Comtech EF Data SMS-458B User Manual
SMS-458B
Modem Protection Switch
Installation and Operation Manual
Part Number MN/SMS458B. IOM Revision 2
Comtech EF Data is an ISO 9001
Registered Company.
SMS-458B
Modem Protection Switch
Installation and Operation Manual
Part Number MN/SMS458B.IOM
Revision 2
August 4, 2003
SMS-458B Modem Protection Switch Revision 2
Preface MN/SMS458B.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
480 333.2200 (Main Comtech EF Data Number)
480 333.4357 (Customer Support Desk)
480 333.2161 FAX
or, E-Mail can be sent to the Customer Support Department at:
service@comtechefdata.com
Contact us via the web at www.comtechefdata.com
To return a Comtech EF Data product (in-warranty and out-of-warranty) for repair or
replacement:
1. Request a Return Material Authorization (RMA) number from the Comtech EF
Data Customer Support Department.
Be prepared to supply the Customer Support 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 Comtech EF Data. (Shipping charges should be
prepaid.)
For more information regarding the warranty policies, see Warranty Policy, p. xiii
.
ii
Table of Contents
CHAPTER 1. INTRODUCTION.................................................................................. 1–1
1.1 Overview.......................................................................................................................................................1–1
1.2 Purpose and Function..................................................................................................................................1–2
1.3 Description....................................................................................................................................................1–4
1.4 Major Assemblies.........................................................................................................................................1–8
1.5 System Requirements...................................................................................................................................1–8
1.6 Specification..................................................................................................................................................1–9
CHAPTER 2. INSTALLATION................................................................................... 2–1
2.1 Unpacking.....................................................................................................................................................2–1
2.2 Rack Installation..........................................................................................................................................2–2
2.3 External Connections...................................................................................................................................2–4
2.3.1 Data I/O ..................................................................................................................................................2–6
2.3.2 Remote Interface (J1, J2, J3) ..................................................................................................................2–7
2.3.3 Online Status (J4, J5)..............................................................................................................................2–7
2.3.4 Relay-Remote/Fault (J6).........................................................................................................................2–8
2.3.5 Downlink Inputs (J7 to J10, J12 to J15).................................................................................................2–9
2.3.6 Back-Up Demods (J11, J16)...................................................................................................................2–9
2.3.7 Prime Mod Inputs (J18 to J25) ...............................................................................................................2–9
2.3.8 Back-Up Mod Inputs (J26, J36)..............................................................................................................2–9
2.3.9 Offline IF Outputs (J17, J27) ................................................................................................................2–10
2.3.10 IF Outputs (J28 to J35).......................................................................................................................2–10
2.3.11 AC Power (J37, J38)...........................................................................................................................2–10
2.3.12 Ground................................................................................................................................................2–10
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CHAPTER 3. FRONT PANEL OPERATION ............................................................. 3–1
3.1 Overview.......................................................................................................................................................3–1
3.2 LED Indicators.............................................................................................................................................3–2
3.3 Keypad and LCD Display............................................................................................................................3–3
3.4 System and Modem Setup...........................................................................................................................3–7
3.4.1 Prime Uplink and Downlink Ports..........................................................................................................3–7
3.4.2 System Setup ..........................................................................................................................................3–7
3.4.2.1 Time and Date Menu.......................................................................................................................3–8
3.4.2.2 Active Downlink Option Menu....................................................................................................... 3–8
3.4.2.3 Active Prime Modulators Menu......................................................................................................3–9
3.4.2.4 Active Prime Demodulators Menu..................................................................................................3–9
3.4.2.5 Active Backup Modulators Menu ...................................................................................................3–9
3.4.2.6 Active Backup Demodulators Menu...............................................................................................3–9
3.4.2.7 Modem Addresses Menu.................................................................................................................3–9
3.4.2.8 Prime Channel Unit Menu.............................................................................................................3–10
3.4.2.9 Backup Channel Unit Menu..........................................................................................................3–10
3.4.3 Modem Setup........................................................................................................................................3–10
3.4.3.1 Downlink Selection Menu.............................................................................................................3–11
3.4.3.2 Demodulator Priorities Menus ......................................................................................................3–11
3.4.3.3 Modulator Priorities Menus...........................................................................................................3–11
3.4.3.4 Demodulator Delay .......................................................................................................................3–12
3.4.3.5 Modulator Delay............................................................................................................................3–12
3.4.3.6 Channel Unit Selection..................................................................................................................3–13
3.4.4 Modem Configuration...........................................................................................................................3–13
