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CRS-280
70/140 MHz IF Switch for 1:N Redundancy
CRS-280L
L-Band IF Switch for 1:N Redundancy
Installation and Operation Manual
Part Number MN-CRS-280/280L
Revision -
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.
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Table of Contents
Related Manuals for Comtech EF Data CRS-280L
Summary of Contents for Comtech EF Data CRS-280L
- Page 1 CRS-280 70/140 MHz IF Switch for 1:N Redundancy CRS-280L L-Band IF Switch for 1:N Redundancy Installation and Operation Manual Part Number MN-CRS-280/280L Revision - 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.
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Page 2: Revision History
CRS-280/280L IF Switch for 1:N Redundancy Revision - Copyright © 2018 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 Revision History Date Description 2-2018 Initial Release. -
Page 3: Table Of Contents
Rear Panel ..........................1–5 1.2.3 Dimensional Envelope ......................1–6 Summary of Specifications ......................1–8 1.3.1 CRS-280L Typical Insertion Loss Graphs ................1–10 CHAPTER 2. INSTALLATION .................. 2–1 Unpacking and Inspection ......................2–1 Mounting ............................2–2 CHAPTER 3. CONNECTOR PINOUTS ..............3–1 Connector Overview ........................ - Page 4 Overview ............................5–1 CRS-280L Input Power Cord Connections ................5–1 1:N Redundancy System Power-up Sequence ................ 5–2 5.3.1 CRS-280L operations with the CRS-500 M:N Redundancy System ........5–2 APPENDIX A. CABLE DRAWINGS ................. A-1 Introduction ..........................A-1 Control Interface Cables ......................A-2 A.2.1...
- Page 5 Figure 4-5. CRS-500 to CRS-280 Control Cable Connection ..............4–9 Figure 4-6. CRS-500 to CRS-280L Control Cable Connection ............... 4–10 Figure A-1. CRS-280L SMS-7000 Data Switch Unit (DSU) Control Cable (CEFD P/N CA/5343-1) ... A-3 Figure A-2. CRS-280L CRS-400, CRS-300 Control Cable (CEFD P/N CA/WR0066) ......A-4 Figure A-3.
- Page 6 C-280/280L IF Switch for 1:N Redundancy Revision - Acronym List Acronym Description Alternating Current Control Switch Unit Direct Current IF Switch Unit Light Emitting Diode Table of Contents TOC-4 MN-CRS-280/280L...
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Page 7: Preface
This is a technical document intended for earth station engineers, technicians, and operators responsible for the operation and maintenance of the CRS-280/280L. Comtech EF Data has reviewed this manual thoroughly in order to provide an easy-to-use guide to your equipment. All statements, technical information, and recommendations in this manual and in... -
Page 8: Conventions And References
Patents and Trademarks See all of Comtech EF Data's Patents and Patents Pending at http://patents.comtechefdata.com. Comtech EF Data acknowledges that all trademarks are the property of the trademark owners. Warnings, Cautions, and Notes A WARNING gives information about a possible hazard that MAY CAUSE DEATH or SERIOUS INJURY. -
Page 9: Recommended Standard Designations
Double pole / neutral fusing is used on the prime power supply input. This equipment is designed to minimize exposure of personnel to hazards. For further information, contact the Comtech EF Data Customer Support Department. The persons responsible for the operation and maintenance of the equipment must: •... -
Page 10: Fuses
The equipment is not designed for connection to a power system that has no direct connection to ground. The CRS-280L is shipped with line inlet cables suitable for use in the country of operation. If it is necessary to replace these cables, ensure the replacement has an equivalent specification. -
Page 11: Telecommunications Terminal Equipment Directive
CRS-280/280L IF Switch for 1:N Redundancy Revision - 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. Federal Communications Commission (FCC) 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. -
Page 12: Product Support
