

• SLM-3650

• SLM-6650

• SLM-4650

• LM-46/4046

• MD-945 (OM-73 interoperability mode only; orderwire not supported)

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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. Interface that receives digital signals, including data, clock, frequency reference, and
control from a digital signal source.

2. A function that scrambles the data.

3. A differential encoder.

4. Forward Error Correction (FEC) encoding.

5. Perform BPSK, QPSK, OQPSK, 8-PSK, and 16-QAM modulation.

6. An output IF signal.

7. Setup, control, monitoring, and upgrade of the modulator.

8. Built-in Test (BIT) function that detects fault conditions and allows faults to be
isolated to the modulator. This includes provision for an IF loopback and a transmit
interface test data pattern.

1.2.2 Definition of Demodulator Functions

The demodulator section accepts a signal from an Intermediate Frequency (IF) carrier,
demodulate the IF carrier, and after appropriate processing, outputs the data and clock to
the user. The demodulator provides the following functions:

1. An input for the IF signal.

2. Acquisition functions and a function to demodulate BPSK, QPSK, OQPSK, 8-PSK,
and 16-QAM carriers.

3. Forward Error Correction (FEC) decoding.

4. A differential decoder.

5. Descrambles the received data.

6. Digital interface to output digital signals, including data, and associated clock.

7. Setup, control, monitoring, and upgrade of the demodulator.

8. Built-in Test (BIT) function that detects fault conditions and allow faults to be
isolated to the demodulator. This includes provision for an IF loopback and a way to
measure the error using a test data pattern.

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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.

3. Provide Intelsat compatible Overhead Framing for Open Network interoperability.

4. Provide a buffer that can be clocked by the Tx, terrestrial source, an external
reference, internal clock, or from the recovered clock from the satellite link.

5. Monitor the modem status without interrupting service

6. Provide an interface for control of the modem parameters via the front panel or serial
remote control interface

1.2.4 Additional Features

The modem contains the following additional features:

• Fully Accessible System Topology (FAST)

• Built-in self test (BIST)

• Asymmetrical loop timing (ASLT)

• Selectable near or far end, baseband loopback with ASYNC overhead option enabled

• Intelsat compliant Reed-Solomon Codec

• ASYNChronous Channel Unit Overhead (ASYNC)

• Automatic Uplink Power Control (AUPC)

• Turbo Product Code (TPC) Forward Error Correction (FEC) (Hardware Option)

• G.703 Optional Interface with Overhead Card (AS/10175), 50-pin interface and

access to IESS ESC

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1.3 Operating Modes

Table 1-1 Operating Modes

Modes Description

7650-00 This is the basic OM-73 compatibility mode.
7650-02 This mode is compatible with the SLM8650-02 modem up to the 8.448

Mbps data rate limit of the SLM-8650.
Operation in this mode requires the optional ASYNC option to be

activated.

EFD 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.
Automatic Uplink Power Control (AUPC) is available to maintain the link

margin of a duplex link during the normal fades that occur with a satellite
communication network.

IDR, IBS, IBS-309,
and VSAT-IBS

Custom This mode of operation enables the programming of the modem for

These modes of operation are typical open network operating modes
used within the INTELSAT and EUTELSAT satellite networks.

emulating most proprietary modems.

1.4 Options

Table 1-2 SLM-7650 Options

Option Part No. Description Remarks

System Configuration

Modulation Type

Overhead Framing

Reed-Solomon
(IESS Fixed)
Turbo FEC PL/9652-1 Tx and Rx Option
G.703 Option

Overhead Interface

PL/9709-1 90 – 264 VAC TNC Standard Chassis Configuration
PL/9709-2 90 – 264 VAC BNC Option
SS/SLM7650-0009
SS/SLM7650-0010
SS/SLM7650-0010 Rx Only Option
SS/SLM7650-0009 Tx Only Option
PL/9685-1 37-pin EIA-449 Standard Baseband Interface
PL/9685-2 25-pin EIA-530 Option
BPSK, QPSK, OQPSK Standard
SS/SLM7650-0004 BPSK, QPSK, OQPSK, 8-PSK Option
SS/SLM7650-0004
SS/SLM7650-0005

