Comtech EF Data CRS-150 User manual
IMPORTANT NOTE: The information contained in this document supersedes all previously published
information regarding this product. Product specifications are subject to change without prior notice.
Part Number MN/CRS150.IOM Revision 2
CR
S
-
1
5
0
1:1 Redundancy Switch
Installation and Operation Manual
Accessory Product for use only with
Comtech EF Data CDM-600 Modems
(Requires Modem Firmware Version 1.1.0 or Higher)
Copyright © 2011 Comtech EF Data. All rights reserved. Printed in the USA.
Comtech EF Data, 2114 West 7th Street, Tempe, Arizona 85281 USA,480.333.2200, FAX: 480.333.2161
iii
TABLE OF CONTENTS
TABLE OF CONTENTS ..............................................................................................................III
TABLES...................................................................................................................................... VI
FIGURES.................................................................................................................................... VI
PREFACE.................................................................................................................................. VII
About this Manual ....................................................................................................................................vii
Reporting Comments or Suggestions Concerning this Manual..............................................................vii
Related Documents ...................................................................................................................................vii
Conventions and References...................................................................................................................viii
Warnings, Cautions, and Notes .............................................................................................................viii
Metric Conversion .................................................................................................................................viii
Recommended Standard Designations ..................................................................................................viii
Trademarks ............................................................................................................................................viii
Electromagnetic Compatibility (EMC) Compliance...............................................................................ix
EN 55022-1997 Compliance ...................................................................................................................ix
EN 50082-1:1998 Compliance ................................................................................................................ix
Safety Compliance .....................................................................................................................................ix
EN 60950.................................................................................................................................................ix
Electrical Safety.......................................................................................................................................ix
Equipment Connection .............................................................................................................................x
European Low Voltage Directive (LVD) .................................................................................................x
Federal Communications Commission (FCC)..........................................................................................x
Telecommunications Terminal Equipment Directive..............................................................................xi
Environmental .........................................................................................................................................xi
Warranty Policy.........................................................................................................................................xi
Limitations of Warranty ..........................................................................................................................xi
Exclusive Remedies................................................................................................................................xii
Customer Support....................................................................................................................................xiii
Online Customer Support ......................................................................................................................xiii
CHAPTER 1.INTRODUCTION...........................................................................................1–1
1.1Overview.....................................................................................................................................1–1
1.2Description of Features..............................................................................................................1–2
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1.3Functional Description ..............................................................................................................1–4
1.4Summary of Specifications........................................................................................................1–5
1.5Dimensional Envelope ...............................................................................................................1–7
CHAPTER 2.INSTALLATION ............................................................................................2–1
2.1Unpacking and Inspecting the Shipment.................................................................................2–1
2.2Rack-Mounting the CRS-150....................................................................................................2–2
CHAPTER 3.CONNECTOR PINOUTS ..............................................................................3–1
3.1Connector Overview..................................................................................................................3–1
3.2Front Panel Connectors.............................................................................................................3–3
3.2.1Front Panel IF Connectors – Receive IF and Transmit IF, 50ΩBNC..................................... 3–3
3.2.2Front Panel Terrestrial Data Connectors ................................................................................. 3–4
