The following changes provide updated information for Figure2-2. This information will be
incorporated into the next revision.
Changes to Table 3-4 (Interface Configuration Jumper Settings)
October 5, 2001
SMS-7000 Modem Protection Switch
Installation and Operation Manual,
Revision 3, September 30, 1999
MN/SMS7000.EA3
Attach this page to page 2-11
Change Specifics:
See following page…….
Filename: T_ERRATA
1
10-32x ½
Socket Head
Screw (4)
Latch
Striker
Plate
FP/5154
Fiber
Washers
(2)
Left Hinge
Mounting
Plate
FP/5152-2
Black
Latch
Knobs
LATCH04
(2)
1/4-20x1/4
Socket Head
Shoulder
Screw (2)
Hinge
Base
FP/5151
#10 Flat
Washers
(4)
IFU
DSU
Hinge
Latch
Panel
FP/5153
Fiber
Washers
(2)
Latch
Striker
Plate
FP/5154
Filename: T_ERRATA
Remove the Po wer Supplies
to install from the inside:
#10 Flat Washer s(4)
(4) 10-32x ½ So cket Head scre ws
Right Hinge
Mounting
Plate
FP/5152-1
Figure 0-1. Back Mount (Hinge) Installation
2
1/4-20x1/4
Socket
Head
Shoulder
Screw (2)
Comtech EFData Documentation Update
Subject:
Date:
Document:
Part Number:
Collating Instructions:
Comments:
The following changes provide updated information to Table 3-4.
Prime Mod #n
Prime Mod #1, 2, 3, 4 Priority
Prime Mod #5, 6 Priority
Prime Mod #7, 8 Priority Low Prime #5, 6, 7, 8 Multiplexer No
Prime Mod #1 through 7 Delay None D&I #1, 2, 3, 4 Unbalanced
Prime Mod # 8 Delay
Prime Demod #n
Prime Demod #1, 2, 3, 4 Priority
Prime Demod #5, 6 Priority
Prime Demod #7, 8 Priority Low Insert Data Input #5, 6, 7, 8
Prime Demod # 1 through 5 Delay None
Prime Mod #n
Prime Demod #n
Prime Mod #1, 2, 3, 4 Priority
Prime Mod #5, 6 Priority
Prime Mod #7, 8 Priority Low Insert Data Input #1, 2, 3, 4 Normal
Prime Mod #1 through 5 Delay None D&I #5, 6, 7, 8
Prime Mod #6, 7 Delay
Prime Mod # 8 Delay
Operation Mode
Time Current Parity Even
Date Current Remote Type EIA-485 (2Remote Baud Rate 9600 bit/s Mode Control Baud Rate 9600 bit/s
Errata B
Changes to Table 3-4 (Initial Defaults)
October 5, 2001
SMS-7000 Modem protection Switch Installation and Operation
Manual, Rev. 3, dated September 30, 1999
MN/SMS7000.EB3
Attach this page to page 3-33
Table 3-4. Initial Defaults
Configuration Backup #n (n = 1 or 2)
Off
Off
Configuration Independent Prime #n (n = 1 through 8)
Off
Low
Low
None
Off
Low
Low
Configuration Dependent Prime #n (n = 1 through 8)
Off
Off
Low
Low
None
None
Configuration Operation Mode
Manual
Utility System
Backup #1 Multiplexer
Backup #2 Mulitiplexer No
Prime Demod #6, 7 Delay
Prime Demod #8 Delay
Prime #1, 2, 3, 4 Multiplexer
The following documents are referenced in this manual:
• Department of Defense (DOD) MIL-STD-188-114A, “Electrical Characteristics of Digital
Interface Circuits”
• M-2000 Multiplexer Installation and Operation Manual
• Comtech EF Data CRS-280L 1:N Redundancy Switch Installation and Operation Manual
Changes to Related Documents
October 13, 2003
SMS-7000 Modem protection Switch Installation and Operation
Manual, Rev. 3, dated September 30, 1999
MN/SMS7000.EC3
Attach this page to page viii
or, E-Mail can be sent to the Customer Support Department at:
service@comtechefdata.com
Contact us via the web at www.comtechefdata.com
1. To return a Comtech EFData product (in-warranty and out-of-warranty) for
repair or replacement:
2. Request a Return Material Authorization (RMA) number from the Comtech
EFData Customer Support Department.
3. Be prepared to supply the Customer Support representative with the model
number, serial number, and a description of the problem.