CRS-280/280L IF Switch for 1:N Redundancy Revision - To ensure that the CRS-280L continues to comply with these standards, observe the following instructions: Connections to the transmit and receive IF ports (‘N’ type female connectors) should be made using a good quality coaxial cable; for example, RG213/U. -
Page 13: Warranty Policy
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. -
Page 14: Exclusive Remedies
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... -
Page 15: Chapter 1. Introduction
CRS-280/280L IF Switch for 1:N Redundancy Revision - Chapter 1. INTRODUCTION Overview Figure 1-1. CRS-280 70/140 MHz IF Switch for 1:N Redundancy Figure 1-2. CRS-280L L-Band IF Switch for 1:N Redundancy Introduction 1–1 MN-CRS-280/280L... -
Page 16: Table 1-1. If Switch Compatibility Table
Redundant (backup) Modem and up to 10 Traffic Modems (prime channels). Operation of the CRS-280L is controlled by the switching system to which it is connected. The CRS-280L (L-Band) Switch is necessary when one or more modems within the redundancy system connect to the other polarization of the antenna or to multiple antennas. -
Page 17: Compatibility
The CRS-280L is not designed to convey Direct Current (DC) power to external equipment such as LNBs or BUCs. Do not apply DC power to the L-Band input and output (Type ‘N’) ports of the switch. In addition, the CRS-280L is not designed to pass to 10 MHz reference or FSK signaling. -
Page 18: Physical Description
The CRS-280 is constructed as a 4RU-high, rack-mounting chassis that can be freestanding, if desired. Rack handles are not supplied. The CRS-280L is constructed as a 4RU-high, rack-mounting chassis that can be freestanding, if desired. It is provided with rack handles at the front for easy removal from and placement into a rack. -
Page 19: Rear Panel
CRS-280/280L IF Switch for 1:N Redundancy Revision - 1.2.2 Rear Panel Control Interface Figure 1-6. CRS-280 Rear Panel Control Interfaces Ground Power Supply Power Supply Figure 1-7. CRS-280L Rear Panel Introduction 1–5 MN-CRS-280/280L... -
Page 20: Dimensional Envelope
CRS-280/280L IF Switch for 1:N Redundancy Revision - 1.2.3 Dimensional Envelope Figure 1-8. CRS-280 (70/140 MHz) IF Switch Dimensional Envelope Introduction 1–6 MN-CRS-280/280L... -
Page 21: Figure 1-9. Crs-280L (L-Band) If Switch Dimensional Envelope
CRS-280/280L IF Switch for 1:N Redundancy Revision - 17.00 (43.18) 13.92 (35.36) 13.18 (33.48) 6.96 (17.68) 19.00 (48.26) Figure 1-9. CRS-280L (L-Band) IF Switch Dimensional Envelope Introduction 1–7 MN-CRS-280/280L... -
Page 22: Summary Of Specifications
• CDM-570L (when used with CRS- 300 or CRS-500) 300 or CRS-500) • CDM-600L (when used with CRS- • CDM-600L (when used with CRS- Comtech EF Data Modems Supported 300) 300) • CDM-9600L (when used with CRS- • CDM-9600L (when used with CRS-... - Page 23 CRS-280/280L IF Switch for 1:N Redundancy Revision - CRS-280 CRS-280L Equipment Type (70/140 MHz) (L-Band) 25-pin sub-D female, compatible with • 25-pin sub-D female, compatible CRS-300 controller with CRS-300 controller Control Interface • 15-pin sub-D female, compatible with SMS-7000 Received from an external power...
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Page 24: Crs-280L Typical Insertion Loss Graphs
CRS-280/280L IF Switch for 1:N Redundancy Revision - 1.3.1 CRS-280L Typical Insertion Loss Graphs Figure 1-10. Graph 1 – Downlink Input to Rx Output Introduction 1–10 MN-CRS-280/280L... -
Page 25: Figure 1-11. Graph 2 - Downlink Input To Backup Rx Output
CRS-280/280L IF Switch for 1:N Redundancy Revision - Figure 1-11. Graph 2 – Downlink Input to Backup Rx Output Introduction 1–11 MN-CRS-280/280L... -
Page 26: Figure 1-12. Graph 3 - Backup Input To Selected Uplink Output
CRS-280/280L IF Switch for 1:N Redundancy Revision - Figure 1-12. Graph 3 – Backup Input to Selected Uplink Output Introduction 1–12 MN-CRS-280/280L... -
Page 27: Figure 1-13. Graph 4 - Tx Input To Associated Uplink Output
CRS-280/280L IF Switch for 1:N Redundancy Revision - Figure 1-13. Graph 4 – Tx Input to Associated Uplink Output Introduction 1–13 MN-CRS-280/280L... - Page 28 CRS-280/280L IF Switch for 1:N Redundancy Revision - Notes: Introduction 1–14 MN-CRS-280/280L...