3.2.2.1Overhead Data Connector, DB-25M ..............................................................................3–4
3.2.2.2Data Interface Connector, DB-25F.................................................................................3–5
3.2.2.3Audio Connector, DB-9F................................................................................................ 3–6
3.2.2.4G.703 Connectors ........................................................................................................... 3–6
3.2.2.4.1Balanced G.703 Interface Connector, DB-15F......................................................... 3–6
3.2.2.4.2Rx and Tx (Unbalanced) G.703 Connectors, 75ΩBNC ..........................................3–7
3.2.2.4.3IDI, DDO Connectors, 75ΩBNC............................................................................3–7
3.2.3Front Panel Utility Connectors ................................................................................................ 3–8
3.2.3.1Ext Ref, 50ΩBNC..........................................................................................................3–8
3.2.3.2IDR Alarms Connector, DB-15F ....................................................................................3–8
3.2.4Front Panel Power Connections – Aux DC Inputs ..................................................................3–8
3.3Rear Panel Connectors..............................................................................................................3–9
3.3.1 Rear Panel IF Connectors – Receive IF and Transmit IF A/B, 50ΩBNC...............................3–9
3.3.2Rear Panel Terrestrial Data Connectors ................................................................................3–10
3.3.2.1Balanced G.703 A and B Connectors, DB-15M........................................................... 3–10
3.3.2.2Audio A and B Connectors, DB-9F.............................................................................. 3–11
3.3.2.3Overhead Data A and B Connectors, DB-25M.............................................................3–12
3.3.2.4Data Interface A and B Connectors, DB-25F ............................................................... 3–13
3.3.3Rear Panel Utility Connectors ...............................................................................................3–14
3.3.3.1IDR Alarms A and B Connectors, DB-15F .................................................................. 3–14
3.3.3.2Aux Serial A and B Receptacles, USB Type ‘A’ .........................................................3–14
3.3.3.3Ext Ref A and B Connectors, 50ΩBNC ......................................................................3–15
3.3.4Ground Connection ...............................................................................................................3–15
3.4Data Interface Converter Modules / Adapters......................................................................3–15
3.4.1CIC-20 HSSI Connector, HD-50F.........................................................................................3–16
3.4.2CIC-35 ASI Connectors, 75ΩBNC ......................................................................................3–16
3.4.3E1/T1 RJ-48 Connection via Balanced G.703 Interface Connector......................................3–17
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CHAPTER 4.CABLES AND CONNECTIONS ...................................................................4–1
4.1Overview.....................................................................................................................................4–1
4.2Cabling to the CDM-600 ...........................................................................................................4–2
4.2.1.1CRS-150 Accessories .....................................................................................................4–2
4.2.2Modem-to-Switch Control Interface Connection ....................................................................4–3
4.2.3Modem-to-Switch IF Interface Connection.............................................................................4–4
4.2.4Modem-to-User Utility Interface Connection and Examples..................................................4–5
4.2.4.1IDR Alarms Data Interface Example..............................................................................4–5
4.2.4.2External Reference Data Interface Example...................................................................4–6
4.2.5Modem-to-User Data Interface Connection and Examples.....................................................4–7
4.2.5.1RS-422/232 Interface Example.......................................................................................4–8
4.2.5.2HSSI Data Interface Example.........................................................................................4–9
4.2.5.3G.703 Balanced Interface Example ..............................................................................4–10
4.2.5.4G.703 Unbalanced Interface Example .......................................................................... 4–11
4.2.5.5ASI Data Interface Example .........................................................................................4–12
4.2.5.6E1/T1 Data Interface Example......................................................................................4–13
4.2.5.7Overhead Data Interface Example................................................................................4–14
4.2.5.8Audio Data Interface Example...................................................................................... 4–15
4.3Cabling to the CDM-600L (CLM-9600L)..............................................................................4–16
CHAPTER 5.MODEM AND SWITCH CONFIGURATION .................................................5–1
5.1Overview.....................................................................................................................................5–1
5.2Configuration of CDM-600s for 1:1 Redundancy...................................................................5–2
5.2.1Automatic Redundant Operation ............................................................................................. 5–2
5.2.2Manual Redundant Operation (Forced Switchover)................................................................5–3
5.2.2.1Forced Switchover via the CDM-600 Front Panel..........................................................5–3
5.2.2.2Forced Switchover via Remote Bus................................................................................ 5–3
