CRS-120
1:1 Redundancy Switch
Installation and Operation Manual
IMPORTANT NOTE: The information contained in this document supercedes all previously published information
regarding this product. Product specifications are subject to change without prior notice.
Part Number MN/CRS120.IOM Revision 3
CRS-120
1:1 Redundancy Switch
Installation and Operation Manual
Comtech EF Data is an ISO 9001
Revision 3
Registered Company.
Copyright © Comtech EF Data, 2004. 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.
Part Number MN/CRS120.IOM
November 28, 2005
Customer Support
Contact the Comtech EF Data Customer Support Department for:
• Product support or training
• Information on upgrading or returning a product
• Reporting comments or suggestions concerning manuals
A Customer Support representative may be reached at:
Comtech EF Data
Attention: Customer Support Department
2114 West 7th Street
Tempe, Arizona 85281 USA
480.333.2200 (Main Comtech EF Data Number)
480.333.4357 (Customer Support Desk)
480. 333.2161 FAX
or, E-Mail can be sent to the Customer Support Department at:
service@comtechefdata.com
Contact us via the web at www.comtechefdata.com
1. To return a Comtech EF Data product (in-warranty and out-of-warranty) for
repair or replacement:
2. Request a Return Material Authorization (RMA) number from the Comtech EF
Data 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 EF Data. (Shipping charges should be
prepaid.)
For more information regarding the warranty policies, see Warranty Policy, p. xi.
.
ii
Table of Contents
CHAPTER 1. INTRODUCTION .................................................................................. 1–1
1.1 Introduction....................................................................................................................................1–1
1.2 Description ....................................................................................................................................1–2
1.3 Front Panel.................................................................................................................................... 1–5
1.4 Rear Panel ....................................................................................................................................1–5
1.5 Side Panel - Right Side ................................................................................................................. 1–6
CHAPTER 2. INSTALLATION.................................................................................... 2–1
2.1 Unpacking ..................................................................................................................................... 2–1
2.2 Mounting........................................................................................................................................2–1
2.2.1 CRS-120 Optional Mounting Panel..................................................................................... 2–2
2.2.2 CRS-120L Optional Mounting Panel................................................................................... 2–3
2.3 Connect External Cables ..............................................................................................................2–4
2.2.1 CRS-120 Wiring Connections ............................................................................................. 2–4
2.2.2 CRS-120L Wiring Connections ........................................................................................... 2–5
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Preface MN/CRS120.IOM
CHAPTER 3. CONNECTOR PINOUTS ...................................................................... 3–1
3.1 External Modem Connections ....................................................................................................... 3–1
3.1.1 Alarm Interface Pin Assignment J1A, J1B ..........................................................................3–2
3.1.2 Online Status Connector Pin Assignments, J2 ...................................................................3–2
3.1.3 CRS-120 Only. TX-IF Connectors, J3, J4, J5, J6A, J6B ....................................................3–3
3.1.4 CRS-120L Only. SMA Connectors J3, J4, J5, J6A, J6B .................................................... 3–3
3.1.5 Standby TX IF Out Switch................................................................................................... 3–3
CHAPTER 4. OPERATION......................................................................................... 4–1
4.1 Introduction....................................................................................................................................4–1
4.2 1:1 Operation.................................................................................................................................4–2
4.3 1:1 Remote Control Operation ......................................................................................................4–3
CHAPTER 5. SUMMARY OF SPECIFICATIONS....................................................... 5–1
5.1 Summary of Specifications............................................................................................................ 5–1
5.1.1 CRS-120 Summary of Specifications ................................................................................. 5–2
5.1.2 CRS-120L Summary of Specifications ............................................................................... 5–3
5.2 1:1 Latching Operation..................................................................................................................5–4
5.3 Tx Online Status Contacts ............................................................................................................5–5
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1:1 Redundancy Switch Revision 3
Preface MN/CRS120.IOM
Figures
Figure 1-1. 1:1 Redundancy Switch........................................................................................................................................ 1–1
Figure 1-2. Block Diagram ...................................................................................................................................................... 1–3
Figure 1-3. Dimensional Envelope of CRS-120 PL/10979-1................................................................................................... 1–6
Figure 1-4. Dimenional Envelope of CRS-120L...................................................................................................................... 1–7
Figure 2-1. CRS-120 Optional Mounting Panel....................................................................................................................... 2–2
Figure 2-2. CRS-120L Optional Mounting Panel..................................................................................................................... 2–3
Figure 2-3. CRS-120 Typical Installation ................................................................................................................................ 2–4
Figure 2-4. CRS-120L Typical Installation .............................................................................................................................. 2–5
Figure 4-1. Typical View of Modulator Front Panel................................................................................................................. 4–1
Tables
Table 3-1. CRS-120 Connectors and Pin Assignments.......................................................................................................... 3–1
Table 3-2. CRS-120L Connectors and Pin Assignments........................................................................................................ 3–1
Table 5-1. CRS-120 Summary of Specifications..................................................................................................................... 5–2
Table 5-2. CRS-120L Summary of Specifications................................................................................................................... 5–3
Table 5-3. 1:1 Latching Operation........................................................................................................................................... 5–4
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1:1 Redundancy Switch Revision 3
Preface MN/CRS120.IOM
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1:1 Redundancy Switch Revision 3
Preface MN/CRS120.IOM
About this Manual
This manual provides installation and operation information for the Comtech EF Data
CRS-120/-120L 1:1 Redundancy Switch. This is a technical document intended for earth
station engineers, technicians, and operators responsible for the operation and
maintenance of the 1:1 Redundancy Switch.