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Page 29: Chapter 2. Installation
Open the carton and remove the contents. Check the contents against the packing list to verify completeness of the shipment. If damage is evident, contact the carrier and Comtech EF Data immediately and submit a damage report. If the unit needs to be returned to Comtech EF Data, use the original shipping container. -
Page 30: Mounting
IFU (CEFD legacy product SMS-7000) for L-Band applications. The CRS-280L is constructed as a 4RU-high, rack-mounting chassis. Rack handles at the front of the unit facilitate removal from and placement into a rack. It is compatible with mounting at the top, back, or front of the rack (refer to the associated controller documentation for additional details). -
Page 31: Chapter 3. Connector Pinouts
CRS-280/280L IF Switch for 1:N Redundancy Revision - Chapter 3. CONNECTOR PINOUTS Connector Overview Chapter 4. CABLES CONNECTIONS See Chapter 4. CABLES CONNECTIONS for complete details on IF cabling between the CRS-280/280L and its companion redundant switches, redundant and traffic modems, and uplink and downlink equipment. -
Page 32: Crs-280 Connector Overview
CRS-280/280L IF Switch for 1:N Redundancy Revision - 3.1.1 CRS-280 Connector Overview Front Panel View Rear Panel View Figure 3-1. CRS-280 Connectors The front and rear panels of the CRS-280 IF Switch are shown in Figure 3-1. The front panel connectors provide all necessary connections to connect all equipment internal and external to the 1:N redundancy setup. -
Page 33: Table 3-1. Crs-280 External Connectors (Front And Rear Panel)
CRS-500 Redundancy Switching products Interface ** Indicates a Comtech EF Data legacy product that is no longer in production. The European EMC Directive (EN55022, EN50082-1) requires using properly shielded cables for DATA I/O. These cables must be double-shielded from end-to-end, ensuring a continuous ground shield. -
Page 34: Crs-280L Connector Overview
Rear Panel View (Standard AC Unit shown) Figure 3-2. CRS-280L Connectors The front and rear panels of the CRS-280L L-Band IF Switch are shown in Figure 3-2. The front panel connectors provide all necessary connections to connect all equipment internal and external to the 1:N redundancy setup. -
Page 35: Table 3-2. Crs-280L External Connectors (Front And Rear Panel)
#10-32 stud Common Chassis Ground ** Indicates a Comtech EF Data legacy product that is no longer in production. The European EMC Directive (EN55022, EN50082-1) requires using properly shielded cables for DATA I/O. These cables must be double-shielded from end-to-end, ensuring a continuous ground shield. -
Page 36: Front Panel Connectors
The CRS-280L performs the same bridging and backing up functions of the Tx and Rx IF signals to match what the companion redundant switch does to the terrestrial data signals. -
Page 37: Crs-280L Switch Control Interface Connectors
The CRS-280L performs the same bridging and backing up functions of the Tx and Rx IF signals to match what the companion redundant switch does to the terrestrial data signals. -
Page 38: Power / Ground Connections
Two AC power supplies – one primary, one backup – are provided. For each, a standard, detachable, non-locking 3-prong power cord (IEC plug) supplies the Alternating Current (AC) power to the CRS-280L. Observe the following: Standard AC Power Specifications Input Power... -
Page 39: Ground Connector
Revision - 3.3.2.4 Ground Connector The AC power connector provides the safety ground. A #10-32 stud, located to the lower left hand side of the CRS-280L rear panel, is provided for connecting a common chassis ground among equipment. Connector Pinouts 3–9... - Page 40 CRS-280/280L IF Switch for 1:N Redundancy Revision - BLANK PAGE Connector Pinouts 3–10 MN-CRS-280/280L...
- Page 41 Chapter 2. INSTALLATION Appendix A. CABLE DRAWINGS When assembling a Comtech EF Data 1:N Redundancy System, in addition to purchasing the desired modem group (one Redundant modem, up to 10 Traffic modems) and the appropriate companion switch (i.e., CRS-300, CRS-500 etc.), the user is also required to purchase all cables and components required for interconnection of the redundant configuration to various interfaces (i.e., control, IF, and data).