5.2.3Replacement of Standby Unit..................................................................................................5–3
5.3CRS-150 Switch DIP Settings...................................................................................................5–4
APPENDIX A.CABLE DRAWINGS....................................................................................A-1
A.1Introduction................................................................................................................................A-1
A.2Control Interface Cables...........................................................................................................A-1
A.2.1Modem-to-Switch Auxiliary Serial Cable (1:1 Control), USB Type A ÆUSB Type B ...A-2
A.2.2Modem-to-Switch (CRS-150 ÆCRS-170A) Control/Data ‘Y’ Cable, DB-25M ÆDB-25M,
DB-9M (CDM-600L [CDM-9600L])...................................................................................................A-3
A.3IF / Utility / Data Interface Cables...........................................................................................A-4
A.3.1Modem-to-Switch/User IF (70/140 MHz) Coax Cable, Type ‘BNC’ 50Ω.........................A-5
A.3.2Modem-to-Switch Data Cable, DB-15M ÆDB-15M ........................................................A-6
A.3.3Modem-to-Switch Coax Cable, Type ‘BNC’ 75Ω..............................................................A-7
A.3.4Modem-to-Switch Universal Control/Data Cable, DB-25M ÆDB-25M ..........................A-8
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A.3.5Modem-to-Switch Universal Control/Data Cable, DB-15M ÆDB-15M ..........................A-9
A.3.6Modem-to-Switch Data Cable, DB-25M ÆDB-25M ......................................................A-10
A.3.7Modem-to-Switch Data Cable, DB-9M ÆDB-9M ..........................................................A-11
TABLES
Table 3-1. CRS-150 External Connectors (Front and Rear Panel) ........................................................... 3–2
Table 5-1. CRS-150 DIP Switch Settings................................................................................................. 5–4
FIGURES
Figure 1-1. CRS-150 1:1 Redundancy Switch.......................................................................................... 1–1
Figure 1-2. CRS-150 1:1 Redundancy Switch – Panel Views.................................................................. 1–2
Figure 1-3. CRS-150 Dimensional Envelope ........................................................................................... 1–7
Figure 2-1. Unpacking and Inspecting the Shipment................................................................................ 2–1
Figure 2-1. Typical CDM-600/CRS-150 1:1 Redundancy Installation .................................................... 2–2
Figure 3-1. CRS-150 Connectors.............................................................................................................. 3–1
Figure 3-2. CN-0000268 DB-15M ÆRJ-48F Adapter for E1/T1 Operation......................................... 3–17
Figure 4-1. Modem-to-Switch Control Connection .................................................................................. 4–3
Figure 4-2. Modem-to-Switch IF Connection........................................................................................... 4–4
Figure 4-3. IDR Alarms Interface Example.............................................................................................. 4–5
Figure 4-4. Ext Ref (External Reference) Interface Example................................................................... 4–6
Figure 4-5. CDM-600 Block Diagram: User ÆModem ÆSwitch ÆTraffic ........................................ 4–7
Figure 4-6. RS-422/232 Interface Example .............................................................................................. 4–8
Figure 4-7. HSSI Example........................................................................................................................ 4–9
Figure 4-8. G.703 Balanced Interface Example...................................................................................... 4–10
Figure 4-9. G.703 Unbalanced Interface Example.................................................................................. 4–11
Figure 4-10. ASI Example ...................................................................................................................... 4–12
Figure 4-11. G.703 E1/T1 Interface Example......................................................................................... 4–13
Figure 4-12. Overhead Interface Example.............................................................................................. 4–14
Figure 4-13. Audio Interface Example ................................................................................................... 4–15
Figure 4-14. CDM-600L (CLM-9600L) Block Diagram: Cable Connections ....................................... 4–16
Figure 5-1. CDM-600 Front Panel............................................................................................................ 5–2
Figure 5-2. CRS-150 Front Panel – DIP Switches.................................................................................... 5–4
Figure A-1. Auxiliary Serial Control Cable (CEFD P/N CA/USB-AM/BM-3) ......................................A-2
Figure A-2. Data / Control ‘Y’ Cable (CEFD P/N CA/WR10456-4).......................................................A-3
Figure A-3. Tx/Rx/User Data Type ‘BNC’ 50ΩCoax Cable (CEFD P/N PL/0946-1)............................A-5
Figure A-4. IDR Alarms Interface Cable (CEFD P/N CA/WR9564-4) ...................................................A-6
Figure A-5. External Reference Type ‘BNC’ 75ΩCoax Cable (CEFD P/N PL/0813-4) ........................A-7
Figure A-6. 1:1 Universal Control/Data Cable (CEFD P/N PL/6233) .....................................................A-8
Figure A-7. 1:1 Universal Control/Data Cable (CEFD P/N CA/WR9563-4)...........................................A-9
Figure A-8. Overhead Data Cable (CEFD P/N CA/WR9040-4) ............................................................A-10
Figure A-9. Audio Data Interface Cable (CEFD P/N CA/WR9378-4)..................................................A-11
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PREFACE
About this Manual
This manual provides installation and operation information for the Comtech EF Data CRS-150 1:1
Redundancy Switch, used for 1:1 Redundancy operations with the CDM-600 Satellite Modem.