4. To ensure that the product is not damaged during shipping, pack the product in
its original shipping carton/packaging.
5. Ship the product back to Comtech EFData. (Shipping charges should be prepaid.)
For more information regarding the warranty policies, see Warranty Policy, p. xii.
.
ii Rev. 3
Table of Contents
Customer Support ...................................................................................................................................................... ii
Overview of Changes to Previous Edition ............................................................................................................. viii
Overview of Changes to Previous Edition ............................................................................................................. viii
About this Manual................................................................................................................................................... viii
Warranty Policy........................................................................................................................................................ xii
1.2.1Switch Controller Unit (SCU)..................................................................................................................1–8
1.2.2Data Switch Unit (DSU) ..........................................................................................................................1–9
1.2.3IF Switch Unit (IFU)..............................................................................................................................1–11
2.2.2Back Mount (Hinged) Hardware Kit........................................................................................................2–3
2.2.3Top Mount Hardware Kit.........................................................................................................................2–4
2.3.1.2Back Mount .....................................................................................................................................2–7
3.2 Front Panel..................................................................................................................................................3–2
3.3 Menu System...............................................................................................................................................3–5
3.4 Front Panel Menu.......................................................................................................................................3–7
3.4.1Configuration Backup 1 and 2 Menu.......................................................................................................3–9
3.4.2Configuration Independent Prime 1 through 8 Menu.............................................................................3–11
iv Rev. 3
SMS-7000 Modem Protection Switch Preface
3.4.3Configuration Dependent Prime 1 through 8 Menu...............................................................................3–15
3.4.4Configuration Load/Verify Menu ..........................................................................................................3–17
3.4.9Stored Faults/Alarms Menu ...................................................................................................................3–27
3.4.10Utility System Menu..........................................................................................................................3–29
3.5 Setup and Configuration..........................................................................................................................3–30
4.1.2Terrestrial Data ........................................................................................................................................4–3
APPENDIX A.REMOTE CONTROL OPERATION............................................................................. A–1
A.1
General .......................................................................................................................................................A–1
A.2.3End Character .....................................................................................................................................A–5
A.6 About Switch............................................................................................................................................A–21
APPENDIX B. M-2000 MULTIPLEXER UTILIZATION ...................................................................... B–1
Figure 2-1. Top mount installation...........................................................................................................................2–9
Figure 2-2. Back mount (hinge) installation...........................................................................................................2–11
Figure 2-3. Hinge mount, side view .......................................................................................................................2–12
Figure 2-4. Hinge mount, top view.........................................................................................................................2–12
Figure 2-7. DSU/IFU terrestrial side ......................................................................................................................2–26
Figure 3-1. SMS-7000 front panel view...................................................................................................................3–1
Figure 3-2. Main menu.............................................................................................................................................3–7
Figure 3-3. Configuration backup 1 and 2 menu ......................................................................................................3–8
Figure 3-4. Configuration independent prime 1 through 8 menu ...........................................................................3–10
Figure 3-5. Configuration dependent prime 1 through 8 menu ..............................................................................3–14
Figure 3-7. Configuration operation mode menu ...................................................................................................3–18
Figure 3-8. System status switching menu .............................................................................................................3–20
Figure 3-9. System status configuration menu .......................................................................................................3–22
Figure 3-10. Faults/alarms menu ............................................................................................................................3–24
Figure 3-12. Utility system menu ...........................................................................................................................3–28
Figure 4-1. IF switch block diagram.........................................................................................................................4–2
Figure B-1. Terrestrial data interconnections ...........................................................................................................b–2
Table 1-2. Data formats ............................................................................................................................................1–4
Table 2-7. Prime mod online connector (J6) ..........................................................................................................2–24
Table 2-8. Prime demod online connector (J5).......................................................................................................2–25
Table 2-9. EIA-422 terrestrial data connectors (J6)................................................................................................2–27
Table 2-10. V.35/EIA-232 terrestrial data connectors (J1).....................................................................................2–29
Table 2-11. Engineering service channel data connectors (J4)...............................................................................2–30
Table 2-13. ADPCM audio data (J5) connectors....................................................................................................2–32
Table 2-14. Balanced G.703/drop & insert data connectors (J3)............................................................................2–33
Table 2-15. Unbalanced data connectors................................................................................................................2–34
Table 2-16. IFU uplink/IF downlink data connectors.............................................................................................2–35
Table 3-1. LED indicators ........................................................................................................................................3–3
Table 3-2. Front panel keypad..................................................................................................................................3–4
Table B-1. SMS-7000/M-2000 50-pin to 37-pin interface cable pinouts .................................................................b–3
Rev. 3 vii
Preface SMS-7000 Modem Protection Switch
Overview of Changes to Previous Edition
This revision supersedes part number MN/SMS7000 Rev. 2 dated October 3, 1997.