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Page 42: Chapter 4. Cables And Connections
CA-0021666 Control Cable, DB-9F DB-25M, 8’ ** Indicates a Comtech EF Data legacy product that is no longer in production. 1. When connecting the Control cable between the CRS-280L and the redundancy switch, ensure that screw locks on the ‘D’ type connectors are securely fastened. -
Page 43: Sms-7000 1:8 Modem Protection Switch Control Cable Connection
Control/Modem side of the SMS-7000 Data Switch Unit (DSU). Note: The CRS-280L serves to replace, in its entirety, the SMS-7000 IF Switch Unit (IFU). Secure the cable by tightening the screw locks on both ends of the control cable. -
Page 44: Crs-500 M:n Redundancy System Control Cable Connection
CRS-280/280-L IF Switch for 1:N Redundancy Revision - 4.2.4 CRS-500 M:N Redundancy System Control Cable Connection As shown in Figure 4-5 and Figure 4-6: Step Instructions Connect the DB-25M connector of the CA-0021666 Control Cable to the DB-25F J1 CRS Control Interface port on the rear panel of the CRS-280/280L. -
Page 45: Figure 4-1. Sms-7000 To Crs-280L Control Cable Connection
CRS-280/280-L IF Switch for 1:N Redundancy Revision - Figure 4-1. SMS-7000 to CRS-280L Control Cable Connection The Comtech EF Data SMS-7000 1:8 Modem Protection Switch is a legacy product that is no longer in production. Cables and Connections 4–5 MN-CRS-280/280L... -
Page 46: Figure 4-2. Crs-400 To Crs-280L Control Cable Connection
CRS-280/280-L IF Switch for 1:N Redundancy Revision - Figure 4-2. CRS-400 to CRS-280L Control Cable Connection The Comtech EF Data CRS-400 1:8 Redundancy Switch is a legacy product that is no longer in production. Cables and Connections 4–6 MN-CRS-280/280L... -
Page 47: Figure 4-3. Crs-300 To Crs-280 Control Cable Connection
CRS-280/280-L IF Switch for 1:N Redundancy Revision - Figure 4-3. CRS-300 to CRS-280 Control Cable Connection Cables and Connections 4–7 MN-CRS-280/280L... -
Page 48: Figure 4-4. Crs-300 To Crs-280L Control Cable Connection
CRS-280/280-L IF Switch for 1:N Redundancy Revision - Figure 4-4. CRS-300 to CRS-280L Control Cable Connection Cables and Connections 4–8 MN-CRS-280/280L... -
Page 49: Figure 4-5. Crs-500 To Crs-280 Control Cable Connection
CRS-280/280-L IF Switch for 1:N Redundancy Revision - Figure 4-5. CRS-500 to CRS-280 Control Cable Connection Cables and Connections 4–9 MN-CRS-280/280L... -
Page 50: Figure 4-6. Crs-500 To Crs-280L Control Cable Connection
CRS-280/280-L IF Switch for 1:N Redundancy Revision - Figure 4-6. CRS-500 to CRS-280L Control Cable Connection Cables and Connections 4–10 MN-CRS-280/280L... -
Page 51: Cable Connections
4.3.2 CRS-280L L-Band IF Cable Connections Cables for connecting the CRS-280L L-Band IF Switch to the L-Band modems within the redundancy system are available for purchase from Comtech EF Data and can be ordered at the same time the order is placed for the CRS-280L: CEFD Part No. -
Page 52: L-Band Uplink/Downlink Cable Connections
CEFD recommends that connections to uplink and downlink equipment be made after all other system cabling and configuration is complete. Cabling to and from the CRS-280L uplink and downlink ports is dependant on the system configuration and the uplink/downlink equipment used. -
Page 53: Chapter 5. Redundancy System Configuration / Operation
Ensure that both power supply switches are in the off position before connecting the power supply power cords. Each CRS-280L is supplied with two power cords – one for each power supply power input. Connect the female end of each supplied power cords to its mating socket. -
Page 54: 1:N Redundancy System Power-Up Sequence
Instructions Turn on the redundant and traffic L-Band modems. Power up the CRS-280L L-Band IF Switch switch by turning both power supply switches, located on the CRS-280L rear panel, to the on position. Once the power supplies are turned on, both power status LEDs (A and B) on the front panel should illuminate green. -
Page 55: Appendix A. Cable Drawings