This is a technical document intended for the persons responsible for the operation and maintenance
of the CRS-150 and CDM-600.
Reporting Comments or Suggestions Concerning this Manual
Comments and suggestions regarding the content and design of this manual are appreciated. To
submit comments, please contact the Comtech EF Data Technical Publications Department:
Related Documents
•Comtech EF Data CDM-600/600L Satellite Modem Installation and Operation Manual
•Comtech EF Data CIC-20 LVDS to HSSI Interface Converter Installation and Operation Manual
•Comtech EF Data CIC-35 LVDS to ASI Interface Converter Installation and Operation Manual
CRS-150 1:1 Redundancy Switch Revision 2
Preface MN/CRS150.IOM
viii
Conventions and References
Warnings, Cautions, and Notes
A WARNING gives information about a possible hazard that MAY CAUSE
DEATH or SERIOUS INJURY.
A CAUTION gives information about a possible hazard that MAY CAUSE
INJURY or PROPERTY DAMAGE.
A NOTE gives important information about a task or the equipment.
A REFERENCE directs the user to additional information about a task or the
equipment.
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 non-metric 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, RS-485, etc.). All other
references in the manual will be shown with the EIA designations (EIA-232, EIA-485, etc.) only.
Trademarks
All product names mentioned in this manual may be trademarks or registered trademarks of their
respective companies and are hereby acknowledged.
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ix
Carefully review the information that follows.
Electromagnetic Compatibility (EMC) Compliance
This is a Class B product. In a domestic environment, it may cause radio interference that requires
the user to take adequate protection measures.
EN 55022-1997 Compliance
This equipment meets the radio disturbance characteristic specifications for information technology
equipment as defined in EN 55022-1997.
EN 50082-1:1998 Compliance
This equipment meets the Electromagnetic Compatibility: Generic Immunity standard as defined
in EN50082-1:1998.
In order that the CRS-150 continues to comply with these standards, observe the following
instructions:
•Connections to the transmit and receive IF ports (BNC 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 unit 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 refitted before normal
operation commences.
Safety Compliance
EN 60950
Applicable testing is routinely performed as a condition of manufacturing on all units to ensure
compliance with safety requirements of safety standard EN 60950 Safety of Information
Technology Equipment including Electrical Business Machines.
This equipment meets the Safety of Information Technology Equipment specification as defined
in EN 60950.
Electrical Safety
The equipment is rated for operation at +12 volts DC and -12 volts DC. It has a maximum power
consumption of 4.5 Watts, and draws a maximum of 250 mA at +12 volts DC and 120 mA at -12
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volts DC. The power supply current is, in all circumstances, supplied by either a single Comtech EF
Data CDM-600 Satellite Modem, or a pair of these modems.
Equipment Connection
The CRS-150 is designed for operation ONLY with the Comtech EF Data CDM-600 Satellite
Modems. These modems supply DC operating current (electronically fused and protected) and
control signals for the correct functioning of this unit. Connection to other manufacturers’
equipment could result in damage to the unit. The CRS-150 is not compatible with other Comtech
EF Data modems not listed in this manual.
European Low Voltage Directive (LVD)
The following information is applicable for the European Low Voltage Directive (2006/95/EC):
Symbol Description
<HAR> Type of power cord required for use in the European Community.
!
CAUTION: Double-pole/Neutral Fusing
ACHTUNG: Zweipolige bzw. Neutralleiter-Sicherung
International Symbols
Symbol Definition Symbol Definition
Alternating Current Protective Earth
Fuse Chassis Ground
For additional symbols, refer to Warnings, Cautions, and Notes listed earlier in
this Preface.
Federal Communications Commission (FCC)
This equipment has been tested and found to comply with the limits for a Class B digital device,
pursuant to Part 15 Subpart B 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. 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 must be used. More
specifically, these cables must be shielded from end to end, ensuring a
continuous shield.
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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.
Environmental
The CRS-150 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; and corrosive or explosive atmospheres.