9.6 kbps to 10 Mbps Standard Variable Data Rate
SS/SLM7650-0003 9.6 kbps to 20 Mbps Option
SS/SLM7650-0006 IDR/IBS Option
SS/SLM7650-0007 ASYNC/AUPC Option
SS/SLM7650-0006
SS/SLM7650-0007
SS/SLM7650-0008 Tx and Rx Option

PL/10175-1
PL/10175-2

Tx and Rx Standard

BPSK, QPSK, OQPSK,
8-PSK, 16-QAM

IDR/IBS/ASYNC/AUPC Option

G.703, 50 pin, access to IESS
ESC

Option

Option

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SLM-7650 Satellite Modem Revision 4
Introduction MN/SLM7650.IOM

1.5 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

BPSK: 1/1 and 1/2 (CEVD)
QPSK: 1/1, 1/2, 3/4, and 7/8 (CEVD)
OQPSK: 1/1, 1/2, 3/4, and 7/8 (CEVD)
8-PSK: 2/3 and 5/6 (TCM)

16-QAM: 3/4, 7/8 (CEVD)
Digital Data Rate 9.6 kbps to 20.0 Mbps, in 1 bps steps
Symbol Rate 9.6 ks/s to 10 Ms/s
External Reference In 1, 5, 10, or 20 MHz, selectable
Internal Reference Stability
Scrambling V.35 scrambler variations to meet MIL-STD-188-165 and IESS-308, -309,

IDR/IBS Framing Compatibility Support for IDR and IBS framing. Allows basic IDR/IBS open network

Built-in Test (BIT) Fault and status reporting, BER performance monitoring, IF loopback,

Summary Faults Reported via 15-pin D sub,

Modulation

Output Power +5 to –30 dBm, adjustable in 0.1 dB steps
Output Return Loss 17 dB
Output Impedance
Spurious 0 to 500 MHz (-5 to –30 dBm) –5 dBc

Tx Clock Source INT, Tx Terrestrial, and Data Source Sync
Output Connector TNC

Demodulation

Input Power:

Desired Carrier

Maximum Composite
Input Impedance
Input Connector TNC
Carrier Acquisition Range
Input Return Loss 17 dB minimum
Buffer Clock INT, EXTERNAL, Tx Terrestrial, Rx Satellite
Elastic Buffer 32 to 1,048,576 bits selectable

± 2 x 10

-310.

operation.

programmable test modes, Tx/Rx 2047 pattern provides and estimated BER.

FORM C relay contacts for Tx, Rx, Common equipment faults,
and Tx and Rx Alarms.

50Ω

0 to 500 MHz (+5 tp –20 dBm) –50 dBc > 64 kbps
o to 500 MHz (+5 to –20 dBm) _45 dBc < 64 kbps

-15 to –55 dBm
0 dBm or +40 dBc

50Ω

± 35 kHz, selectable

-7

Turbo Modulation Types
BPSK: 5/16 and 21/44
QPSK: 3/4, 7/8, 17/18, and 21/44
OQPSK: 3/4, 7/8, 17/18, and 21/44
8-PSK: 3/4, 7/8, and 17/18
16-QAM: 3/4 and 7/8

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Table 1-3. System Specifications Summary (continued)

Characteristic Specification
Coding Options

Uncoded 1/1
Viterbi K=7
Viterbi and Reed-Solomon Concatenated
Trellis Per IESS-310
Trellis and Reed-Solomon Concatenated
Turbo Tutbo product Code (TPC)

Open Network Option

IDR INTELSAT IESS-308 (framing only)
IDR INTELSAT IESS-310 (framing only)
IBS INTELSAT IESS-309 (framing only)

Environmental and Physical Speciufication

Prime Power 90 to 264 VAC, 47 to 63 Hz (DC optional)
Mounting 1 RU
Size 19W x 19D x 1.71H inches (1 RU)

(48W x 48D x 4.3H cm)
Weight < 15 lbs. (< 6.8 kg)
Temperature:

Operating
Storage (Non-operational)

Humidity 0 to 95%, non-condensing

0 to 50°C (32 to 122°F)

-40 to +70°C (-40 to 158°F)

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SLM-7650 Satellite Modem Revision 4
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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.