A summary of the changes made for Rev. 2 includes:
Chapter 1 Updated Compatibility and Data Formats paragraph and specified that
the SDM-300 modem must be the 50-pin configuration.
Added Options paragraph.
Revised Figure 1-2 to include cable part numbers.
Updated specifications paragraph to the current specification.
Relocated mounting information to Chapter 2.
Chapter 2 Added Equipment Inspection paragraphs to reflect mounting kits and
required tooling.
Added cable information.
Revised mounting instructions by including description and installation
information.
Added trouble shooting information for installation procedures.
Chapter 3 Updated software menu from version 2.1.7 to 2.1.8.
Added revision emulation and initial default paragraphs.
Appendix A Updated to software version 2.1.8.
General Deleted Mounting appendix.
Reidentified Multiplexer section as Appendix B.
About this Manual
This manual provides installation and operation information for the Comtech EFData
SMS-7000 Modem Protection Switch. This is a technical document intended for earth
station engineers, technicians, and operators responsible for the operation and
maintenance of the SMS-7000.
Related Documents
The following documents are referenced in this manual:
• Department of Defense (DOD) MIL-STD-188-114A, “Electrical Characteristics
of Digital Interface Circuits”
• M-2000 Multiplexer Installation and Operation Manual
viii Rev. 3
SMS-7000 Modem Protection Switch Preface
Conventions and References
Cautions and Warnings
CAUTION indicates a hazardous situation that, if not avoided, may result in
minor or moderate injury. CAUTION may also be used to indicate other
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.
WARN ING
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.
Military Standards
References to “MIL-STD-188” apply to the 114A series (i.e., MIL-STD-188-114A),
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. For more information, refer to the Department of Defense
(DOD) MIL-STD-188-114A, “Electrical Characteristics of Digital Interface Circuits.”
Trademarks
Other product names mentioned in this manual may be trademarks or registered
trademarks of their respective companies and are hereby acknowledged.
Rev. 3 ix
Preface SMS-7000 Modem Protection Switch
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 EFData Customer Support
Department.
EMC Compliance
EN55022 Compliance
This equipment meets EN55022.
This is a Class A product. In a domestic environment it may cause radio interference in
which the user may be required to take adequate measures.
Federal Communications Commission (FCC)
Note: All cables shall be shielded.
This equipment has been tested and found to comply with the limits for a Class A digital
device, pursuant to Part 15 of the FCC rules. These limits are designed to provide
reasonable protection against harmful interference when the equipment is operated in a
commercial environment.
This equipment generates, uses, and can radiate radio frequency energy and, if not
installed and used in accordance with the instruction manual, may cause harmful
interference to radio communications. Operation of this equipment in a residential area is
likely to cause harmful interference in which case the user will be required to correct the
interference at his own expense.
x Rev. 3
SMS-7000 Modem Protection Switch Preface
Low Voltage Directive (LVD)
The following information is applicable for the European Low Voltage Directive
(EN60950):
<HAR>
Type of power cord required for use in the European Community.
CAUTION: Double-pole/Neutral Fusing.
!
International Symbols:
Symbol Definition Symbol Definition
ACHTUNG: Zweipolige bzw. Neutralleiter-Sicherung.
Alternating Current.
Protective Earth
Fuse.
Chassis Ground.
Notes:
1. For additional symbols, refer to “Cautions” listed earlier in this preface.
2. Applicable testing is routinely performed as a condition of manufacturing on all
units to ensure compliance with requirements of EN60950 for Safety.
Rev. 3 xi
Preface SMS-7000 Modem Protection Switch
Warranty Policy
This Comtech EFData product is warranted against defects in material and workmanship
for a period of one year from the date of shipment. During the warranty period, Comtech
EFData will, at its option, repair or replace products that prove to be defective.
For equipment under warranty, the customer is responsible for freight to Comtech
EFData and all related custom, taxes, tariffs, insurance, etc. Comtech EFData is
responsible for the freight charges only for return of the equipment from the factory to
the customer. Comtech EFData will return the equipment by the same method (i.e., Air,
Express, Surface) as the equipment was sent to Comtech EFData.
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 EFData.
