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SMS-758
User Manual
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Comtech EF Data SMS-758 User Manual

SMS-758
SMS-758
SMS-758SMS-758
Modem Protection Switch
Modem Protection Switch
Modem Protection SwitchModem Protection Switch Installation and Operation Manual
Installation and Operation Manual
Installation and Operation ManualInstallation and Operation Manual
Part Number MN/SMS758.IOM Revision 3
EFData Corporation is an ISO 9001 Registered Company
SMS-758
SMS-758
SMS-758SMS-758
Modem Protection Switch
Modem Protection Switch
Modem Protection SwitchModem Protection Switch Installation and Operation Manual
Installation and Operation Manual
Installation and Operation ManualInstallation and Operation Manual
Part Number MN/SMS758 Revision 3 May 19, 1995
EFData Top Assembly No. AS/1891
Special Instructions:
This is the fourth edition of the manual. Change bars were not utilized. This revision supersedes part number MN/U-SMS758 Edition 3 dated January, 1992.
Comtech EFData, 2114 West 7th Street, Tempe, Arizona 85281 USA, (480) 333-2200, FAX: (480) 333-2161.
Warranty Policy
This EFData Corporation product is warranted against defects in material and workmanship for a period of one year from the date of shipment . Duri ng the warranty period, EFData will, at its option, repair or replace produc t s that prove to be defective.
For equipment under warranty, the customer is responsible for freight to EFData and all related custom, taxes, tariffs, insurance, etc. EFDat a i s responsible for the freight charges return the equipment by the same method (i.e., A i r, Express, Surface) as the equipment was sent to EFDat a.
for return of the equipment f rom the factory to the customer. EFDat a will
only
Limitations of Warranty
The foregoing warranty shall not apply to defects resulting from i mproper installation or maintenance, abuse, unaut horized modification, or operation outside of environmental specifi cations for the product, or, for damages that occur due to improper repackaging of equipment for return to EFData.
No other warranty is expressed or implied. EFData Corporation 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. E FData Corporation shall not be liable for any direct, indirect, special, incidental, or consequential damages, whether bas ed on contact, tort, or any other legal theory.
Disclaimer
EFData has reviewed this manual thoroughly in order that it will be an easy-to-use guide to your equipment. All statements, technical informat i on, and recommendations in this manual and in any guides or rel ated documents are believed reli abl e, but the accuracy and completeness thereof are not guaranteed or warranted, and they are not intended to be, nor should they be unders t ood to be, representations or warranties concerning the products described. Further, EFData 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 not i fy any person of such changes.
If you have any questions regarding your equipment or the information i n this manual, please contact the EFData Customer Service Depart ment. (For more information, refer to the preface.)

About this Manual

This manual describes the installation and operation for the EFData SMS-758 modem protection switch.

Audience

This is a technical document intended for earth station engineers, technicians, and operators responsible for the operation and maintenance of the SMS-758 modem protection switch.

Organization

This manual includes the following chapters and appendixes:

Preface

Chapter 1 — describes the unit’s purpose, function, and specifications.
•
Chapter 2 — describes the installation process.
•
• Chapter 3 — describes the operation.
Chapter 4 — describes the theory of operation.
•
• Chapter 5 — describes maintenance and troubleshooting.
• Appendix A — describes remote control operation for modem switching.
• Appendix B — describes remote control operation for independent mod/demod
switching.
Appendix C — describes the 7 downlink/1 backup option.
•
MN/SMS758 Rev. 3 i
Preface SMS-758 Modem Protection Switch

Revision Numbering Scheme

The following table identifies the revision numbering scheme utilized for EFData installation and operation manuals, addenda, and supplements:
Part Number Description
MN/SMS758 Rev. 0 1st edition of the manual. MN/SMS758 Rev. 1 1st revision of the manual. MN/SMS758 Rev. 2 2nd revision of the manual. MN/SMS758 Rev. 1
MN/SMS758 Rev. 2 MN/SMS758 Rev. 2 MN/SMS758 Rev. 3 3rd revision of the manual (it includes information from
SA
A B
Supplement A to Rev. 1 of the manual. (The “S” in “SA” designates “Supplement.”) Addendum A to Rev. 2 of the manual. Addendum B to Rev. 2 of the manual.
Addenda A and B).

Conventions Used in this Manual

Screen Output and Command Syntax

A distinctive type of font is used for screen output and command syntax, which looks like this:
This line is in monospace font.

Notes

Note: This is the style for a note.

Cautions, Warnings, and Dangers

The international hazard alert signal is shown below. The signal word listed beneath the symbol is changed to indicate the nature of the hazard. The terms, in increasing order of seriousness, are CAUTION, WARNING, and DANGER.
CAUTION indicates a hazardous situation that, if not avoided, may result in
!
CAUTION
WARNING
minor or moderate injury. CAUTION may also be used to indicate other unsafe practices or risks of property damage.
WARNING indicates a potentially hazardous situation that, if not avoided,
!
could result in death or serious injury.
DANGER indicates an imminent hazard that, if not avoided, will result in
!
DANGER
ii MN/SMS758 Rev. 3
death or serious injury.
SMS-758 Modem Protection Switch Preface

Heading Hierarchy

Each section of this manual is structured according to the following heading hierarchy:
Level Heading Format
1 (Highest) 2
3 4 (Lowest)
Level Heading 1 Level Heading 2

Case Sensitivity

Unless stated otherwise, commands and arguments listed in this manual are not case sensitive.