1.5.1.1 Vfiterbi Decoding BER Performance

Table 1-4. Viterbi Decoder BER

Eb/No Performance Viterbi Decoder, QPSK

Viterbi Reed-Solomon Turbo

BER 1/2 3/4 7/8 1/2 3/4 3/4 7/8

10-3 4.2 5.2 6.4

10-4 4.8 6.0 7.2

10-5 5.5 6.7 7.9

10-6 6.1 7.5 8.6 4.1 5.6 4.1 4.5

10-7 6.7 8.2 9.2 4.2 5.8 4.3 4.6

10-8 7.2 8.8 9.9 4.4 6.0 5.5 4.7

-10

10

5.0 6.3 5.5 4.8

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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

BER 2/3 5/6 3/4 7/8 3/4 7/8 3/4 7/8

10-6 6.2 8.2 8.4 9.8 6.5 7.1 7.6 8.2

10-7 6.5 8.5 8.6 10.0 6.9 7.2 7.95 8.35

10-8 6.7 8.9 8.8 10.3 7.2 7.3 8.3 8.5

10-9 6.9 9.3 9.0 10.5 7.5 7.4 8.65 8.65

-10

10

7.2 9.7 9.2 10.8 7.8 7.5 9.0 8.8

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SLM-7650 Satellite Modem Revision 4
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1.5.2 Dimensional Envelope

Note: Dimensions are given in both inches and millimeters.

1–10

Figure 1-2. Dimensional Envelope

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

2.1 Unpacking

The modem and manual are packaged in pre-formed, reusable, cardboard carton
containing foam spacing for maximum shipping protection.

Do not use any cutting tool that will extend more than 1 inch into the container and cause
damage to the modem.

CAUTION

To remove the modem:

1. Cut the tape at the top of the carton indicated by OPEN THIS END.

2. Remove the cardboard/foam space covering the modem.

3. Remove the modem, manual, and power cord from the carton.

4. Save the packing material for storage or reshipment purposes.

5. Inspect the equipment for any possible damage incurred during shipment.

6. Check the equipment against the packing list to ensure the shipment is correct.

7. Refer to Section 2.2 for installation instructions.

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2.2 Installation

2.2.1 Installation Procedure

Install the SLM-7650 into the equipment rack as follows:

1. Carefully lift the modem into the selected position in the equipment rack. Refer
Figure 1-2 for unit dimensional envelope.

2. Connect the cables to the proper locations on the rear panel.

Notes:

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

Op ti on al G. 70 3 C ar d

Figure 2-1. Rear Panel

2.2.2.1 Power Entry

Table 2-1. Modem Rear Panel Connectors

AC Option

Input Power 60W maximum, 50W typical
Input Voltage 90 to 132, or 175 to 264 VAC

Connector Type I.E.C.
Fuse Protection 2A slo-blo

Unit switches range automatically

Line and neutral fusing
5 mm type fuses

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SLM-7650 Satellite Modem Rev. 3
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2.2.2.2 IF Connection: Transmit and Receive

Table 2-2. IF Interface

Connector Name Connector Type

Tx IF CP1 TNC 50Ω (optional BNC 50 Ω)
Rx IF CP2 TNC 50Ω (optional BNC 50 Ω)

2.2.2.3 External Reference Input

Table 2-3 Modem External Reference Input

Connector Name Designation Connector Type

REF CP3

TNC 50Ω

(optional BNC 50 Ω)