Warranty Policy
Comtech EF Data products are warranted against defects in material and workmanship for
a specific period from the date of shipment, and this period varies by product. In most
cases, the warranty period is two years. During the warranty period, Comtech EF Data will,
at its option, repair or replace products that prove to be defective. Repairs are warranted for
the remainder of the original warranty or a 90 day extended warranty, whichever is longer.
Contact Comtech EF Data for the warranty period specific to the product purchased.
For equipment under warranty, the owner is responsible for freight to Comtech EF Data
and all related customs, taxes, tariffs, insurance, etc. Comtech EF Data is responsible for
the freight charges only for return of the equipment from the factory to the owner. 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.
All equipment returned for warranty repair must have a valid RMA number issued prior to
return and be marked clearly on the return packaging. Comtech EF Data strongly
recommends all equipment be returned in its original packaging.
Comtech EF Data Corporation’s obligations under this warranty are limited to repair or
replacement of failed parts, and the return shipment to the buyer of the repaired or replaced
parts.
Limitations of Warranty
The warranty does not apply to any part of a product that has been installed, altered,
repaired, or misused in any way that, in the opinion of Comtech EF Data Corporation,
would affect the reliability or detracts from the performance of any part of the product, or is
damaged as the result of use in a way or with equipment that had not been previously
approved by Comtech EF Data Corporation.
The warranty does not apply to any product or parts thereof where the serial number or the
serial number of any of its parts has been altered, defaced, or removed.
The warranty does not cover damage or loss incurred in transportation of the product.
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The warranty does not cover replacement or repair necessitated by loss or damage from any
cause beyond the control of Comtech EF Data Corporation, such as lightning or other
natural and weather related events or wartime environments.
The warranty does not cover any labor involved in the removal and or reinstallation of
warranted equipment or parts on site, or any labor required to diagnose the necessity for
repair or replacement.
The warranty excludes any responsibility by Comtech EF Data Corporation for incidental
or consequential damages arising from the use of the equipment or products, or for any
inability to use them either separate from or in combination with any other equipment or
products.
A fixed charge established for each product will be imposed for all equipment returned for
warranty repair where Comtech EF Data Corporation cannot identify the cause of the
reported failure.
Exclusive Remedies
Comtech EF Data Corporation’s warranty, as stated is in lieu of all other warranties,
expressed, implied, or statutory, including those of merchantability and fitness for a
particular purpose. The buyer shall pass on to any purchaser, lessee, or other user of
Comtech EF Data Corporation’s products, the aforementioned warranty, and shall
indemnify and hold harmless Comtech EF Data Corporation from any claims or liability of
such purchaser, lessee, or user based upon allegations that the buyer, its agents, or
employees have made additional warranties or representations as to product preference or
use.
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.
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Customer Support
Contact the Comtech EF Data Customer Support Department for:
•Product support or training
•Reporting comments or suggestions concerning manuals
•Information on upgrading or returning a product
A Customer Support representative may be reached during normal business hours 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
To return a Comtech EF Data product (in-warranty and out-of-warranty) for repair or
replacement:
•Contact the Comtech EF Data Customer Support Department during normal business
hours. Be prepared to supply the Customer Support representative with the model number,
serial number, and a description of the problem.
•Request a Return Material Authorization (RMA) number from the Comtech EF Data
Customer Support representative.
•Pack the product in its original shipping carton/packaging to ensure that the product is
not damaged during shipping.
•Ship the product back to Comtech EF Data. (Shipping charges should be prepaid.)
Online Customer Support
An RMA number can be requested electronically by accessing Comtech EF Data’s online
Support page (www.comtechefdata.com/support.asp). From this page:
•Click the Service hyperlink, then read the Return Material Authorization section for
detailed instructions on Comtech EF Data’s return procedures.
•Click [Send RMA Request] on the Support page or the RMA Request hyperlink provided
in the Service | Return Material Authorization section; fill out the Billing Information,
Return Information, and Unit to be Returned sections completely, then click [Send email].
– or –
•Send an e-mail providing this same detailed information to the Customer Support
Department at service@comtechefdata.com.
Refer to p. xi in this Preface for information regarding this product’s Warranty Policy.
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Notes:
1–1
Chapter 1. INTRODUCTION
1.1 Overview
Figure 1-1. CRS-150 1:1 Redundancy Switch
The CRS-150 1:1 Redundancy Switch module, shown in Figure 1-1, is a companion product for
use with the CDM-600 Satellite Modem.