References Used in this Manual

Military Standards

References to “MIL-STD-118” apply to the 114A series (i.e., MIL-STD-118-114A), which provides electrical and functional characteristics of the unbalanced and balanced voltage digital interface circuits applicable to both long haul and tactical communications. Specifically, these references apply to the MIL-STD-188-114A electrical characteristics for a balanced voltage digital interface circuit, Type 1 generator, for the full range of data rates.
Level Heading 3 Level Heading 4
For more information, refer to the following document:
• Department of Defense (DOD) MIL-STD-188-114A, “Electrical Characteristics
of Digital Interface Circuits.”

Trademarks

Product names mentioned in this manual may be trademarks or registered trademarks of their respective companies and are hereby acknowledged.
MN/SMS758 Rev. 3 iii
Preface SMS-758 Modem Protection Switch

Related Documents

The following documents are referenced in this manual:
• Department of Defense (DOD) MIL-STD-188-114A, “Electrical Characteristics
of Digital Interface Circuits.”
• EFData Specification SP/1891.

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 complete the Technical Publications Remarks Form found at the end of this manual.

Returning a Product

To return an EFData (in-warranty and out-of-warranty) product for repair or replacement:
1. Request a Return Material Authorization (RMA) number from the EFData Customer Service Department.
Be prepared to supply the Customer Service representative with the model number, serial number, and a description of the problem.
2. To ensure that the product is not damaged during shipping, pack the product in its original shipping carton/packaging.
3. Ship the product back to EFData. (Shipping charges should be prepaid.)
For more information regarding the warranty policies, refer to the disclaimer page located behind the title page.

Upgrading a Product

To receive product upgrade information (i.e., hardware and/or software), contact an EFData Customer Service representative.

Product Training

To obtain product training information, contact an EFData Customer Service Representative.
iv MN/SMS758 Rev. 3