2.2.2.4 Terrestrial Data Interfaces

Table 2-4. Terrestrial Data Interface

37-Pin D Female

Pin # Signal Name Pin # Signal Name

1 GND
2 N/C 20 GND
3 MOD_FLT 21 DEMOD_FLT
4 SDA 22 SDB
5 STA 23 STB
6 RDA 24 RDB
7 RTSA 25 RTSB
8 RTA 26 RTB
9 CTSA 27 CTSB
10 N/C 28 N/C
11 DMA 29 DMB
12 N/C 30 N/C
13 RRA 31 RRB
14 N/C 32 N/C
15 N/C 33 N/C
16 EXC/MCA 34 EXC/MCB
17 TTA 35 TTB
18 N/C 36 N/C
19 GND 37 GND

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SLM-7650 Satellite Modem Rev. 3
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Table 2-5. Terrestrial Data Interface

25-Pin D Female (Optional)

Pin # Signal Name Pin # Signal Name

1 GND
2 SDA 14 SDB
3 RDA 15 STA
4 RTSA 16 RDB
5 CTSA 17 RTA
6 DMA 18 N/C
7 GND 19 RTSB
8 RRA 20 EXC/MCA
9 RTB 21 DF
10 RRB 22 DMB
11 TTB 23 EXC/MCB
12 STB 24 TTA
13 CTSB 25 MF

2.2.2.5 Remote Control Interface (M&C)

Table 2-6. Remote Control Interface (M&C)

Remote Control Interface, 9 Pin D Female, DCE

EIA-485 4 Wire EIA-485 2 Wire EIA-232

Pin # Signal Name I/O Pin # Signal Name I/O Pin # Signal Name I/O

1 GND 1 GND 1 GND
2 2 2 RD O
3 3 3 TD I
4 +TX I 4 +TX/+RX I/O 4
5 -TX I 5 -TX/-RX I/O 5 GND
6 6 6 DSR O
7 7 7 RTS I
8 +RX O 8 +TX/+RX I/O 8 CTS O
9 -RX O 9 -TX/-RX I/O 9

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SLM-7650 Satellite Modem Rev. 3
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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 I/O Pin # Signal Name I/O Pin # Signal Name I/O

1 GND 1 GND 1 GND
2 2 2 RD O
3 3 3 TD I
4 +TX I 4 +TX/+RX I/O 4
5 -TX I 5 -TX/-RX I/O 5 GND
6 6 6 DSR O
7 7 7 RTS I
8 +RX O 8 +TX/+RX I/O 8 CTS O
9 -RX O 9 -TX/-RX I/O 9

2.2.2.7 Faults Status

Table 2-8. Fault/Alarm Status Interface

Specifications

Connector Type = 15-pin D subminiature, female
Form C Contact Ratings = 1A maximum at 24 VDC, 0.5A at 120 VAC

Pinout

Pin # Name Function Pin # Name Function

1 COM 10 COM
2 NO COMMON EQUIPMENT OK 11 NO TRANSMIT IS ALARMED
3 NC COMMON EQ IS FAULTED 12 NC TRANSMIT IS OK
4 COM 13 COM
5 NO RECEIVE IS OK 14 NO RECEIVE IS ALARMED
6 NC RECEIVE IS FAULTED 15 NC RECEIVE IS OK
7 COM
8 NO TRANSMIT IS OK
9 NC TRANSMIT IS FAULTED

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SLM-7650 Satellite Modem Rev. 3
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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 # IDR IBS ASYNC / Normal D&I