No other warranty is expressed or implied. Comtech EFData 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
EFData 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 EFData 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 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 notify any person of such changes.
If you have any questions regarding your equipment or the information in this manual,
please contact the Comtech EFData Customer Support Department.
xii Rev. 3
Chapter 1.
INTRODUCTION
1
This chapter provides an overview, description, and specifications for the SMS-7000
satellite modem protection switch. The SMS-7000 is hereinafter referred to in this
manual as “the switch”, and includes the following components (refer to Figure 1-1):
•
IFU Intermediate Frequency Switch Unit
•
DSU Data Switch Unit
•
SCU Switch Control Unit
Figure 1-1. SMS-7000
Rev. 3 1–1
IntroductionSMS-7000 Modem Protection Switch
1.1 Overview
The switch is specifically designed to perform automatic redundancy switching for any
combination of up to two backup and eight prime Comtech EFData satellite modems. Up
to eight separate uplinks and downlinks can be accessed by the user at any time.
Each switch channel has a built-in breakout panel that is automatically configured to
support overhead, non-overhead, and programmable data-type modems. Configuration
and control of the switch and attached modems may be performed from a terminal or PC
connected to the switch remote port (refer to Appendix A); or directly from the switch
front panel (refer to Chapter 3).
The switch is compatible with the M-2000 multiplexer (refer to Appendix C for more
information).
The switch is tested and certified to CE-Mark requirements.
1.1.1 Compatibility
The switch is designed to operate with the following Comtech EFData modems:
•
SDM-100• SDM-300A (see Note)
•
SDM-308-4• SDM-6000
•
SDM-308-5• SDM-8000
•
SDM-309B• SLM-3650 (see Note)
•
SDM-650B• SLM-6650
•
SDM-300 (see Note)• SLM-8650
Note:
Use the 50-pin D connector configuration with the switch.
SDM-308-5
SDM-300/-300A
SDM-309
SDM-300/-300A
SDM-650B
SDM-300/-300A
SDM-6000
SDM-300/-300A
SLM-3650NoneOnly compatible with SLM-3650, incorporating the 50-pin Data
SLM-6650NoneOnly compatible with SLM-6650.
SLM-8650NoneOnly compatible with SLM-8650.
EitherSDM-6000 must be configured as Modem Type 1 to be compatible
with SDM-308-4 (M1200P).
Note:
SDM-6000 must be configured as Modem Type 4 to be
compatible with SDM-308-4 (old IDR interface).(See Note 1)
EitherSDM-6000 must be configured as Modem Type 3 to be compatible
with SDM-308-5.(See Note 1)
EitherSDM-6000 must be configured as Modem Type 2 to be compatible
with SDM-309 (M1200P).(See Note 1)
EitherSDM-8000 must be configured as Modem Type 1 to be compatible
with SDM-308-4.(M1200P).
Note:
SDM-8000 must be configured as Modem Type 4 to be
compatible with SDM-308-4 (old IDR interface) or Type 5 to be
compatible with SDM-308-4 (M1200/RS).(See Note 1)
EitherSDM-8000 must be configured as Modem Type 3 to be compatible
with SDM-308-5.(See Note 1)
EitherSDM-8000 must be configured as Modem Type 2 to be compatible
with SDM-309 (M1200P).(See Note 1)
EitherSDM-100A must have sequential decoder option, and be configured
as Modem Type 1 to be compatible with SDM-650B.(See Note 1)
EitherSDM-300/300A, incorporating the 50-pin Data Interface connector
must be configured to emulate an SDM-100A (Ver: 15.7.1).
EitherSDM-300/300A, incorporating the 50-pin Data Interface connector
must be configured to emulate an SDM-308-4 (Ver: 4.03, 6.05, or
7.03).
EitherSDM-300/300A, incorporating the 50-pin Data Interface connector
must be configured to emulate an SDM-308-5 (Ver: 6.08).
EitherSDM-300/300A, incorporating the 50-pin Data Interface connector
must be configured to emulate an SDM-309 (Ver: 6.04).
EitherSDM-300/300A, incorporating the 50-pin Data Interface connector
must be configured to emulate an SDM-650B (Ver; 4.12A or 4.16)
EitherSDM-300/300A, incorporating the 50-pin Data Interface connector
must be configured to emulate an SDM-6000 (Ver: 5.1.1)
Interface connector.
Notes
:
1.Modem control feature supported by latest code release for SDM-100, SDM-6000, and
SDM-8000.
2. Backup modems are always compatible with primes of like models when they are
comparably equipped.