Designed to continuously monitor a pair of modems (Units ‘A’ and ‘B’) in a 1:1 redundant
configuration, the CRS-150 automatically switches data and IF signals from the failed online
modem to the standby modem in the event of an equipment failure or undesired traffic condition.
Traffic paths are fully protected, and the system operator can have increased confidence that
equipment failures will not adversely affect system availability.
A 1:1 redundancy system comprises an online modem, a redundant (standby) modem, and the
CRS-150 1:1 Redundancy Switch. Note that the CRS-150 is intended for mounting at the rear of a
pair of modems in a 19” rack system.
The CRS-150 is an accessory product designed specifically for the Comtech EF
Data CDM-600 modem, and must not be used with any other equipment.
For correct operation of the CRS-150, the CDM-600 modems must have
Firmware
Version 1.1.0 (or higher).
If the modems do not meet this requirement, please
contact Comtech EF Data Customer Support to arrange to receive a free Flash
upgrade.
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1.2 Description of Features
Figure 1-2. CRS-150 1:1 Redundancy Switch – Panel Views
Figure 1-2 illustrates the operational features available on the front and rear panels of the
CRS-150 1:1 Redundancy Switch.
The CRS-150 includes, as standard, a universal data interface, which eliminates the need to
exchange interface cards for different applications. Supported interfaces include:
•EIA-422 (EIA530) DCE
•V.35 DCE (at rates up to 10 Mbps)
•Synchronous EIA-232 DCE (at rates up to 300 kbps)
•LVDS (at rates up to 20 Mbps)
•Balanced and Unbalanced G.703 at rates up to E2 (8.448 Mbps)
Because CDM-600 operational details are not covered in this manual, the user should refer to the
Comtech EF Data CDM-600/600L Satellite Modem Installation and Operation Manual as needed to
become familiar with all aspects of the modem before attempting redundant operations.
For Drop and Insert (D&I) applications, the second G.703 port (T1 or E1) found on the rear panel
of the CDM-600 is also provided. The operator does not have to configure the interface type –
control signals from the modems automatically perform the selection.
Clock and data signals in the transmit direction are buffered and fed to both modems in the pair
simultaneously. The Receive IF signal is split and fed to both modems. This means that both
modems see identical Tx and Rx traffic signals all the time, which permits the CRS-150 to
continually compare the fault status of both modems. If the CRS-150 sees an identical fault on
both modems at the same time, it will infer that the fault condition exists in the external system,
and eliminate an unnecessary switchover.
Only one modem in the pair (the online unit) is permitted to transmit its IF carrier signal at any one
instance. For total security, the offline modem mutes its Tx carrier, and the CRS-150 provides
further isolation by using an RF relay within the unit. Unlike some other 1:1 redundancy systems,
which use a passive power combiner for this function (losing approximately 3.5 dB in output power
level), the CRS-150 does not introduce any significant attenuation of output signal level.
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As a companion product for the CDM-600, the CRS-150 provides full protection for all Open
Network overhead signals (IDR Backward Alarms, Overhead Data Channels, Audio, etc.), as
well as external reference signals.
An advantage of the CRS-150 redundancy system is the Auxiliary Serial connection
between the modem pair. With the appropriate cables connecting the modems to the
CRS-150, the online unit interrogates the standby unit, at regular intervals, to determine
its configuration. If a difference in configuration is detected, the online unit automatically
reconfigures the standby unit so that the configurations are always synchronized. If the
standby unit is replaced, it does not have to be reprogrammed to match the online unit; the
process is entirely automatic.
Operators can manually force a switchover from the front panel of the online modem,
or via the remote control bus. Alternatively, operators may choose the conditions that
will cause an automatic switchover. Automatic switchover conditions are controlled by
two switches located on the front panel of the unit – this provides a great deal of
flexibility in switch operation. Switch Mode choices are: Unit Faults only; Unit +
Transmit Traffic Faults; Unit + Receive Traffic Faults; or Unit + Transmit + Receive
Faults.