3.4.4.1 Prime and Backup Modem Configuration.....................................................................................3–13
3.4.4.2 Modem Configuration Menu.........................................................................................................3–14
3.4.5 Operation Modes ..................................................................................................................................3–15
3.4.5.1 Bypass Mode.................................................................................................................................3–15
3.4.5.2 Auto Mode.....................................................................................................................................3–15
3.4.5.3 Local Mode....................................................................................................................................3–18
3.4.5.4 Remote Mode................................................................................................................................3–18
3.4.6 Faults ....................................................................................................................................................3–19
3.4.6.1 Modulator Operation Fault............................................................................................................3–22
3.4.6.2 Demodulator Operation Fault........................................................................................................3–22
3.4.6.3 M:N Faults.....................................................................................................................................3–22
3.4.6.4 Battery Faults ................................................................................................................................3–23
3.4.7 Front Panel Theory of Operation..........................................................................................................3–23
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CHAPTER 4. THEORY OF OPERATION.................................................................. 4–1
4.1 Monitor and Control....................................................................................................................................4–1
4.1.1 General....................................................................................................................................................4–1
4.1.2 Description of Options............................................................................................................................4–2
4.1.2.1 M&C Serial Interface......................................................................................................................4–2
4.1.2.2 Remote Baud Rate...........................................................................................................................4–3
4.1.2.3 Remote Address ..............................................................................................................................4–3
4.1.2.4 External Remote Serial Interface Selection.....................................................................................4–4
4.1.2.5 Battery.............................................................................................................................................4–4
4.1.2.6 Error Response Switch....................................................................................................................4–5
4.1.2.7 External I/O Interrupt Arbitration ...................................................................................................4–5
4.1.3 Modem Control Interface Specification..................................................................................................4–5
4.1.4 Relay-Remote Interface Specification....................................................................................................4–6
4.1.4.1 Scope...............................................................................................................................................4–6
4.1.4.2 General............................................................................................................................................4–6
4.1.4.3 Command Structure.........................................................................................................................4–6
4.1.5 Fault Interface Specification...................................................................................................................4–9
4.1.5.1 Controller Fault .............................................................................................................................4–10
4.1.5.2 M:N Fault......................................................................................................................................4–10
4.1.5.3 Demodulator Signal Fault..............................................................................................................4–10
4.1.6 Online Status Specification...................................................................................................................4–10
4.1.7 Monitor and Control Theory of Operation ...........................................................................................4–11
4.2 Interface Switches ......................................................................................................................................4–11
4.2.1 IDR/G.703 Interface Switch.................................................................................................................4–11
4.2.1.1 General Description.......................................................................................................................4–11
4.2.1.2 Specification (IDR/G.703) ............................................................................................................4–12
4.2.1.3 Connector Pinout...........................................................................................................................4–13
4.3 Address Decoder/Driver............................................................................................................................4–15
4.3.1 General..................................................................................................................................................4–15
4.3.2 Specifications........................................................................................................................................4–16
4.3.3 Address Decoder/Driver Theory of Operation .....................................................................................4–17
4.4 IF Switch Driver.........................................................................................................................................4–18
4.5 Data Switch Controller Card....................................................................................................................4–19
4.6 IF Switch.....................................................................................................................................................4–20
4.6.1 General..................................................................................................................................................4–20
4.6.2 Specifications........................................................................................................................................4–20
4.6.3 IF Switch Theory of Operation.............................................................................................................4–20
4.7 Online Telemetry........................................................................................................................................4–22
4.7.1 General..................................................................................................................................................4–22
4.7.2 Specifications........................................................................................................................................4–22
4.7.3 Online Telemetry Theory of Operation ................................................................................................4–22