3. Consult Comtech EFData Customer Support for combinations not shown in Table 1-1.
4. Compatibility differences between modems exist due to the fact that the specific
capabilities of modems vary. For example, the SDM-8000 has a larger set of framing
structure parameters than the SDM-300, etc.
Rev. 3 1–3
IntroductionSMS-7000 Modem Protection Switch
1.1.2 Data Formats
Table 1-2 lists the data formats that the switch will support.
Table 1-2. Data Formats
Data TypeConnector
V.35 Data25-pin D
EIA-422/MIL-STD-188 Data IDR 8K Data Channel37-pin D
G.703 Balanced15-pin D
G.703 UnbalancedCoax BNC
EIA-232 Data25-pin D
ADPCM Audio Data or 64K Data Overhead9-pin D
Engineering Data Channel ASYNC Overhead25-pin D
Alarms25-pin D
Under the following conditions, the switch is designed to operate with prime modems
configured with different overhead data types, such as, IDR, IBS, D&I, ASYNC, or
NONE; and/or with different terrestrial data types, such as, EIA-422, V.35, or G.703:
•
Modems must be one of the following models:
!
SDM-6000
!
SDM-8000
!
SLM-6650
!
SLM-8650
•
Backup modems must have an AS/2876 interface relay board option installed, in
order for the backup modem to switch between IDR, IBS, and Custom mode.
•
Backup modems’ switching mode must be dependent when there is a mixture of
prime modem types. Example: Prime 1 is IDR, and Prime 2 is IBS, EIA-422.
Backup modems must be comparably equipped to the prime modems assigned.
(Example: Backup #1 is an SDM-8000 configured with a relay card and a sequential
decoder. It can backup prime modems (SDM-8000) that are configured as prime #1 IDR
and prime #2 configured for Custom sequential. Backup # 2 can also be an SDM-300
backing up a set of prime SDM-300 modems. The backup modems can be directed to a
specific set of modems.)
1–4Rev. 3
SMS-7000 Modem Protection SwitchIntroduction
1.1.3 Options
Table 1-3 lists the options that are applicable to the switch.
Refer to Table 1-4 for part numbers of various switch component.
Table 1-4. Protection Switch
Part NumberDescription
PL/4800Chassis Controller
PL/4801-1
PL/4801-2
PL/4802Switch, Data
PL/4803Power Supply, AC
PL/4831Power Supply, DC
CA/5343Cable Assembly, 15-Pin, EMI
CA/5361-1Cable Assembly, Switch to Controller, 6 ft. (182.88 cm)
1.2 Description
The switch (Figure 1-1) is composed of three units:
Switch Control Unit (SCU)
•
and configuration.
Data Switch Unit (DSU)
•
data configuration and backup modem data switching.
IF Switch (IFU)
•
switching.
IF Switch, 75
IF Switch, 50
Ω
Ω
— User interface for switch and modem control
— As commanded by the SCU, performs terrestrial
— As commanded by the SCU, performs backup modem IF
This 3-chassis arrangement gives the user control of the switch from the one unit (1U)
rack mounted SCU front panel. The DSU and IFU, which contain all terrestrial and link
interfaces, are mounted inside the rack to minimize rack and external interface cabling.
These units will accommodate the particulars of external interface requirements. They
can be separated or joined together and mounted either in the rear or on the top of the
rack.
1–6Rev. 3
SMS-7000 Modem Protection SwitchIntroduction
The switch functional block diagram (Figure 1-2) displays the functional partitioning and
interconnection between the three chassis.
Two cables interconnect the three units. The SCU and DSU are connected via a cable
that transfers power, faults, and switch control between the two chassis. Power, modem
faults, and switch faults originate from the DSU, while switch control commands are
initiated by the SCU. The IFU is connected to the DSU in the same manner.