For operation at the maximum data rate of 20 Mbps, the CDM-600 uses a
serial LVDS interface. However, many applications, including high-speed
routers, use the popular HSSI interface (using negative ECL levels). For
these applications, the Comtech EF Data CIC-20 LVDS to HSSI Interface
Converter module is available.
Also available, for conversion of LVDS to ASI, is the Comtech EF Data
CIC-35 LVDS to ASI Interface Converter module.
Either module typically connects directly to the rear of a standalone
CDM-600. For CDM-600s used in redundancy with a CRS-150, however,
either module plugs into the Overhead / Data Interface connector set on the
front panel of the CRS-150.
Like the CRS-150, the CIC-20 and CIC-35 take their operating power
directly from the modem. However, the CDM-600 modem can safely
supply enough current for only one attached device, not two. Therefore,
when connecting a CIC-20 or CIC-35 to the CRS-150, also connect an
external supply (or supplies) to the CRS-150. This low-current DC supply,
located on the front panel, provides DC voltage between 11 and 15 volts.
While a single supply may be used, for maximum reliability a second
diode-shared input is provided and use of both ‘A’ and ‘B’ supplies is
recommended.
The CIC-20 or CIC-35 module, when either is used, plugs directly into the
CRS-150 front panel – do NOT use a cable for either module.
CRS-150 1:1 Redundancy Switch Revision 2
Introduction MN/CRS150.IOM
1–4
1.3 Functional Description
The CRS-150 connects to two modems – the online modem (identified for the purpose of this
example as Unit ‘A’), and the redundant (standby) modem (Unit ‘B’). The CRS-150 monitors the
fault status and controls the routing of data and IF signals to and from these two modems. In the
case of an equipment failure, switching automatically takes place to protect the traffic circuit.
At the heart of the CRS-150 is a Controller State Machine. Implemented in a complex
programmable logic device (CPLD), it is responsible for fault monitoring and control of switching
functions.
The CRS-150 derives its operating power from the Unit ‘A’ and Unit ‘B’ modems. A diode-
sharing arrangement with a current-sharing circuit ensures that, in normal operation, power is
taken equally from the two modems. However, in the event that one of the two units is removed,
the remaining modem can supply all of the current requirement.
The modems supply +12 volts DC (at a combined total of 250 mA max) and -12 volts DC (at a
combined total of 120 mA max). Maximum power consumption occurs in a serial LVDS mode at
maximum data rate (20 Mbps). Power consumption in EIA-232 modes is approximately 40% of
the maximum values. The modem employs electronic fuses, which prevent excessive current
from being drawn by the CRS-150, should an anomalous condition occur.
Transmit Clock and Data signals entering the unit via the Data Interface are buffered and fed to
both units simultaneously. This ensures that the standby unit sees the same traffic conditions as
the online unit. Receive Data and Clock signals coming from the online modem are routed, using
signal relays, to the Data Interface. In the event that a switchover occurs, these relays switch so
the standby unit then supplies the Data and Clock signals.
As only one modem in the pair (the online unit) is permitted to transmit its IF carrier signal at any
one instant, the standby unit is forced to disable its TX carrier by asserting the TX Carrier Off
signal at the Data Interface. In addition, the CRS-150 provides further isolation (and security) by
using an RF relay within the unit. Unlike some other 1:1 redundancy systems that use a passive
power combiner on the two Tx IF ports (and hence lose approximately 3.5 dB in output power
level) the CRS-150 does not introduce any significant attenuation of output signal level.
The Receive IF signal is fed to both units simultaneously using an internal power divider. This
does introduce a loss of approximately 3.5 dB but, given the wide dynamic range of the
demodulator in the CDM-600, this is not considered to be a problem. The advantage of this
scheme is that the demodulators in both the online and standby units are locked; therefore, if a
switchover does occur there will be no delay while waiting for the demodulator to acquire lock –
this greatly speeds the time for the switchover to occur.
Fault status information is fed from each of the two modems via the Data Interface connector.