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
WARN ING
unsafe practices or risks of property damage.
WARNING indicates a potentially hazardous situation that, if not avoided,
could result in death or serious injury.
Indicates information critical for proper equipment function.
IMPORTANT
Overview to Changes made to Revision 2
vii
1:1 Redundancy Switch Revision 3
Preface MN/CRS120.IOM
Metric Conversion
Metric conversion information is located on the inside back cover of this manual. This
information is provided to assist the operator in cross-referencing English to Metric
conversions.
Trademarks
Other product names mentioned in this manual may be trademarks or registered
trademarks of their respective companies and are hereby acknowledged.
Reporting Comments or Suggestions Concerning this Manual
Comments and suggestions regarding the content and design of this manual will be
appreciated. To submit comments, please contact the Comtech EF Data Customer
Support Department.
Safety Notices
IMPORTANT INFORMATION –
PLEASE READ BEFORE INSTALLATION AND USE
viii
1:1 Redundancy Switch Revision 3
Preface MN/CRS120.IOM
Electrical Safety
The 1:1 redundancy switch has been shown to comply with the following safety standard:
EN 60950: Safety of Information Technology Equipment, including electrical
business machines
The equipment is rated for operation at +12 volts DC. It has a maximum
power consumption of 1.2 watts, and draws a maximum of 100 mA at
+12 volts DC. A single modulator is capable of supplying the entire
current.
The User should observe the following instructions:
Equipment Connection
The 1:1 redundancy switch is designed for operation ONLY with Comtech CDM-500,
CDM-550 or CDM-550T Modems. These Modems supply DC operating current
(electronically fused and protected) and control signals for the correct functioning of this
unit. Connection to other manufacturer’s equipment could result in damage to the unit.
Environmental
The 1:1 redundancy switch must not be operated in an environment where the unit is
exposed to extremes of temperature outside the ambient range 0 to 50°C (32 to 122°F),
precipitation, condensation, or humid atmospheres above 95% RH, altitudes
(un-pressurised) greater than 2000 metres, excessive dust or vibration, flammable gases,
corrosive or explosive atmospheres.
Operation in vehicles or other transportable installations which are equipped to provide a
stable environment is permitted. If such vehicles do not provide a stable environment,
safety of the equipment to EN60950 may not be guaranteed
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.
ix
1:1 Redundancy Switch Revision 3
Preface MN/CRS120.IOM
EMC (Electromagnetic Compatibility)
The 1:1 redundancy switch has been demonstrated, by independent testing, to comply
with the following standards:
Emissions: EN 55022 Class B - Limits and methods of measurement of radio
interference characteristics of Information Technology Equipment.
FCC Part 15 Class B
Immunity: EN 50082 Part 1 - Generic immunity standard, Part 1: Domestic,
commercial and light industrial environment.
In order that the 1:1 redundancy switch 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 (50 Ω) or
RG59/U (75 Ω).
• All 'D' type connectors attached to the unit must have back-shells which provide
continuous metallic shielding. Cable with a continuous outer shield (either foil or
braid, or both) must be used, and the shield must be bonded to the back-shell.
• The equipment must be operated with its cover on at all times. If it becomes
necessary to remove the cover, the User should ensure that the cover is correctly
re-fitted before normal operation commences.
x
1:1 Redundancy Switch Revision 3
Preface MN/CRS120.IOM
Warranty Policy
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.
Limitations of Warranty
The foregoing warranty shall not apply to defects resulting from improper installation or
maintenance, abuse, unauthorized modification, or operation outside of environmental
specifications for the product, or, for damages that occur due to improper repackaging of
equipment for return to Comtech EF Data.
No other warranty is expressed or implied. Comtech EF Data specifically disclaims the
implied warranties of merchantability and fitness for particular purpose.
Exclusive Remedies
The remedies provided herein are the buyer's sole and exclusive remedies. Comtech EF
Data shall not be liable for any direct, indirect, special, incidental, or consequential
damages, whether based on contract, tort, or any other legal theory.
