This manual provides installation and operation information for the Comtech EF Data
CRS-400 1:8 Redundancy Switch. This is a technical document intended for earth station
engineers, technicians, and operators responsible for the operation and maintenance of
the CRS-400 1:8 Redundancy Switch.
ELATED DOCUMENTS
R
Comtech EF Data SDM-2020 Satellite Modulator Installation and Operation Manual
Comtech EF Data SDM-2020 Satellite Demodulator Installation and Operation Manual
ONVENTIONS AND REFERENCES
C
AUTION S AND WARNINGS
C
Indicates information critical for proper equipment function.
IMPORTANT
Indicates a hazardous situation that, if not avoided, may result in minor or moderate
injury. CAUTION may also be used to indicate other unsafe practices or risks of
CAUTION
WARNING
ETRIC CONVERSION
M
property damage.
Indicates a potentially hazardous situation that, if not avoided, could result in
death or serious injury.
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Recommended Standard (RS) Designations have been superseded by the new designation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.
RADEMARKS
T
All product names mentioned in this manual may be trademarks or registered trademarks
of their respective companies and are hereby acknowledged.
EPORTING COMMENTS OR SUGGESTIONS CONCERNING THIS MANUAL
R
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.
This is a Class A product. In a domestic environment, it may cause radio interference that
requires the user to take adequate protection measures.
OMPLIANCE
This equipment meets the radio disturbance characteristic specifications for information
technology equipment as defined in EN55022.
OMPLIANCE
This equipment meets the electromagnetic compatibility/generic immunity standard as
defined in EN50082-1.
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.
(FCC)
This equipment generates, uses, and can radiate radio frequency energy. If not installed
and used in accordance with the instruction manual, it may cause harmful interference to
radio communications. Operation of this equipment in a residential area is likely to cause
harmful interference; in which case, users are required to correct the interference at their
own expense.
To ensure compliance, properly shielded cables for DATA I/O shall be used. More
Note:
specifically, these cables shall be shielded from end to end, ensuring a continuous shield.
This Comtech EF Data product is warranted against defects in material and workmanship
for a period of two years 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.
IMITATIONS OF WARRANTY
L
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.
XCLUSIVE REMEDIES
E
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.
ISCLAIMER
D
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 the equipment or the information in this manual,
please contact the Comtech EF Data Customer Support Department.
xii
Chapter 1. Introduction
CRS-400
1:8 Redundancy
Switch
Optional CRS-280
IF Switch
1.1 D
ESCRIPTION
The Comtech EF Data CRS-400 1:8 Redundancy Switch is designed for use with the
Comtech EF Data SDM-2020 modulator and demodulator to provide fully automatic
protection of traffic circuits in case of equipment failure. It is intended for hub and other
redundancy applications and currently supports the HSSI interface type.
Connection to the traffic modulators/demodulators and the redundant
modulator/demodulator is simple – a Data cable, which carries all data signals and alarm
information, a 485 cable for remote control interfaces, and, in some cases, a fault cable.
This simplifies rack cabling, and reduces the number of potential failure points.
CAUTION
The Comtech EF Data CRS-400 switch is designed specifically as an accessory
product for the Comtech EF Data SDM-2020 modulator and demodulator and is
not designed to operate with any other manufacturer’s equipment.
The CRS-400 is fully modular in construction. All replaceable modules insert into slots in
the rear. This includes the Controller, Power Supply Units (PSU), Traffic Modem
Interface (TMI) and the Redundant Modem Interface (RMI). Power consumption is
below 25 W for a fully populated switch, so no fan cooling is required.