The Controller State Machine decides, based on the fault status, which of the two modems – Unit
‘A’ or Unit ‘B’ – is to be the online modem. It will assert a control signal to the standby modem,
which mutes its Tx IF carrier, and simultaneously indicates to the microcontroller within the
standby unit that the modem is no longer online. This results in the “ON LINE” LED on the now-
offline modem’s front panel being extinguished. This status is also reported over the remote
control bus, so an external M&C system can determine the state of the redundancy system. At the
CRS-150 1:1 Redundancy Switch Revision 2
Introduction MN/CRS150.IOM
1–5
same time, the “On-Line” LED – i.e., the green Unit ‘A’ LED or the yellow Unit ‘B’ LED – will
illuminate on the CRS-150 front panel to indicate which modem is online.
1.4 Summary of Specifications
Equipment Type 1:1 Redundancy Switch
Modems Supported Comtech EF Data CDM-600 Digital Satellite Modem
Operating Modes •Fully Automatic
•Manual (via the front panel of the Online Modem, or via the Modem’s remote control
interface)
Architecture •Full bridging architecture, with configuration synchronization
•Tx Clock and Data signals fed to both Online and Standby units
•Rx IF signal fed to both Online and Standby units
•Continuous fault comparison of Online and Standby units (The configuration of Online
and Standby units is synchronized via the Auxiliary Serial link between the two
Modems)
Switch Conditions Switchover initiated following:
•Unit faults only, or:
•Unit faults or Receive Traffic Faults, or:
•Unit faults or Transmit Traffic Faults, or:
•Unit faults or Receive or Transmit Traffic Faults
Fault detection time 1 second maximum
Switchover time Within 0.5 seconds of fault detection
Main Data Interfaces •RS422/EIA530 DCE (25 pin D-type female, pinout per EIA530) to 10 Mbps
•V.35 DCE to 10 Mbps
•Synchronous RS232 to 300 kbps
•Serial LVDS to 20 Mbps
•A standard HSSI interface is provided with the addition of the optional Comtech CIC-20
LVDS/HSSI Interface Converter module, for operation up to 20 Mbps
G.703 Interfaces •G.703, T1, E1, T2 and E2, balanced and unbalanced (BNC connectors for 75Ω
unbalanced, and 15 pin D-type for 120Ωbalanced)
•Note that for T1 and E1 Drop and Insert applications the unit supports Rx, Tx
connections, as well as Drop Data Out (DDO) and Insert Data In (IDI)
•‘G.703-like’ signals at 512 kbps and 1024 kbps (through DDO and IDI ports)
Overhead Interface Intelsat IESS-308/309/310 Open Network overhead signals, including:
•IDR Overhead Data Channels (64 kHz, 8kHz, and Octet clocks)
•IBS ESC and High-Rate ESC
•Balanced External Reference Input
•IDR Backward Alarm Inputs (25 pin D-type male)
Audio 2 x 4-wire 600 Ωaudio interface, per Intelsat IESS-308 (9 pin D-type female)
IDR Backward
Alarms Backward Alarm Outputs BA-1 through BA-4 (Form C relays) per Intelsat IESS-308 (15
pin D-type female)
External Reference •75ΩBNC, unbalanced input
•120Ωbalanced input
CRS-150 1:1 Redundancy Switch Revision 2
Introduction MN/CRS150.IOM
1–6
IF Switching/
Splitting •Transmit IF: Switched by RF relay (0.3 dB max loss)
•Receive IF: Passive power splitting (3.5 dB max loss)
IF Impedance •Optimized for 50Ω(> 20 dB return loss on external IF ports)
•75Ωsupported with the use of external RF transformers (supplied)
IF Connectors BNC female
IF Frequency range 52-176 MHz
Weight 4.6 lbs (2.1 kg)
Dimensions 1.75 inches (44.5 mm) high, 19 inches (482.5 mm) wide, 4.2 inches (107 mm) deep
(excluding connectors)
Power requirements 4.5 Watts maximum
+ 12 volts DC @ 250 mA (max)
-12 volts DC @ 120 mA (max)
•Power is supplied by the Online and Standby Modems, and the unit current shares
when both an >A= and >B= unit are present. These power supplies are electronically
fused and protected.
•A pair of auxiliary DC inputs are provided for powering external equipment connected to
the main data interface, such as a CIC-20 Interface Converter.
Approvals •‘CE’ as follows:
oEN 55022 Class B (Emissions)
oEN 50082-1 (Immunity)
oEN 60950 (Safety)
•FCC Part 15 Class B
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