Table of Contents

CHAPTER 1. INTRODUCTION..................................................................................1–1
1.1 Scope............................................................................................................................................................. 1–1
1.2 Purpose and Function.................................................................................................................................. 1–1
1.3 Description ................................................................................................................................................... 1–2
1.4 Performance Specification........................................................................................................................ 1–10
CHAPTER 2. INSTALLATION...................................................................................2–1
2.1 Unpacking..................................................................................................................................................... 2–1
2.2 System Installation.......................................................................................................................................2–2
2.2.1 Switch Setup........................................................................................................................................... 2–2
2.2.2 Modem Setup......................................................................................................................................... 2–3
2.3 System Requirements.................................................................................................................................. 2–3
2.4 External Connections.................................................................................................................................. 2–4
2.4.1 Data I/O.................................................................................................................................................. 2–5
2.4.2 External RS485 and RS232 Interface (J1 and J2) .................................................................................. 2–6
2.4.3 Modem Control RS485.......................................................................................................................... 2–6
2.4.4 On-Line Status (J4, J5)........................................................................................................................... 2–7
2.4.5 Relay-Remote/Fault (J6)......................................................................................................................... 2–8
2.4.6 Downlink Inputs (J7 through J10, J12 through J15)............................................................................... 2–8
2.4.7 Back-up Demods (J11, J16)................................................................................................................... 2–9
2.4.8 Prime Mod Inputs (J18 through J25)...................................................................................................... 2–9
2.4.9 Back-up Mod Inputs (J26, J36).............................................................................................................. 2–9
2.4.10 Offline IF Outputs (J17, J27) ............................................................................................................... 2–9
2.4.11 IF Outputs (J28 through J35).............................................................................................................. 2–10
2.4.12 AC Power (J37, J38).......................................................................................................................... 2–10
2.4.13 DC Power (J37, J38).......................................................................................................................... 2–10
2.4.14 Ground (J37) ...................................................................................................................................... 2–10
MN/SMS758 Rev. 3 v
Table of Contents SMS-758 Modem Protection Switch
CHAPTER 3. OPERATION........................................................................................3–1
3.1 Front Panel Description.............................................................................................................................. 3–1
3.1.1 LED Indicators....................................................................................................................................... 3–2
3.1.2 Keypad and LCD Display....................................................................................................................... 3–2
3.2 Switch Setup................................................................................................................................................. 3–6
3.2.1 System Setup.......................................................................................................................................... 3–6
3.2.1.1 Time and Date Menu.......................................................................................................................3–6
3.2.1.2 Downlink Option.............................................................................................................................3–7
3.2.1.3 Active Prime Modulators Menu...................................................................................................... 3–7
3.2.1.4 Active Prime Demodulators Menu.................................................................................................. 3–7
3.2.1.5 Active Backup Modulators Menu................................................................................................... 3–7
3.2.1.6 Active Backup Demodulators Menu............................................................................................... 3–7
3.2.1.7 Modem Addresses Menu................................................................................................................. 3–8
3.2.2 Modem Setup......................................................................................................................................... 3–8
3.2.2.1 Interface Type Menu....................................................................................................................... 3–9
3.2.2.2 Downlink Selection Menu............................................................................................................. 3–10
3.2.2.3 Modulator Priority Menu.............................................................................................................. 3–10
3.2.2.4 Demodulator Priority Menu.......................................................................................................... 3–10
3.2.2.5 Demodulator Delay ....................................................................................................................... 3–11
3.2.2.6 Modulator Delay........................................................................................................................... 3–11
3.2.3 Modem Configuration.......................................................................................................................... 3–12
3.2.3.1 Prime and Backup Modem Configuration..................................................................................... 3–12
3.2.3.2 Modem Configuration Menu......................................................................................................... 3–12
3.2.3.3 Modem Verification...................................................................................................................... 3–13
3.2.4 Faults.................................................................................................................................................... 3–13
3.2.4.1 Modulator Operation Fault............................................................................................................ 3–13
3.2.4.2 Demodulator Operation Fault....................................................................................................... 3–14
3.2.4.3 M:N Faults.................................................................................................................................... 3–14
3.2.4.4 Battery Faults................................................................................................................................ 3–14
3.2.5 Operational Modes............................................................................................................................... 3–15
3.2.5.1 Bypass Mode................................................................................................................................. 3–15
3.2.5.2 Auto Mode.................................................................................................................................... 3–15
3.2.5.3 Local Mode................................................................................................................................... 3–20
3.2.5.4 Remote Mode................................................................................................................................ 3–20
3.2.6 Status Menu.......................................................................................................................................... 3–21
CHAPTER 4. THEORY OF OPERATION..................................................................4–1
4.1 Monitor and Control................................................................................................................................... 4–1
4.1.1 Theory of Operation............................................................................................................................... 4–2
4.1.2 M&C Serial Interface............................................................................................................................. 4–2
4.1.3 Remote Baud Rate.................................................................................................................................. 4–3
4.1.4 Remote Address..................................................................................................................................... 4–3
4.1.5 External Remote Serial Interface Selection............................................................................................ 4–4
4.1.6 Battery.................................................................................................................................................... 4–4
4.1.7 Error Response Function........................................................................................................................ 4–4
4.1.8 External I/O Interrupt Arbitration...........................................................................................................4–5
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SMS-758 Modem Protection Switch Table of Contents
4.2 Modem Control Interface Specification..................................................................................................... 4–5
4.3 Relay-Remote Interface Specification........................................................................................................ 4–6
4.3.1 Command Structure................................................................................................................................ 4–6
4.4 Fault Interface Specification....................................................................................................................... 4–9
4.4.1 Controller fault....................................................................................................................................... 4–9
4.4.2 M:N Fault............................................................................................................................................... 4–9
4.4.3 Demodulator Signal Fault..................................................................................................................... 4–10
4.5 Online Status Specification....................................................................................................................... 4–10
4.5.1 Modulator Online Status....................................................................................................................... 4–10
4.5.2 Demodulator Online Status.................................................................................................................. 4–10
4.6 Interface Switches...................................................................................................................................... 4–11
4.6.1 RS-422/449 and MIL-STD-188-114/RS-449 Interface Switch............................................................ 4–11
4.6.1.1 Specification ................................................................................................................................. 4–11
4.6.1.2 Connector Pinouts......................................................................................................................... 4–12