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4.8 Power Supply..............................................................................................................................................4–24
4.8.1 General..................................................................................................................................................4–24
4.8.2 Specifications........................................................................................................................................4–24
CHAPTER 5. MAINTENANCE................................................................................... 5–1
5.1 Fault Descriptions ........................................................................................................................................5–1
5.1.1 General....................................................................................................................................................5–1
5.1.2 Modulator Operation Fault .....................................................................................................................5–1
5.1.3 Demodulator Operation Fault.................................................................................................................5–2
5.1.4 M:N Faults..............................................................................................................................................5–2
5.1.5 Battery Faults..........................................................................................................................................5–3
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 General....................................................................................................................................................5–7
5.3.2 Power Supply..........................................................................................................................................5–7
5.3.3 IF Switch.................................................................................................................................................5–8
5.3.4 Switch Driver..........................................................................................................................................5–8
5.3.5 Address Decoder/Driver.........................................................................................................................5–8
5.3.6 Monitor and Control...............................................................................................................................5–8
5.3.7 Online Telemetry....................................................................................................................................5–8
5.3.8 Interface Switches...................................................................................................................................5–8
5.3.9 Data Switch Controller ...........................................................................................................................5–9
APPENDIX A. CABLING CONFGIURATIONS..........................................................A–1
A.1 General........................................................................................................................................................A–1
A.2 SDM-2020 Modulator (TX only) with ECL/HSSI Data Interface.........................................................A–3
A.3 SDM-2020 Modulator (TX only) with G.703 Data Interface .................................................................A–6
A.4 SDM-9000 Satellite Modem with 50-Pin Data Interface .......................................................................A–9
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APPENDIX B. REMOTE CONTROL OPERATION: INDEPENDENT MOD/DEMOD B–1
B.1 General........................................................................................................................................................B–1
B.2 Message Structure...................................................................................................................................... B–1
B.3 Start Character...........................................................................................................................................B–2
B.4 Device Address............................................................................................................................................ B–2
B.5 Command/Responses ................................................................................................................................. B–2
B.6 End of Message Character......................................................................................................................... B–3
B.7 Modulator Configuration Commands/Responses ................................................................................... B–3
B.8 Backup Modulator Configuration Commands/Responses .....................................................................B–4
B.9 Demodulator Configuration Commands/Responses............................................................................... B–5
B.10 Backup Demodulator Configuration Commands/Responses............................................................... B–5
B.11 Modem Configuration Commands/Responses....................................................................................... B–7
B.12 Status Commands/Responses..................................................................................................................B–7
B.13 Operational Commands...........................................................................................................................B–9
B.14 Load Modem Configurations ................................................................................................................ B–10
B.15 Verify Modem Configuration(s)............................................................................................................. B–10
B.16 Operational Status Commands (Faults)...............................................................................................B–11
GLOSSARY ............................................................................................................. g–1
INDEX ........................................................................................................................ i–1
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Figures
Figure 1-1. SMS-458B.....................................................................................................................................1–1
Figure 1-2. System Block Diagram .................................................................................................................1–3
Figure 1-3. SMS-458B Upper-front Section Interior.......................................................................................1–5
Figure 1-4. SMS-458B IF Switching Matrix...................................................................................................1–5
Figure 1-5. Lower Section Interconnect Diagram ...........................................................................................1–6
Figure 1-6. SMS-458B Block Diagram...........................................................................................................1–7
Figure 2-1. Typical Switch Rack Installation ..................................................................................................2–3
Figure 2-2. SMS-458B Rear Panel View.........................................................................................................2–5
Figure 3-1. SMS-458B Front Panel View .......................................................................................................3–2
Figure 3-2. Display Map..................................................................................................................................3–5
Figure 3-3. SMS-458B Switching Algorithm Flow Chart Demodulator/Modem .........................................3–20