The CRS-400 incorporates the following key reliability features:
Twin, independent, AC power supplies
Maintains normal traffic paths, error free, when AC power is removed
: Redundant Modulator/Demodulator traffic returns to normal traffic path if power is lost
Figure 1-1 CRS-400 Block Diagram with Modems and CRS-280 IF Switch
The function of the CRS-400 Redundancy Switch is depicted in Figure 1-1. User data enters and exits the switch at the left hand side of the diagram, while IF leaves and enters
from the right. The data and clock signals to and from a traffic modulator/demodulator
are routed through a TMI, via a set of relays. There are up to 8 TMIs in the switch,
labeled 1 through 8 in the figure. The relays in the TMI are arranged so that the
unpowered state connects the data signals directly through to the traffic
modulator/demodulator. If the power supplies to the system are lost, or if a TMI carrying
traffic is removed, traffic is not interrupted. In normal circumstances, when the redundant
modulator/demodulator is not in service, no data is carried through the CRS-400
backplane – all data is routed through the TMI.
There are several other key operational features of the CRS-400 architecture:
“Bridging” a traffic modulator/demodulator clock and data: A copy of the data and
clock signals feeding a particular modulator/demodulator is selectively routed to the
redundant modulator/demodulator.
“Bridging” a traffic modulator/demodulator IF: RMI Rx IF is tuned to receive any
selected carrier.
Live traffic may be checked on the redundant demodulator when the traffic
demodulator is placed in “bridge” mode.
There are two ways to set up the CRS-400 for IF operation. The first method does not
require an optional IF switch and is used when all modulators/demodulators within a
group are connected to the same up/down converter.
The second method is used when operation with more than one up/down converter is
required. In this case, adding the CRS-280 IF Switch permits connections to as many
converters as traffic modulators/demodulators.
The data switch and IF switch are shown in Figure 1-2 and Figure 1-3, respectively. Data
enters the TMI modules (CH1 - CH8) at the bottom of Figure 1-2. The Tx data entering
each channel is routed through the TMI and sent out to the traffic modulators/demodulators. The Tx data and clock are also buffered by an amplifier to make them
available for bridging and routing through the RMI.
Figure 1-2 CRS-400 Data Switch Block Diagram (TMI #1 is Bridged)
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g
Introduction MN/CRS400.IOM
Figure 1-3 depicts the separate Tx and Rx sections of the optional IF switch. Either in the
non-energized state of the relays, or when the switch is not powered, the IF traffic is
routed straight through on the primary units. Traffic enters the Tx section of the switch
from the bottom of the switch and leaves from the top. In the Rx section of the switch,
traffic flows in the opposite direction. There is a loss of 3 dB in the demodulator path
because of the receive splitter.
Figure 1-3 CRS-280 IF Switch Block Diagram (with TMI and RMI Modules)
All of the modulators/demodulators are connected to the CRS-400 via a single, 9-pin,
EIA-485, multi-drop cable and the HSSI cable. The EIA-485 link permits the CRS-400 to
determine and store a modulator/demodulator’s configuration, and to send a chosen
configuration to the redundant modulator/demodulator.
The front panel contains the Vacuum Fluorescent Display (VFD), keypad, and several
LED indicators. Enter data via the keypad, and messages are displayed on the VFD.
Behind the front panel, there is an audio alarm that can be controlled to respond to
various faults.
External cables are attached to connectors on the rear panel of the CRS-400’s plug-in
modules.
The connectors are listed below for reference.
Data connector to each Mod/Demod
User Data Interface connector for each traffic Mod/Demod to the outside world
System Alarms connector
Remote Control connector
Auxiliary EIA-485 connector, (Pass-Through)
Diagrams of the front and back panels are shown in Chapter 2.
Part Number Description Model # Comments Install Option
Main Unit Chassis,
Motherboard and Display
AS/9163 Traffic Modem Interface, HSSI CRS-410 Option User
AS/9165 Redundant Modem Interface, HSSI CRS-412 Option User
AS/0377 System Controller CRS-230
AS/0376 Power Supply: 100–250 VAC CRS-240 With Main Unit User
FP/CV9167 Blank Panel Option User
PL/WR9212-1 485 Multi-drop cable With Main Unit User
AS/8976-2 I/F Switch: 50 Ohm
(Not Available)
AS/8976-1 I/F Switch: 75 Ohm CRS-280-1 Option User
PL/WR9195-6 HSSI – 6 foot cable Option With
Switch
Operating Mode - IF Switch Dependent or Independent
Mod/Demod
Priority/Programmable
Switching Hold Off Time 2 to 99 Seconds
Switching Manual or Auto
Default on Power Loss Redundant Modulator/Demodulator traffic returns to the normal
Operating Modes Fully Automatic
ATA REDUNDANCY AND CONTROLLER
1 to 8
1
Dependent or Independent
1 Bridge Mode
traffic path.