4.6.2 V.35 Interface Switch........................................................................................................................... 4–15
4.6.2.1 Specification ................................................................................................................................. 4–15
4.6.2.2 Connector Pinouts......................................................................................................................... 4–16
4.6.3 V.35/RS-232 Interface Switch.............................................................................................................. 4–19
4.6.3.1 Electrical Specifications................................................................................................................ 4–20
4.6.3.2 Connector Pinouts......................................................................................................................... 4–21
4.6.3.2.1 V.35 Option........................................................................................................................... 4–21
4.6.3.2.2 RS-232 Option....................................................................................................................... 4–22
4.6.4 DS-1 and G.703 Interface Switch......................................................................................................... 4–25
4.6.4.1 Specification ................................................................................................................................. 4–26
4.6.4.2 Connector Pinouts......................................................................................................................... 4–26
4.6.5 IDR Interface Switch............................................................................................................................ 4–29
4.6.5.1 Specification ................................................................................................................................. 4–30
4.6.5.2 Connector Pinouts......................................................................................................................... 4–30
4.6.6 2:N IDR Interface Switch (1877 and 1879).......................................................................................... 4–33
4.6.6.1 Specification ................................................................................................................................. 4–33
4.6.6.2 Operation ...................................................................................................................................... 4–34
4.6.6.3 Connector Pinouts......................................................................................................................... 4–34
4.6.7 2:N IBS/ASYNC Interface Switch (1694 and 1695)............................................................................ 4–38
4.6.7.1 Specification ................................................................................................................................. 4–38
4.6.7.2 Operation ...................................................................................................................................... 4–39
4.6.7.3 Connector Pinouts......................................................................................................................... 4–39
4.7 Address Decoder/Driver............................................................................................................................ 4–44
4.7.1 Specifications....................................................................................................................................... 4–44
4.7.2 Theory of Operation............................................................................................................................. 4–44
4.8 IF Switch Driver ........................................................................................................................................ 4–46
4.8.1 Specifications....................................................................................................................................... 4–46
4.8.2 Theory of Operation............................................................................................................................. 4–46
MN/SMS758 Rev. 3 vii
Table of Contents SMS-758 Modem Protection Switch
4.9 IF Switch..................................................................................................................................................... 4–47
4.9.1 Specifications....................................................................................................................................... 4–47
4.9.2 Theory of Operation............................................................................................................................. 4–47
4.10 Online Telemetry..................................................................................................................................... 4–49
4.10.1 Specifications..................................................................................................................................... 4–49
4.10.2 Theory of Operation........................................................................................................................... 4–49
4.11 Power Supply ........................................................................................................................................... 4–51
4.11.1 Specifications..................................................................................................................................... 4–51
CHAPTER 5. MAINTENANCE...................................................................................5–1
5.1 Fault Descriptions........................................................................................................................................ 5–1
5.1.1 Modulator Operation Fault..................................................................................................................... 5–1
5.1.2 Demodulator Operation Fault................................................................................................................. 5–1
5.1.3 M:N Faults.............................................................................................................................................. 5–2
5.1.4 Battery Faults......................................................................................................................................... 5–2
5.2 Fault Isolation.............................................................................................................................................. 5–3
5.2.1 Modulator Operation.............................................................................................................................. 5–3
5.2.2 Demodulator Operation.......................................................................................................................... 5–4
5.2.3 M:N Operation ....................................................................................................................................... 5–5
5.2.4 Battery.................................................................................................................................................... 5–6
5.3 Module Replacement................................................................................................................................... 5–7
5.3.1 Power Supply......................................................................................................................................... 5–7
5.3.2 IF Switch................................................................................................................................................ 5–8
5.3.3 Switch Driver ......................................................................................................................................... 5–8
5.3.4 Address Decoder/Driver......................................................................................................................... 5–8
5.3.5 M&C ...................................................................................................................................................... 5–8
5.3.6 Online Telemetry.................................................................................................................................... 5–9
5.3.7 Interface Switches.................................................................................................................................. 5–9
5.4 Repacking for Shipment.............................................................................................................................. 5–9
5.4.1 Return Instructions................................................................................................................................. 5–9
5.4.2 Repacking Instructions........................................................................................................................... 5–9
APPENDIX A. REMOTE CONTROL OPERATION: MODEM SWITCH.................... A–1
A.1 General ........................................................................................................................................................A–1
A.2 Message Structure ......................................................................................................................................A–1
A.2.1 Start Character.......................................................................................................................................A–2
A.2.2 Device Address......................................................................................................................................A–2
A.2.3 Command/Responses.............................................................................................................................A–3
A.2.4 End Character........................................................................................................................................A–3
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SMS-758 Modem Protection Switch Table of Contents
A.3 Configuration Commands/Responses .......................................................................................................A–4
A.3.1 Modulator Configuration Commands/Responses..................................................................................A–4
A.3.1.1 Prime Modulator Active.................................................................................................................A–4
A.3.1.2 BackupModulator Active...............................................................................................................A–4
A.3.2 Demodulator Configuration Commands/Responses..............................................................................A–4
A.3.2.1 Prime Demodulator Active.............................................................................................................A–4
A.3.2.2 Prime Demodulator Transponder...................................................................................................A–5
A.3.2.3 Backup Demodulator Active..........................................................................................................A–5
A.3.3 Modem Configuration Commands/Responses.......................................................................................A–5
A.3.3.1 Prime Modem Address...................................................................................................................A–5
A.3.3.2 Backup Modem Address................................................................................................................A–6
A.3.3.3 Prime Modem Interface Type.........................................................................................................A–6
A.3.3.4 Backup Modem Interface Type......................................................................................................A–6
A.3.3.5 Modem Priority..............................................................................................................................A–7
A.3.3.6 Modem Online Delay.....................................................................................................................A–7
A.3.4 Status Commands/Responses.................................................................................................................A–7
A.3.4.1 Configuration Status....................................................................................................................... A–7
A.3.4.1.1 Prime Modulator Configuration Status...................................................................................A–7
A.3.4.1.2 Backup Modulator Configuration Status ................................................................................A–8
A.3.4.1.3 Prime Demodulator Configuration Status...............................................................................A–8