Figure 3-4. SMS-458B Switching Algorithm Flow Chart Modulator...........................................................3–21
Figure 4-1. Monitor and Control .....................................................................................................................4–2
Figure 4-2. Prime IDR/G.703 Interface Switch.............................................................................................4–14
Figure 4-3. Backup IDR/G.703 Interface Switch ..........................................................................................4–14
Figure 4-4. Address Decoder/Driver..............................................................................................................4–15
Figure 4-5. Address Decoder/Driver .............................................................................................................4–16
Figure 4-6. Switch Driver..............................................................................................................................4–18
Figure 4-7. IF Switch Driver Block Diagram................................................................................................4–18
Figure 4-8. Data Switch Controller Card.......................................................................................................4–19
Figure 4-9. IF Switch.....................................................................................................................................4–21
Figure 4-10. Online Telemetry ......................................................................................................................4–22
Figure 4-11. Online Telemetry Block Diagram.............................................................................................4–23
Figure A-1. SMS-458B for SDM-2020 Modulator (TX only) with ECL/HSSI Data Interface ....................A–4
Figure A-2. SMS-458B for SDM-2020 Modulator (TX only) with ECL/HSSI Data Interface.....................A–5
Figure A-3. SMS-458B for SDM-2020 Modulator (TX only) with G.703 Data Interface.............................A–7
Figure A-4. SMS-458B for SDM-2020 Modulator (TX only) with G.703 Data Interface.............................A–8
Figure A-5. SMS-458B for SDM-9000 Satellite Modem with 50-Pin Data Interface .................................A–10
Figure A-6. SMS-458B for SDM-9000 Satellite Modem with 50-Pin Data Interface .................................A–11
Tables
Table 1-1. SMS-458B Specification................................................................................................................1–9
Table 2-1. Rear Panel Connections..................................................................................................................2–4
Table 4-1. Relay-Remote Command Words....................................................................................................4–7
Table 4-2. Modem Target Words ....................................................................................................................4–7
Table 4-3. Relay-Remote Command Functions...............................................................................................4–8
Table 4-4. Relay-Remote Command Examples...............................................................................................4–9
Table A-1. Equipment List .............................................................................................................................A–2
Table A-2. Cable Assembly............................................................................................................................A–3
Table A-3. Cable Connection .........................................................................................................................A–3
Table A-4. Cable Assembly............................................................................................................................A–6
Table A-5. Cable Connection .........................................................................................................................A–6
Table A-6. Cable Assembly............................................................................................................................A–9
Table A-7. Cable Connection .........................................................................................................................A–9
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About this Manual
This manual provides installation and operation information for the Comtech EF Data
SMS-458B Modem Protection Switch. This a technical document intended for earth
station engineers, technicians, and operators responsible for the operation and
maintenance of the SMS-458B..
Related Documents
The following documents are referenced in this manual:
• Department of Defense (DOD) MIL-188-114A, “Electrical Characteristics of
Digital Interface Circuits”
• Comtech EF Data, SDM2020 Modulator, Rev. 4 dated, September 15, 1999
Installation and Operation Manual
• Comtech EF Data, SDM-9000, Rev. 4, dated, May 5, 1997 Installation and
Operation Manual
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
unsafe practices or risks of property damage.
WARNING indicates a potentially hazardous situation that, if not avoided,
could result in death or serious injury.
WARNING
IMPORTANT indicates a statement that is associated with the task
IMPORTANT
being performed.
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Preface MN/SMS458B.IOM
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 have been superseded by the new designation
of the Electronic Industries Association (EIA). References to the old designations are
shown only when depicting actual text displayed on the screen of the unit (RS-232, RS485, etc.). All other references in the manual will be shown with the EIA designations
(EIA-232, EIA-485, etc.) only.
Trademarks
Other 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.
Overview of Changes Made to Revision 1
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ELECTRICAL SAFETY
The SMS-458B Modem Protecrtion Switch has been shown to comply with the following safety
standard:
• EN 60950: Safety of Information Technology Equipment, including electrical business
machines.
The equipment is rated for operation over the range 90 to 264 volts AC. It has a maximum
power consumption of 160 watts.
FUSES
The SMS-458B Modem Protecrtion Switch is fitted with two fuses, one each for line and neutral
connections. These are contained within the body of the IEC power connector, behind a small
plastic flap.
• For 230 volt AC operation, use T0.75A, 20mm fuses.
• For 115 volt AC operation, use T1.25A fuses, 20mm fuses.
IMPORTANT
Environmental
The SMS-458B Modem Protecrtion Switch must not be operated in an environment
where the unit is exposed to extremes of temperature outside the ambient range 0 to 50°C
(32 to 122°F), precipitation, condensation, or humid atmospheres above 95% RH,
altitudes (un-pressurized) greater than 2000 meters, excessive dust or vibration,
flammable gases, corrosive or explosive atmospheres.
Operation in vehicles or other transportable installations that are equipped to provide a
stable environment is permitted. If such vehicles do not provide a stable environment,
safety of the equipment to EN60950 may not be guaranteed.
For continued operator safety, always replace the fuses with the
correct type and rating.
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Installation
The installation and connection to the line supply must be made in compliance to local or
national wiring codes and regulations.
The SMS-458B Modem Protecrtion Switch is designed for connection to a power system
that has separate ground, line and neutral conductors. The equipment is not designed for
connection to power system that has no direct connection to ground.
The SMS-458B Modem Protecrtion Switch is shipped with a line inlet cable suitable for
use in the country of operation. If it is necessary to replace this cable, ensure the
replacement has an equivalent specification. Examples of acceptable ratings for the cable
include HAR, BASEC and HOXXX-X. Examples of acceptable connector ratings include
VDE, NF-USE, UL, CSA, OVE, CEBEC, NEMKO, DEMKO, BS1636A, BSI, SETI,
IMQ, KEMA-KEUR and SEV.