Manual, force backup to replace selected traffic channel
Manual, force backup to parallel traffic channel, Bridge
Remove selected traffic channel from control, Active or Not Active
User interface/Connector
(8 Data/TMI Channels)
Configuration Control Remote:
Tx Offline Activity Bridged unit receives a copy of the clock and data from one of the
HSSI to 70 Mbit/s SCSI-2 female
75 Ohm, Supporting : BNC-Female
EIA-485/232-C, programmable
Both switch and mod/demod communications
Manual:
Menu driven from switch front panel
Both switch and mods/demods
traffic channels. User designates the traffic channel.
Characteristic Requirement
Tx/Rx Operating Frequency 50 to 180 MHz
Return Loss 18 dB return loss into 75Ω (50Ω optional)
Tx to Tx Channel Isolation > 50 dB
Rx to Rx Channel Isolation > 50 dB
Tx to Rx Channel Isolation > 60 dB
Number of Uplinks 1 to 8 traffic mods/demods
Transmit IF Loss < 1.5 dB over operating frequency
Receive IF Loss < 5 dB over operating frequency
Tx / Rx Connectors BNC female
L-Band IF Switch
Number of Downlinks 1 to 8 traffic units
Powering of IF Switch From the CRS-400 chassis for 70 / 140 MHz or L-Band
Dimensions are shown in both inches and (centimeters).
10
Chapter 2. Installation and Initial Setup
Unpacking and Inspection
Front Panel
Rear Panel
Mounting Instructions
Installation Details
Cables and Connectors
TMI Modules
RMI Modules
Connecting the Cables
Configuring the Mods/Demods – Firm ware Vers ions
Applying Power to the Switch
Configuring the Switch
Configuring the IF Carriers
Configuring Automatic Operation Mode
13
13
13
14
15
15
22
24
26
27
28
29
30
32
: The term “modulator/demodulator” will be abbreviated to “mod/demod” throughout the
Note
remainder of this chapter.
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Installation and Setup MN/CRS400.IOM
Figure 2-1 CRS-400 Front Panel
Figure 2-2 CRS-400 Rear Panel, with 8 HSSI TMI and 1 HSSI RMI
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CRS-400 1:8 Redundancy Switch Revision 0
Installation and Setup MN/CRS400.IOM
2.1 U
2.2 F
NPACKING AND INSPECTION
1
Inspect shipping containers for damage.
If shipping containers are damaged, keep them until the contents of the shipment have
been carefully inspected and checked for normal operation.
2
Remove the packing list from the outside of the shipping carton.
3
Open the carton and remove the contents.
4
Check the contents against the packing list to verify completeness of the shipment.
5
If damage is evident, contact the carrier and Comtech EF Data immediately and submit a
damage report.
6
Be sure to keep all shipping materials for the carrier's inspection.
If the unit needs to be returned to Comtech EF Data, please use the original shipping
container.
RONT PANEL
Figure 2-1 is an illustration of the front panel. The CRS-400 is constructed as a 4U high
rack-mounting chassis that can be freestanding, if desired. It is provided with rackhandles at the front for easy removal from and placement into a rack.
2.3 R
EAR PANEL
The connectors on the rear panel (see Figure 2-2) of the CRS-400 include:
Data connectors
Data connector to each Mod/Demod
User Data Interface connector for each traffic Mod/Demod to the outside world
Redundant Modem Interface (RMI) connectors
System Alarms connector
Remote Control connector
Auxiliary (Pass-Through) EIA-485 connector, 19200 baud with 7-E-2 (7 Data bits,
Even parity, and 2 Stop bits protocol only)
IF Switch Control connector
Power Supply connectors
13
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