A.3.4.1.4 Backup Demodulator Configuration Status............................................................................A–8
A.3.4.2 Modulator Status............................................................................................................................A–9
A.3.4.3 Demodulator Status........................................................................................................................A–9
A.3.4.4 Prime Modem Fault Status.............................................................................................................A–9
A.3.4.5 Backup Modem Fault Status ........................................................................................................A–10
A.3.4.6 Firmware Version Status.............................................................................................................. A–10
A.3.4.7 Equipment Type...........................................................................................................................A–10
A.3.5 Operational Commands.......................................................................................................................A–10
A.3.5.1 Time of Day.................................................................................................................................A–10
A.3.5.2 Date..............................................................................................................................................A–11
A.3.5.3 Mode Command...........................................................................................................................A–11
A.3.5.4 Set Backup Modem Online/Offline..............................................................................................A–11
A.3.5.5 Load Modem Configuration(s).....................................................................................................A–12
A.3.5.5.1 Load All Active Modems Configurations.............................................................................A–12
A.3.5.5.2 Load Prime Modem Configuration....................................................................................... A–12
A.3.5.5.3 Load Backup Modem Configuration ....................................................................................A–13
A.3.5.6 Verify Modem Configuration(s)...................................................................................................A–13
A.3.5.6.1 Verify All Active Modems Configurations...........................................................................A–13
A.3.5.6.2 Verify Prime Modem Configuration .....................................................................................A–14
A.3.5.6.3 Verify Backup Modem Configuration..................................................................................A–14
A.3.5.7 Operational Status Commands (Faults)........................................................................................A–14
A.3.5.7.1 Modulator Operational Faults Status....................................................................................A–14
A.3.5.7.2 Demodulator Operational Faults Status................................................................................A–14
A.3.5.7.3 M:N Switch Fault Status Summary.......................................................................................A–15
A.3.5.7.4 Missing Parameter Faults...................................................................................................... A–15
A.3.5.7.5 Bulk Consolidated Status Faults...........................................................................................A–16
A.3.5.8 Downlink Transponder Option.....................................................................................................A–21
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Table of Contents SMS-758 Modem Protection Switch
APPENDIX B. REMOTE CONTROL OPERATION: INDEPENDENT MOD/DEMODB–1
B.1 General.........................................................................................................................................................B–1
B.2 Message Structure.......................................................................................................................................B–1
B.2.1 Start Character.......................................................................................................................................B–2
B.2.2 Device Address......................................................................................................................................B–2
B.2.3 Command/Responses .............................................................................................................................B–3
B.2.4 End Character........................................................................................................................................B–3
B.3 Configuration Commands/Responses........................................................................................................B–4
B.3.1 Modulator Configuration Commands/Responses ..................................................................................B–4
B.3.1.1 Prime Modulator Active.................................................................................................................B–4
B.3.1.2 Prime Modulator Priority............................................................................................................... B–4
B.3.1.3 Prime Modulator Online Delay.......................................................................................... ............B–4
B.3.1.4 Backup Modulator Active..............................................................................................................B–5
B.3.2 Demodulator Configuration Commands/Responses ..............................................................................B–5
B.3.2.1 Prime Demodulator Active.............................................................................................................B–5
B.3.2.2 Prime Demodulator Priority...........................................................................................................B–5
B.3.2.3 Prime Demodulator Transponder...................................................................................................B–6
B.3.2.4 Prime Demodulator Online Delay..................................................................................................B–6
B.3.2.5 Backup Demodulator Active..........................................................................................................B–6
B.3.3 Modem Configuration Commands/Responses.......................................................................................B–7
B.3.3.1 Prime Modem Address...................................................................................................................B–7
B.3.3.2 Backup Modem Address................................................................................................................B–7
B.3.3.3 Prime Modem Interface Type.........................................................................................................B–7
B.3.3.4 Backup Modem Interface Type......................................................................................................B–8
B.3.4 Status Commands/Responses.................................................................................................................B–8
B.3.4.1 Configuration Status.......................................................................................................................B–8
B.3.4.1.1 Prime Modulator Configuration Status ...................................................................................B–8
B.3.4.1.2 Backup Modulator Configuration Status................................................................................. B–8
B.3.4.1.3 Prime Demodulator Configuration Status...............................................................................B–9
B.3.4.1.4 Backup Demodulator Configuration Status.............................................................................B–9
B.3.4.2 Modulator Status............................................................................................................................B–9
B.3.4.3 Demodulator Status......................................................................................................................B–10
B.3.4.4 Prime Modem Fault Status...........................................................................................................B–10
B.3.4.5 Backup Modem Fault Status........................................................................................................B–10
B.3.4.6 Firmware Version Status..............................................................................................................B–10
B.3.4.7 Equipment Type...........................................................................................................................B–11
B.3.5 Operational Commands .......................................................................................................................B–11
B.3.5.1 Time of Day.................................................................................................................................B–11
B.3.5.2 Date..............................................................................................................................................B–11
B.3.5.3 Mode Command...........................................................................................................................B–12
B.3.5.4 Set Backup Modulator Online/Offline.......................................................................................... B–12
B.3.5.5 Set Backup Demodulator Online/Offline .....................................................................................B–12
B.3.5.6 Load Modem Configuration(s)..................................................................................................... B–13
B.3.5.6.1 Load All Active Modems Configurations.............................................................................B–13
B.3.5.6.2 Load Prime Modem Configuration.......................................................................................B –13
B.3.5.6.3 Load Backup Modem Configuration.....................................................................................B–14
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B.3.5.7 Verify Modem Configuration(s)...................................................................................................B–14
B.3.5.7.1 Verify All Active Modems Configurations...........................................................................B–14
B.3.5.7.2 Verify Prime Modem Configuration.....................................................................................B–15
B.3.5.7.3 Verify Backup Modem Configuration ..................................................................................B–15
B.3.5.8 Operational Status Commands (Faults)........................................................................................B–15
B.3.5.8.1 Modulator Operational Faults Status ....................................................................................B–15
B.3.5.8.2 Demodulator Operational Faults Status................................................................................B–15
B.3.5.8.3 M:N Switch Fault Status Summary....................................................................................... B–16
B.3.5.8.4 Missing Parameter Faults......................................................................................................B–16
B.3.5.8.5 Bulk Consolidated Status Faults...........................................................................................B–17
B.3.5.9 Downlink Transponder Option.....................................................................................................B–22
APPENDIX C. 7 DOWNLINK OPTION..................................................................... C–1
C.1 External Connections .................................................................................................................................C–2
C.1.1 D/L Switch Input (J7) ............................................................................................................................C–2
C.1.2 D/L Switch Output (J16)........................................................................................................................C–2
C.1.3 Downlink Inputs (J8 through J10, J12 through J15) ..............................................................................C–3
C.1.4 Backup Demod (J11).............................................................................................................................C–3
C.2 Front Panel Operation ...............................................................................................................................C–3
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xii MN/SMS758 Rev. 3