Appendix A. CABLE DRAWINGS A.1 Introduction This appendix contains drawings of cables used with the CRS-280 (70/140 MHz) and the CRS-280L (L-Band) IF Switch for 1:N Redundancy. These cables are broken into two categories – Control Interface Cables and IF Interface Cables: •... -
Page 56: Control Interface Cables
CA-0021666 Control Cable, DB-25M DB-9F, 8’ CRS-280/280L CRS-500 Data Switch Unit (DSU) The Comtech EF Data SMS-7000 1:8 Modem Protection Switch and CRS-400 1:8 Redundancy Switch are legacy products that are no longer in production. Appendix A MN-CRS-280/280L... -
Page 57: Sms-7000 Control Cable
Revision - A.2.1 SMS-7000 Control Cable The Comtech EF Data SMS-7000 1:8 Modem Protection Switch is a legacy product that is no longer in production. Figure A-1. CRS-280L SMS-7000 Data Switch Unit (DSU) Control Cable (CEFD P/N CA/5343-1) Appendix A... -
Page 58: Crs-400/Crs-300 Control Cable
CRS-280/280L IF Switch for 1:N Redundancy Revision - A.2.2 CRS-400/CRS-300 Control Cable The Comtech EF Data CRS-400 1:8 Redundancy Switch is a legacy product that is no longer in production. Figure A-2. CRS-280L CRS-400, CRS-300 Control Cable (CEFD P/N CA/WR0066) Appendix A MN-CRS-280/280L... -
Page 59: Crs-500 Control Cable
CRS-280/280L IF Switch for 1:N Redundancy Revision - A.2.3 CRS-500 Control Cable Figure A-3. CRS-280/280L CRS-500 Data Switch Unit (DSU) Control Cable (CEFD P/N CA-0021666) Appendix A MN-CRS-280/280L... -
Page 60: If Interface Cable, Type 'N' 50Ω
CRS-280/280L IF Switch for 1:N Redundancy Revision - A.3 IF Interface Cable, Type ‘N’ 50Ω CEFD P/N DIM ‘A’ CA/RF10453-2 24.00 ± .80 CA/RF10453-4 48.00 ± 1.50 CA/RF10453-6 72.00 ± 3.00 CA/RF10453-8 96.00 ± 3.00 Figure A-4. Type ‘N’ 50Ω IF Coax Cable (CEFD P/N CA/RF10453-x) Appendix A MN-CRS-280/280L... -
Page 61: Appendix B. Crs-280L Power Supply Module Replacement
DC module (CEFD P/N PL 0000355). These modules are the only field replaceable components in the CRS-280L. This appendix illustrates the procedure required to remove and install a CRS-280L power supply module (Figure B 1) into any CRS 280L L-Band IF Switch unit. -
Page 62: Figure B-1. Crs-280L Rear Panel (Shown With Pl/10207-1 Ac Modules
CRS-280/280L IF Switch for 1:N Redundancy Revision - Power Supply Power Supply Figure B-1. CRS-280L Rear Panel (shown with PL/10207-1 AC Modules) Appendix B B–2 MN-CRS-280/280L... -
Page 63: Power Supply Module Removal Procedure
CRS-280/280L IF Switch for 1:N Redundancy Revision - Power Supply Module Removal Procedure Step Task DISCONNECT THE CRS-280L FROM ITS POWER SOURCE! For AC Units (pictured): Shut off the AC power switch on both power supply modules and disconnect both power cords from their receptacles. - Page 64 CRS-280/280L IF Switch for 1:N Redundancy Revision - Step Task Carefully remove the Power Supply Cable from its mating connector on the old power supply module PCB, then set the old power supply module aside. Power Supply Cable Appendix B B–4 MN-CRS-280/280L...
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Page 65: Power Supply Module Installation Procedure
CRS-280/280L IF Switch for 1:N Redundancy Revision - Power Supply Module Installation Procedure Step Task Identify for assembly the Power Supply Cable (connected to the CRS-280L chassis PCB), and its mating connector on the new power supply module PCB. Appendix B B–5... - Page 66 PCB. Power Supply Cable Assemble the power supply module plate to the CRS-280L chassis, taking care not to crimp the Power Supply Cable when doing so, then tighten the four captive mounting screws of the module to secure the module in place.
- Page 67 The unit may be reconnected to both DC power sources once all control and IF cabling connections have been confirmed. The module installation has been completed and the CRS-280L L-Band Switch for 1:N Redundancy is ready for operation. Appendix B B–7 MN-CRS-280/280L...
- Page 68 CRS-280/280L IF Switch for 1:N Redundancy Revision - BLANK PAGE Appendix B B–8 MN-CRS-280/280L...
- Page 70 2114 85281 WEST TH STREET TEMPE ARIZONA 480 • 333 • 2200 PHONE 480 • 333 • 2161...