1, 2 GND GND GND GND
3 AGC (O) AGC (O) AGC (O) AGC (O)
33 DF (O) DF (O) DF (O) DF (O)
49 MF (O) MF (O) MF (O) MF (O)
34 SDA G.703 (I) SDA G.703 (I) SDA G.703 (I) DDI_A G.703 (I)
18 SDB G.703 (I) SDB G.703 (I) SDB G.703 (I) DDI_B G.703 (I)
36 RDA G.703 (O) RDA G.703 (O) RDA G.703 (O) IDO_A G.703 (O)
20 RDB G.703 (O) RDB G.703 (O) RDB G.703 (O) IDO_B G.703 (O)
37 TXDA EIA422 8k (I) SD-A EIA422 (I) SD-A EIA422 (I) DDO-A G.703 (O)
38 TXDB EIA422 8k (I) SD+B EIA422 (I) SD+B EIA422 (I) DDO-B G.703 (O)
12 BWAI_1 (I) TT-A EIA422 (I) TT-A EIA422 (I)
13 BWAI_2 (I) TT+B EIA422 (I) TT+B EIA422 (I)
21 TXC-A EIA422 8k (O) ST-A EIA422 (O) ST-A EIA422 (O)
22 TXC+B EIA422 8k (O) ST+B EIA422 (O) ST+B EIA422 (O)
45 Aud1-Ain / 64SDA (I) RTS-A EIA422 (I) RTS-A EIA422 (I)
29 Aud1-Bin / 64SDB (I) RTS+B EIA422 (I) RTS+B EIA422 (I)
47 Aud2-Ain / 64STA (O) CTS-A EIA422 (O) CTS-A EIA422 (O)
31 Aud2-Bin / 64STB (O) CTS+B EIA422 (O) CTS+B EIA422 (O)
39 RXDA EIA422 8k (O) RD-A EIA422 (O) RD-A EIA422 (O) IDI-A G.703 (I)
40 RXDB EIA422 8k (O) RD+B EIA422 (O) RD+B EIA422 (O) IDI-B G.703 (I)
23 RXC-A EIA422 8k (O) RT-A EIA422 (O) RT-A EIA422 (O)
24 RXC+B EIA422 8k (O) RT+B EIA422 (O) RT+B EIA422 (O)
46 Aud1-Aout / 64RTA (O) RR-A EIA422 (O) RR-A EIA422 (O)
30 Aud1-Bout / 64RTB (O) RR+B EIA422 (O) RR+B EIA422 (O)
48 Aud2-Aout / 64RDA (O) DSR-A EIA422 (O) DSR-A EIA422 (O) DSR_ESC EIA232 (O)
32 Aud2-Bout / 64RDB (O) DSR+B EIA422 (O) DSR+B EIA422 (O)
35 EXC-A EIA422 (I) EXC-A EIA422 (I) EXC-A EIA422 (I) EXC-A EIA422 (I)
19 EXC+B EIA422 (I) EXC+B EIA422 (I) EXC+B EIA422 (I) EXC+B EIA422 (I)
5 TXOctBin EIA422 (I) TXD_ESC EIA232 (I) TXDA_ESC EIA485/232 (I) TXD_ESC EIA232 (I)
4 TXOctAin EIA422 (I) TXDB_ESC EIA485 (I)
7 RXOctBout EIA422 (O) RXD_ESC EIA232 (O) RXDA_ESC EIA485/232 (O) RXD_ESC EIA232 (O)
6 RXOctAout EIA422 (O) RXDB_ESC EIA485 (O)
14 BWAI_3 (I) TXAOct EIA422 (I)
15 BWAI_4 (I) TXBOct EIA422 (I)
8 BWO1_C RXAOct EIA422 (O)
9 BWO2_C RXBOct EIA422 (O)
10 BWO3_C PROMPT_C PROMPT_C
11 BWO4_C SERVICE_C SERVICE_C
25 BWO1_NC TCLK_ESC EIA232 (O) CTS_ESC EIA232 (O) TCLK_ESC EIA232 (O)
26 BWO2_NC RCLK_ESC EIA232 (O) RCLK_ESC EIA232 (O)
27 BWO3_NC PROMPT_NC PROMPT_NC
28 BWO4_NC SERVICE_NC SERVICE_NC
41 BWO1_NO DSR_ESC EIA232 (O) DSR_ESC EIA232 (O) DSR_ESC EIA232 (O)
42 BWO2_NO
43 BWO3_NO PROMPT_NO PROMPT_NO
44 BWO4_NO SERVICE_NO SERVICE_NO
16 Demod_Fault_C
50 Demod_Fault_NO
17 Def_Maint_Alrm (O)

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