1.1 Scope

This manual describes the SMS-758 modem protection switch (Figure 1-1), hereafter called “the switch.”
The switch is a rack-mounted unit that provides independent backup control for modulators and demodulators, or simultaneous modulator and demodulator (modem) switching.
If a primary modem element failure occurs, the switch limits the loss of communication.

1.2 Purpose and Function

Chapter 1.
INTRODUCTION
The switch is a fully automated, self-contained switching unit for many EFData satellite data modems, including:
• SDM-650B
• SDM-308B
• SDM-309B
• SDM-8000
• SDM-100
• SLM-4650
• SLM-8650
The switch, with one or two backup modems, provides redundancy for up to eight primary modems.
The switch will automatically or manually switch one of two backup modulators online to take the place of any of eight primary modulators. Also, one of two backup demodulators may be switched online to receive any one of four possible downlinks.
MN/SMS758 Rev. 3 1–1
Introduction SMS-758 Modem Protection Switch
The switch does not contain an IF signal combining/dividing section, so that the user may externally tailor each application for minimum loss. An example system configuration using four prime modems is shown in Figure 1-6.
In normal operation, each prime modulator input is fed through to its corresponding IF output, and the backup modulators are fed to the offline IF outputs. When a modulator fault is detected, the faulted modulator is switched offline and re-routed to one of the offline IF outputs. The next available backup modulator is configured identically to the failed modulator, and is switched ON in its place.
Figure 1-2 shows the switch interface between the prime and backup modems, the terminal equipment, and IF converter equipment. The switch provides:
• All data and IF switching circuitry
• Complete status and fault reporting
The switch provides a high degree of flexibility by utilizing the multiple data rate feature of the modems, and dual backups. Automatic configuration greatly reduces setup time.