International Symbols:
Symbol Definition Symbol Definition
~
Alternating Current
Fuse
Telecommunications Terminal Equipment Directive
In accordance with the Telecommunications Terminal Equipment Directive 91/263/EEC,
this equipment should not be directly connected to the Public Telecommunications
Network.
Protective Earth
Chassis Ground
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EMC (Electromagnetic Compatibility)
In accordance with European Directive 89/336/EEC, the SMS-458B Modem Protecrtion
Switch has been shown, by independent testing, to comply with the following standards:
Emissions: EN 55022 Class B - Limits and methods of measurement of radio
interference characteristics of Information Technology Equipment.
(Also tested to FCC Part 15 Class B)
Immunity: EN 50082 Part 1 - Generic immunity standard, Part 1: Domestic,
commercial and light industrial environment.
Additionally, the SDM-2020D has been shown to comply with the following standards:
EN 61000-3-2 Harmonic Currents Emission
EN 61000-3-3 Voltage Fluctuations and Flicker
EN 61000-4-2 ESD Immunity
EN 61000-4-4 EFT Burst Immunity
EN 61000-4-5 Surge Immunity
EN 61000-4-6 RF Conducted Immunity
EN 61000-4-8 Power frequency Magnetic Field Immunity
EN 61000-4-9 Pulse Magnetic Field Immunity
EN 61000-4-11 Voltage Dips, Interruptions, and Variations Immunity
EN 61000-4-13 Immunity to Harmonics
In order that the Modem continues to comply with these standards,
observe the following instructions:
IMPORTANT
• Connections to the transmit and receive IF ports (Type N and Type F, female,
connectors) should be made using a good quality coaxial cable - for example
RG58/U (50Ω) or RG59/U (75Ω).
• All 'D' type connectors attached to the rear panel must have back-shells that
provide continuous metallic shielding. Cable with a continuous outer shield
(either foil or braid, or both) must be used, and the shield must be bonded to the
back shell.
• The equipment must be operated with its cover on at all times. If it becomes
necessary to remove the cover, the user should ensure that the cover is correctly
re-fitted before normal operation commences.
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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 you have any questions regarding your equipment or the information in this manual,
please contact the Comtech EF Data Customer Support Department.
xiv
Chapter 1. INTRODUCTION
This chapter describes the SMS-458B Modem Protection Switch (Figure 1-1), referred to
in this manual as “the switch,”.
1.1 Overview
The SMS-458B Modem Protection Switch is a rack-mounted unit that provides
independent backup control for modulators and demodulators, or simultaneous modulator
and demodulator (modem) switching. The switch limits the loss of communication if a
primary modem element failure occurs.
Figure 1-1. SMS-458B
1–1
SMS-458B Modem Protection Switch Revision 2
Introduction MN/SMS458B.IOM
1.2 Purpose and Function
The switch is a fully-automated, self-contained, switching unit for the following
equipment:
• SDM-2020 (Modulator) Satellite Modem
• SDM-2020 (Demodulator) Satellite Modem
• SDM-9000 Satellite Modem
The switch is designed to interface with ASI, G.703, or compatible data streams.
One backup modem provides redundancy for up to four prime modems. The switch will
automatically or manually switch one backup modem to take the place of any of four
prime modems.
In normal operation, each prime modem input is fed through to its corresponding IF
output, and the backup modems are fed to the offline IF outputs. When a modem fault is
detected, the faulted modem is switched offline and re-routed to one of the offline IF
outputs. The backup modem is configured identically to the failed modem and is
switched in its place, unless the backup modem is already backing up a prime of equal or
greater priority.
The switch does not contain an IF signal combining/dividing section, so that the user may
externally tailor the combiner/divider loss for a minimum configuration per application.
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
1–2
SMS-458B Modem Protection Switch Revision 2
Introduction MN/SMS458B.IOM
FROM
DOWNLINK
TO
UPLINK
AND
STATUS REPORTING
REMOTE CONTROL
INTF
RS-485 EXT INTF
RS-232 EXT INTF
MODEM CNTL
J1J2J3J4J5
J10
J11
J9
RX CLK
RX DATA
EQUIPMENT
J29
J30
J31
MOD PRIME 2
MOD PRIME 3
MOD OL STATUS
J12
TX DATA
MOD PRIME 4
DEMOD OL STATUS
REMOTE/FAULT
J6
J18 MOD PRIME 1 J28
J19
J20
J21
J13
J8
J7
SCT
FAULT
TX CLK
REMOTE
INPUTS
DEMOD
DOWNLINK
FOR BACKUP EQUIPMENT
J7
J8
J9
J10
DOWNLINK 1
DOWNLINK 2
DOWNLINK 3
DOWNLINK 4
MOD BACKUP
J26
J10
J9
RX CLK
RX DATA
DEMOD BACKUP
J11
J11
J12
J13
J7
J8
SCT
FAULT
TX CLK
TX DATA
REMOTE
ALL UNUSED
NOTE:
CONNECTIONS MUST BE
IF SECTION
SMS-458B
AC1
AC2
CGND TERMINATED INTO 75 OHMS.