CONTROL UNIT
REMOTE CONTROL
EIA-485/232
UP/DOWN LINK
16 COAX
IF SWITC H U NIT
COAX
SWITCH
SLAVE
CONTROLLER
FRONT PANEL
CONTROLLER
CA/5361
FAULT AND
STATUS RELAYS
DB9
SWITCH FAULTS
x2 DB2 5
ONLINE STATUS
DB9 EIA-485
MODEM REMOTE
16 COAX
PRIMARY MODEM IF
RX/TX
4 COAX
BACKUP MODEM IF
RX/TX
TERRESTRIAL
DATA, x8
PRIME POWER IN
PRIME POWER IN
BALANCED DATA
DB25
EIA-422
DB15
G.703
V.3 5
DB25
EIA-232-C
DB25
UNBALANCED DATA 5 COAX
D&I
G.703
EXTERNAL CLOCK
AUXILIARY DATA
ADPCM
DB9
ESC
DB25
ALARMS
DB25
CA/0755
LOW VOLTAGE
POWER
LOW VO LTAGE
POWER
BOP
x8
DATA SWITCH UNIT
Figure 1-2. Block Diagram
IBS/IDR
EIA-485
FAULTS
SLAVE
CONTROLLER
DATA SWITCH
M:N x8
x8 DB5 0
PRIMARY MODEM DATA
RX/TX
x2 DB5 0
BACKUP MODEM DATA
RX/TX
Rev. 3 1–7
IntroductionSMS-7000 Modem Protection Switch
1.2.1 Switch Controller Unit (SCU)
The SCU is a one unit (1U), 19-inch (48.26 cm) rack-mounted chassis that provides the
configuration and automatic switching control functions. Rear panel connectors on this
chassis provide all user remote control and status interfaces and rack internal control
interfaces. The front panel provides local control of the switch.
The SCU front panel (Figure 1-3) provides the user with visual fault and status
indicators. The back-lit display and keypad provide the local user control interface. The
front panel is a typical Comtech EFData modem front panel status and control interface.
The switch front panel supports all functions of the remote port. The user may configure
both the switch and associated modems as well as query status and faults.
Note:
The modem control feature is only available with certain modems. Refer to the
compatibility chart (Table 1-3) for specific applications.
Figure 1-3. SCU Front Panel
The SCU rear panel (Figure 1-4) accommodates the user serial command interface for
remote configuration and status. These interfaces are also shown in the block diagram
(Figure 1-2).
PRIME MOD
J6J6
STATUS
PRIME MOD
STATUS
DATA SWITCH
INTER FACE
J4
J3
SWITCH
FAULTS
MODEM
J2J1
REMOTE
USER
REMOTE
Figure 1-4. SCU Rear Panel
Prime modulator and demodulator status and switch faults are provided on dedicated I/O
connectors. Status and fault conditions are indicated at these connectors by opening and
closing relay contacts, which may be used to directly trigger external alarms and
indicators. The modem remote port is the control interface to all modems attached to the
switch. The Data Switch Interface, which carries control and fault information between
the switch chassis and SCU, is also provided.
1–8Rev. 3
SMS-7000 Modem Protection SwitchIntroduction
1.2.2 Data Switch Unit (DSU)
The DSU performs terrestrial data switch and breakout panel functions. Enclosed in a
shallow 4.5-inch (11.4 cm) deep chassis, the DSU is designed to mount within the rack in
several ways. This will accommodate particular rack configurations and user terrestrial
cable routing.
The DSU (Figure 1-5) may be equipped with up to eight data switch modules—one per
prime modem as required. The modules may be removed and replaced on site, or they
can be added later for configuration expansion. In addition to performing prime and
backup data switch functions, each module incorporates a configurable breakout panel
that steers the desired terrestrial data interfaces to a single modem I/O data connector.
VR
.S
32
53
2
VR
.S
32
53
2
VR
.S
32
53
2
VR
.S
32
53
2
VR
.S
32
53
2
VR
.S
32
53
Figure 1-5. DSU/IFU Terrestrial Side
VR
.S
32
53
2
2
VR
.S
32
53
2
Rev. 3 1–9
IntroductionSMS-7000 Modem Protection Switch
The bottom of the DSU encloses two redundant, online-replaceable, low-voltage, power
supply modules. The power supply modules service all three chassis and are individually
replaceable with no interruption of service.
All terrestrial data connections are located on the data switch module face of the DSU
(Figure 1-5). The breakout panel on the face of each data switch module supports a
variety of standard data and alarm interfaces. These interfaces support IBS, IDR, D&I, or
custom formats.
Ten modem data cable interfaces are located on the opposite face of the DSU (Figure
1-6); one for each of the eight prime and two backup satellite modems. Connectors J11
and J12 provide the interfaces for the SCU and IFU. The line cord receptacles for the
redundant power supply modules are located at the upper corners of the unit The springloaded mechanical slide, associated with each supply, must be slid aside to insert the AC
line cord. Unless the power cord is disconnected, this slide performs two functions
retaining the power cord and preventing the removal of the module.
Figure 1-6. DSU/IFU Modem Side
1–10Rev. 3
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