1.3 Description

The switch is complete and self contained, in a standard 19” rack-mountable enclosure weighing approximately 50 lbs. It is of modular construction. The chassis assembly is segmented with upper and lower chassis mounted backplanes.
The top section (Figure 1-3) contains:
The lower section contains:
The switch contains a microcontroller system. This system controls all switching functions and maintains communication with the modems. It also communicates with an optional external controller. A remote operator can control the switching by using a terminal or computer, and the remote serial interface.
• Two power supplies providing redundancy in case of power failure, four printed
circuit board (PCB) assemblies, and the front panel keypad and display, which are accessible from the front of the switch.
• Serial remote interfaces, relay-remote/fault, modulator and demodulator status,
and IF connections accessible from the rear panel. Figure 1-4 is a block diagram of the IF switching matrix.
• An enclosed storage area, accessible from the front panel.
• The data switch interface modules, accessible from the rear.
1–2 MN/SMS758 Rev. 3
SMS-758 Modem Protection Switch Introduction
Redundant power supplies maintain switch operation even if one power supply fails. The switch and modem configurations are stored in battery-backed memory devices, for protection against power loss.
A block diagram of the switch is shown in Figure 1-5.
SMS-758 MO DEM PRO TECTION SWITCH SW1.00 PRESS NE XT
SMS-758
M:N SW ITC H
POWER AUTO LOCAL REMOTE BYPASS
BATTERY
DEMOD
FAULTSSTATUS
MOD
M:N
Figure 1-1. SMS-758 Modem Protection Switch
F1 8
7
F2
45
NXT
1
PRV
0
9 6
2
3
ENT
.
MN/SMS758 Rev. 3 1–3
Introduction SMS-758 Modem Protection Switch
Figure 1-2. System Block Diagram
1–4 MN/SMS758 Rev. 3
SMS-758 Modem Protection Switch Introduction
SLOT 1
POWER SUPPLY
NOT USED
SLOT 3
SWITCH DRIVER
SLOT 2
SLOT 4
ADDRESS DEC/DRV
SLOT 5
MONITOR AND CONTROL
SLOT 6
ONLINE TELEMETRY
POWER SUPPLY 2
SLOT 7
Figure 1-3. SMS-758 Upper Front Section Interior
MN/SMS758 Rev. 3 1–5
Introduction SMS-758 Modem Protection Switch
UTS
INPUTS
BU MOD 2 BU MOD 1
MOD 1
MOD 2
MOD 3
MOD 4
MOD 5
MOD 6
MODULATOR SWITCH
OUTPUTS
IF 1
IF 2
IF 3
IF 4
IF 5
IF 6
DEMODULATOR SWITCH
INP
DOWNLINK 4
DOWNLINK 3
DOWNLINK 2
DOWNLINK 1
BACKUP DEMOD 1
INPUTS
DOWNLINK 4
DOWNLINK 3
MOD 7
MOD 8
IF 7
IF 8
BACKUP 2 IF OUTPUT BACKUP 1 IF OUTPUT
DOWNLINK 2
DOWNLINK 1
Figure 1-4. SMS-758 IF Switching Matrix
BACKUP DEMOD 2
1–6 MN/SMS758 Rev. 3
SMS-758 Modem Protection Switch Introduction
Figure 1-5. SMS-758 Block Diagram
MN/SMS758 Rev. 3 1–7
Introduction SMS-758 Modem Protection Switch
UPLINK 1
UPLINK 2
DOWNLINK 1
DOWNLINK 2
1:6
SPLITTER
75
75
75
75
75
12345
J28
J29
J30
OFF-LINE
IF OUTPUTS
J17 J27
J31
IF
SMS-758
MODULATOR
J18
J19
J20
J21
12345
75
6
7
8
J32
J33
J34
J35
INPUTS
SWITCH
J22
J23
J24
6
7
75
BACKUP MOD
12
J26 J36
J25
8
75
75
75
1:6
SPLITTER
INPUTS
DOWNLINK
BACKUP
DEMODS
DL1
J7
J11 1
DL2
J8
SMS-758
J16 2
75
75
75
75
DL3J9
DL1
DL2
DL3
DL4
DL4
J12
J13
J14
J10
J15
IF
DEMOD
SWITCH
PRIME MOD INPUTS IF OUTPUTS
MUST BE TERMINATED INTO 75 OHMS.
TX IF
RX IF
TX IF
RX IF
TX IF
RX IF
TX IF
1
PRIME MODEMS
J2J2J2
A1A2A3
INPUTS
2
J2
J2J2J2
A4
A5A6A7A8A9
3
J2
A10
RX IF
4
TX IF
RX IF
TX IF
1
BACKUP MODEMS
RX IF
2
NOTE: ALL UNUSED IF SWITCHING CONNECTIONS
PRIME MODEM
DATA
SWITCH
SMS-758
A5A6A7
A4
J1
J1J1J1
A8
J1
TERR DATA
A1A2A3
J1J1J1
TERMINAL
EQUIPMENT
Figure 1-6. Example System Configuration
1–8 MN/SMS758 Rev. 3
SMS-758 Modem Protection Switch Introduction
The switch consists of the following assemblies:
Assembly D escription Drawing No.
Chassis AS/1890 Controller Motherboard AS/1317 Data Switch Motherboard AS/1349 Monitor and Control AS/0356 Address Decoder/Driver AS/1048 Switch Driver AS/1316 IF Switch AS/1314 O/L Telemetry AS/0585 Display/Keypad AS/0540 Power Supply (2 each) AS/0584 DS-1 Prime Interface Switch AS/0893 8 Optional DS-1 Backup Interface Switch AS/0894 2 Optional V.35 Prime Interface Switch AS/0891 8 Optional V.35 Backup Interface Switch AS/0892 2 Optional RS-422 Prime Interface Switch AS/0890 8 Optional RS-422 Backup Interface Switch AS/0899 2 Optional IDR Prime Interface Switch (1:N) AS/0895 8 Optional IDR Backup Interface Switch (1:N) AS/0896 1 Optional IDR 45MB Prime Interface Switch AS/0936 8 Optional IBS/ASYNC Prime Interface Switch AS/1695 8 Optional IBS/ASYNC Backup Interface Switch AS/1694 2 Optional IDR Prime Interface Switch (2:N) AS/1877-1 8 Optional IDR Backup Interface Switch (2:N) AS/1879 2 Optional Drop & Insert daisy chain Interface Switch AS/1877-2 9 Optional
MN/SMS758 Rev. 3 1–9
Introduction SMS-758 Modem Protection Switch