AC1
AC2
GND
90-264 VAC
90-264 VAC
J10
J9
J12
J13
J11
RX CLK
TX CLK
TX DATA
RX DATA
EQUIPMENTTOTERMINAL
FROM
DOWNLINK
EQUIPMENT
A5,J2
A7,J1
A1,J2
A3,J1
A3,J2
123
123
A1,J4
A3,J3
A3,J4
A5,J1
A5,J3
RXTXRX
A5,J4
A7,J3
A7,J2
4
BK/UP
MODEM
4
A7,J4
A10,J1
A10,J2
J11
J12
J13
J9
J10
SCT
TX CLK
RX CLK
TX DATA
RX DATA
SMS-458B
DATA SECTION
DEMOD PRIME 1
DEMOD PRIME2DEMOD PRIME3DEMOD PRIME 4
A2,J6
A4,J6
A6,J6
A8,J6
A10,J3
J7
J8
FAULT
REMOTE
J9
RX DATA
J7
J8
J11
J10
J12
J13
SCT
FAULT
TX CLK
RX CLK
REMOTE
TX DATA
A1,J1
TERR
INTRFC
TXRXTXRXTX
PRIME
MODEMS
A1,J3
J7
J8
SCT
FAULT
REMOTE
PRIME 1
IF
AC1ACGRND
TX
RX IF
CP1
CP2
120 VAC
PRIME 2
TX IF
SDM-XXXX
GND
RX IF
AC
CP1
CP2
PRIME 3
AC1
GRND
GND
120 VAC
TX IF
RX IF
SDM-XXXX
AC1
AC
GND
CP1
CP2
120 VAC
PRIME 4
TX IF
RX IF
GRND
SDM-XXXX
AC1
AC
GND
CP1
CP2
120 VAC
BACKUP 1
TX IF
RX IF
AC1
GRND
SDM-XXXX
GRND
SDM-XXXX
AC
GND
CP1
CP2
120 VAC
Figure 1-2. System Block Diagram
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SMS-458B Modem Protection Switch Revision 2
Introduction MN/SMS458B.IOM
1.3 Description
The switch is complete and self-contained in a standard 19-inch (48 cm) rack-mounted
enclosure weighing approximately 50 lbs (22.68 kg). Modular construction methods were
used for ease in replacing modules.
The chassis assembly is segmented with upper and lower chassis-mounted backplanes.
The top section (Figure 1-3) contains:
• Two power supplies and four printed circuit board (PCB) assemblies, providing:
! Front panel keypad and display accessible from the front panel.
! Serial remote interfaces, relay-remote/fault, status, and IF connections
accessible from the rear panel. Refer to Figure 1-4 for a block diagram of the
IF switching matrix.
The lower section (Figure 1-5) contains:
• High-speed data switching matrix and matrix driver.
• Data switch interface modules accessible from the rear.
Refer to Figure 1-6 for the interconnect diagram of the lower section.
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.
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.
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SMS-458B Modem Protection Switch Revision 2
Introduction MN/SMS458B.IOM
BU MOD 1
MOD 1
MOD 2
SLOT 1
POWER SUPPLY
SLOT 3
SWITCH DRIVER
SLOT 2
SLOT 4
ADDRESS DEC/DRVNOT USED
MONITOR AND CONTROL
SLOT 5
ONLINE TELEMETRY
SLOT 6
POWER SUPPLY 2
SLOT 7
Figure 1-3. SMS-458B Upper-Front Section Interior
IF 1
IF 2
INPUTSOUTPUTS
DOWNLINK 4
DOWNLINK 3
DOWNLINK 2
DEMODULATOR SWITCH
MOD 3
MOD 4
IF 3
IF 4
DOWNLINK 1
BACKUP DEMOD 1
DEMODULATOR SWITCH
BACK-UP 1 IF OUTPUT
Figure 1-4. SMS-458B IF Switching Matrix
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SMS-458B Modem Protection Switch Revision 2
Introduction MN/SMS458B.IOM
TX DATA
J1
RX DATA
J2
J3
BACKUP
MODEM
J27
J18
J17
TERR
J28
J26
J25
J5
J6
PRIME 4
TX
TERR
RX
TX
MODEM
RX
PRIME 3
J1
J5
J2
J3
J6
J4
JP1
TX
TERR
RX
TX
MODEM
RX
JP2
J1
J2
J3
J4
PRIME 2
J5
J6
TX
TERR
RX
TX
MODEM
RX
J1
J2
J3
J4
J30 J31
J19
J20
J5
J6
J11
J12
PRIME 1
TX
TERR
RX
TX
MODEM
RX
J1
J2
J3
J4
J16
J15
AS/1314-1
RX DATA
SWITCH
J24
J23
JP3
DATA SWITCH
CONTROLLER
AS/2031
J2
J1
Figure 1-5. Lower Section Interconnect Diagram
J21
J22
AS/1314-1
TX DATA
SWITCH
J13
J14
J27J28
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SMS-458B Modem Protection Switch Revision 2
Introduction MN/SMS458B.IOM
Figure 1-6. SMS-458B Block Diagram
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SMS-458B Modem Protection Switch Revision 2
Introduction MN/SMS458B.IOM
1.4 Major Assemblies
The switch consists of the following assemblies:
Assembly Description Part No. QTY
Chassis AS/2040-1
Controller Motherboard AS/1317
Data Switch Motherboard AS/2034
Data Switch Controller AS/2031 2 each
Monitor and Control AS/0356
Address Decoder/Driver AS/1048
IF Switch Driver AS/1316
IF Switch AS/1314
O/L Telemetry AS/0585
Display/Keypad AS/0540
Power Supply AS/1508-1 2 each
Prime Interface Switch AS/2068 up to 4
Backup Interface Switch AS/2069 1 each
1.5 System Requirements
With all interface switch modules installed, the switch is capable of operation as a 1:4
protection switch (i.e., one full-duplex standby modem can back up four full-duplex
primary modems).
The switch can be configured in any combination including:
• TX only modems
• RX only modems
• Multiple downlinks (limited to 4)
Refer to Section 3.1 for a complete explanation of the configuration function.
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Introduction MN/SMS458B.IOM
1.6 Specification
The operating specifications for the switch are described in Table 1-1.
Table 1-1. SMS-458B Specification
Operation
Number of Online Modems Expandable from 1 to 4 with plug-in prime
interface switch modules (the modems can be of
different data rates as long as the backup modems
are compatible).
Number of Backup Modems 1 backup modem with a plug-in backup interface
switch module.
Data Interfaces ASI
ECL
G.703
Return Loss > 15 dB.
IF Frequency Response 50 to 180 MHz.
Downlinks Each demodulator is configurable for 1 of 4
downlink connections.
Prime Modulator to Output Loss
Backup Modulator to Prime Output Loss
Manual Delay Switch-Over Time Modulator: 0 to 127.0 sec., in 0.5 sec. steps
Auto Delay Switch-Over Time Modulator: < 1 sec
Switch-over Priority 1 of 3 priority levels independent for each
Remote Control Interfaces External control: EIA-485 or EIA-232
Batteries M&C: NiCad, 30-day memory retention.
Alarm Reporting Controller Fault Alarm: Form-C relay contact to
≤ 1 dB
≤ 1 dB
Demodulator: 0 to 127.0 sec., in 0.5 sec. steps
Demodulator: < 3 sweep periods of the back-up
demodulator.
modulator and demodulator (modulators and
demodulators may switch simultaneously in certain
applications).
Baud rates from 110 to 9600.
Parity: Even or Odd.
Addresses from 1 to 255.
48 hr. charge time.
indicate controller or power supply failure.
System Fault Alarm: Form-C relay contact to
indicate any non-catastrophic failure.
Demodulator Fault Alarm: Form-C relay contact to
indicate all demodulators faulted and a probable IF
loss.