1.4 Performance Specification

The operating specifications of the switch are described in Table 1-1.
Table 1-1. SMS-758 Performance Specification
Operation
Number of Online Modems Expandable from 1 to 8 with plug-in prime
interface switch modules (the modems can be of different data rates and interfaces, as long as the backup modems are compatible).
Number of Backup Modems Expandable from 1 to 2 with plug-in backup
interface switch modules (IDR AS/0895 interface limits the backup to one).
Data Interfaces DS-1 and G.703, V.35, RS-422/449/
MIL-STD-188-114, IBS, IDR, or D&I. IF Frequency Response 50 MHz to 180 MHz . Downlinks Each demodulator is configurable for 1 of 4 or
7 downlink connections. Uplinks Eight modulator outputs may be externally
combined/divided for any number of uplinks. Prime Modulator to Output Loss Less than 1 dB. Backup Modulator to Prime Output Loss Less than 1 dB. Manual Delay Switch-Over T ime:
Modulator Demodulator
Auto Delay Switch-Over Time:
Modulator Demodulator
Switch-Over Priority One of three priority levels av ailable
Remote Control Interfaces:
External control
Modem Control
Batteries M&C: NiCad, 30 day memory retention.
0 to 127.5 sec., in 0.5 sec. steps.
0 to 127.5 sec., in 0.5 sec. steps.
< 1 sec.
< 3 sweep periods of the back-up
demodulator.
independently for each modulator and
demodulator, if independent mod/demod
firmware is used. Modulators and
demodulators will switch simultaneously with
modem switch firmware.
RS-485 or RS-232C. Baud rates from 110 to
9600, Even or Odd parity, Addresses from
1 to 255.
RS-485, Baud rate 9600, Even parity,
Addresses from 1 to 255.
48 hr. charge time.
1–10 MN/SMS758 Rev. 3
SMS-758 Modem Protection Switch Introduction
Indicators:
Front Panel LEDs
48-character display
Alarm Reporting:
Controller Fault Alarm
System Fault Alarm
Demodulator Fault Alarm
Operational Modes Auto, Local, Remote, and Bypass. Controls Complete control of all M:N functions from the
Input Voltage 90 to 264 VAC (self-adjusting). Line Power 40W maximum when both power supplies are Line Frequency 47 to 63 Hz.
Size 19" W x 22" D x 12.20" H. Weight 50 lbs.
Power supply on, controller and power supply
alarm, demodulator system failure, modulator
system failure, low battery alarm, auto mode,
local mode, remote mode, and bypass mode.
Prime and backup modulator and
demodulator status (fault and online status),
active modulators and demodulators (prime
and backup), modem address, modem
interface, modem uplink and downlink,
priority, delay, configuration, and fault menus.
Form C relay contact to indicate controller or
power supply failure.
Form C relay contact to indicate any non-
catastrophic failure.
Form C relay contact to indicate all
demodulators faulted and a probable IF loss.
front panel, or through the remote interface.
General
-48 VDC optional.
operating.
MN/SMS758 Rev. 3 1–11
Introduction SMS-758 Modem Protection Switch
This page is intentionally left blank.
1–12 MN/SMS758 Rev. 3
This chapter consists of:
CAUTION

2.1 Unpacking

The switch and manual are packaged in pre-formed, reusable, cardboard cartons containing foam spacing for maximum shipping protection. To remove the switch:
Chapter 2.
INSTALLATION
• Unpacking instructions
• System installation
• System requirements
• Description of the external connections
The equipment contains parts and assemblies sensitive to damage by
!
Electrostatic Discharge (ESD). Use ESD precautionary procedures when touching, removing, or inserting printed circuit boards.
Do not use any cutting tool that will extend more than 1” into the container
!
CAUTION
MN/SMS758 Rev. 3 2–1
and cause damage to 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 switch.
3. Remove the switch, manual, and power cord from 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 further system installation instructions.
Installation SMS-758 Modem Protection Switch

2.2 System Installation

2.2.1 Switch Setup

After unpacking, refer to the following steps to install the switch:
1. Mount the switch chassis in the assigned position of the equipment rack. It is recommended that the switch be supported by a rack-mounted shelf.
2. Be sure that all interface switch modules are in their proper positions, and are fully seated in the rear backplane.
3. Connect the cables to the proper locations on the rear panel. Refer to Section 2.4 for connector pinouts, placement, and function.
4. Open the front panel and verify that the two power supplies and four circuit modules are properly seated in the upper backplane.
5. Before turning the power switch ON, become familiar with front panel operation in Chapter 3.
6. Turn ON each power supply, located inside the front panel. The power switch is ON when the switch is depressed toward the “1”, or when the red side of the switch is exposed.
7. Close the front panel, and configure the switch as described in Section 3.2. Place the switch in the proper mode for operation.
8. If any installation problems occur, refer to Chapter 5 for troubleshooting the system.
2–2 MN/SMS758 Rev. 3
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