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Introduction MN/SMS458B.IOM
Table 1-1. SMS-458B Specification (Continued)
Indicators Front panel LEDs:
• Power supply on
• Auto mode
• Local mode
• Remote mode
• Bypass mode
• Battery fault
• Modulator system failure
• Demodulator system failure
• Controller and power supply fault
48 character display of:
• Prime modulator status
• Prime demodulator status
• Backup demodulator status
• Backup modulator status
• Active modulators (prime and backup)
• Active demodulators (prime and backup)
• Modem address
• Modem interface
• Modem downlink
• Modem priority
• Modem delay
• Modem configuration
• Fault menus
Operation Modes Auto
Local
Remote
Bypass
Controls Complete control of all M:N functions from the
front panel or through the remote interface.
General
Input Voltage 90 to 264 VAC (-48 Vdc optional).
Line Power 160 W max. with both power supplies operating.
Line Frequency 47 to 63 Hz
Size 19 W x 22D x 12.20H inches
(48.2 6W x 55.88 D x 31H cm)
Weight 50 lbs (22.68 kg)
1–10
Chapter 2. INSTALLATION
This chapter provides the information reflecting unpacking, external connections, and
installation.
2.1 Unpacking
The switch and manual are packaged in preformed reusable foam inside a cardboard
carton.
To remove the switch, proceed as follows:
Do not use any cutting tool that will extend more than 1 inch into the
container and cause damage to the switch.
CAUTION
CAUTION
1. Cut the tape at the top of the carton and open the flaps.
The switch weights 50 lbs. (22.68 kg). Use caution when lifting the switch
out of the carton to avoid bodily injury.
2. Lift off the preformed foam packing and remove the manual and the unit.
3. Save the packing material for reshipment either back to the factory or to another
site.
4. Inspect the equipment for damage incurred during shipment.
5. Check the equipment against the packing list shipped with the equipment to
ensure that the shipment is complete.
2.2 Rack Installation
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SMS-458B Modem Protection Switch Revision 2
Installation MN/SMS458B.IOM
Install the switch in the rack (Figure 2-1) as follows:
1. Be sure that all interface switch modules are in their proper positions and are
fully seated in the rear backplane.
2. Mount the switch in the customer-selected position in the equipment rack. Secure
using eight mounting bolts and washers.
3. Turn front panel knob and open the front panel. Verify that the two power
supplies and four circuit modules are properly seated in the upper backplane.
4. Prior to turning on the power switches, read and become familiar with Chapter 3,
Front Panel Operation.
5. Turn on each power supply POWER switch located inside the front panel. The
power switch is on when the switch is depressed toward the “1” symbol or when
the red-side of the switch is exposed.
6. Close the front panel by securing the front panel knob. Configure the switch as
described in Chapter 3. Place the switch in the proper mode for operation.
7. Connect all appropriate connectors to the switch rear panel connectors as
specified in Appendix A.
8. If any problems occur during installation or operation, refer to Chapter 5 for
troubleshooting information.
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SMS-458B Modem Protection Switch Revision 2
Installation MN/SMS458B.IOM
EQUIPMENT RACK
SMS-458 SWITCH
MOUNTING
BOLTS AND
WASHERS
MOUNTING
BOLTS AND
WASHERS
Figure 2-1. Typical Switch Rack Installation
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SMS-458B Modem Protection Switch Revision 2
Installation MN/SMS458B.IOM
2.3 External Connections
All connections between the switch and other equipment are made through rear panel
connections. Table 2-1 lists these connectors, and Figure 2-2 shows their locations. The
uses of these connectors are described in the following sections.
Table 2-1. Rear Panel Connections
Name
DATA I/O MODULES J5, J6
REMOTE J1, J2, J3 9-pin D Remote Interface
ON-LINE STATUS J4, J5 25-pin D Online Status Reporting
RELAY/REMOTE FAULTS J6 25-pin D Relay/Remote and Faults
DOWNLINK INPUTS J7 to J10,
BACK-UP DEMODS J11, J16 BNC Downlink Outputs to Backup
PRIME MOD INPUTS J18 to J25 BNC Modulator IF Inputs
BACK-UP MOD INPUTS J26, J36 BNC Backup Mod IF Inputs
OFF-LINE IF OUTPUTS J17, J27 BNC Offline Mod IF Outputs
IF OUTPUTS J28 to J35 BNC IF Outputs to Uplinks
AC POWER J37, J38 CEE22 AC Power Input
GROUND J39 #10-32 stud Chassis Ground
Ref Desig
J1 – J4
J12 to J15
Connector
Type
50-pin D BNC
BNC
BNC Downlink IF Inputs
Function
Mod, Demod Faults
G.703, ECL/HSSI, I/O
Demods
Note: All unused BNC connectors must have a 75 Ω termination.
2–4
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