Disclaimer
Comtech EF Data has reviewed this manual thoroughly in order that it will be an easy-touse guide to your equipment. All statements, technical information, and
recommendations in this manual and in any guides or related documents are believed
reliable, but the accuracy and completeness thereof are not guaranteed or warranted, and
they are not intended to be, nor should they be understood to be, representations or
warranties concerning the products described. Further, Comtech EF Data reserves the
right to make changes in the specifications of the products described in this manual at any
time without notice and without obligation to notify any person of such changes.
If you have any questions regarding your equipment or the information in this manual,
please contact the Comtech EF Data Customer Support Department.
xi
1:1 Redundancy Switch Revision 3
Preface MN/CRS120.IOM
Notes:
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xii
Chapter 1. INTRODUCTION
1.1 Introduction
The 1:1 Redundancy Switch (Figure 1) is available in either a 70/140 MHz application or an
L-Band application to support modulator backup.
• The CRS-120 is a companion product that provides 70/140 MHz switching (75Ω only)
for the Comtech EF Data (CEFD) CDM-710 Satellite Modem equipt as a Modulator and
is procurable as 1:1 Switch Kit P/N KT/11084-3 consisting of the switch and the
necessary installation cables.
• The CRS-120L is an L-Band version of the 1:1 Switch for operation with the
L-Band version of the . A 1:1 Switch Kit, KT/ 11362-3 is available for L-Band.
The 1:1 controller is within the modulator and provides control and drive signals to the 1:1
redundancy switch. This combination continuously monitors a pair of modulators so that, in the
event of an equipment failure (or an undesired traffic condition), the subsystem automatically
switches IF signals from the failed unit to the Standby unit. In this manner, IF traffic paths are
fully protected. The CRS-120 / CRS-120L provides IF / L-Band switchover only. It does not
support switchover of data circuits.
CRS-120 CRS-120L
Figure 1-1. 1:1 Redundancy Switch
1–1
1:1 Redundancy Switch Revision 3
Introduction MN/CRS120.IOM
The 1:1 redundancy switch does not support switchover of data circuits.
IMPORTANT
Accordingly, a 1:1 system comprises an Online Modulator, a Standby Modulator, and the 1:1
redundancy switch Switch.
Note that the 1:1 redundancy switch was designed specifically as
an accessory product for the CEFD CDM-710 Satellite Modem,
WARN ING
equipt as a Modulator, and is not intended for use with any other
manufacturer’s equipment.
Read this specification in conjunction with the specifications for the
CDM-710 , as details of the operation of that equipment is not covered
IMPORTANT
in this document.
1.2 Description
The 1:1 redundancy switch connects two modulators, an Online unit and a Standby unit. It
monitors the fault status of these two units, and controls the routing of IF signals though the
controller from the two units. When there is an equipment failure, switching automatically takes
place to protect the IF traffic circuit. Figure 1-2 illustrates the 1:1 redundancy switch connected in
a 1:1 application with two modulators.
The 1:1 redundancy switch derives its operating power from the two modulators - Online and
Standby. A diode sharing arrangement, with a current sharing circuit ensures that in normal
operation power is taken equally from the two modulators. However, in the event that one of the
two units is removed, the remaining unit supplies the entire current requirement. The Modulators
supply +12 volts DC individually up to160 mA max. The modulators employ electronic fuses,
which prevent excessive current from being drawn by the 1:1 redundancy switch, should an
anomalous condition occur.
1–2
1:1 Redundancy Switch Revision 3
Introduction MN/CRS120.IOM
Data
Ethernet
RS485
Ethernet
Data
Modulator
Modulator
A
A
Alarm
P2
A
Modulator
Modulator
B
B
Alarm
P2
B
Tx-A
J1
15 Pin D-M
Alarm Cable
Tx-B
J1
15 Pin D-M
Alarm Cable
J6A
J6B
J1A
(Top)
C
D
J1B
(Bottom)
15 Pin D-F
15 Pin D-F
Tx A
IF
Tx B
Switch
+12 VDC
CRS-120 or CRS-120L
Coil
Coil
IF
IF
Coupler
Coupler
9 Pin D-F
J5 Tx Standby
J4 Tx Online
J3 Tx Mon -20 dB
B Online LED
A Online LED
Online Status
Contacts
J2
B
DIP Switch
Standby
Tx IF Out
A
Figure 1-2. Block Diagram
1–3
1:1 Redundancy Switch Revision 3
Introduction MN/CRS120.IOM
The operating mode for the 1:1 subsystem is as follows:
Latching mode
The online (A) and standby (B) units are established with no faults.
When a failure occurs in the online unit switchover occurs and there
is no further switching unless there is intervention via the remote
control or front panel.
There also are two selections for the Standby Tx-IF, Off and On (DIP switches are located on the
1:1 redundancy switch:
Standby Tx-IF = On
Standby Tx-IF = Off
This is the default method of operation. With the On selection, the
Standby Tx carrier remains ON provided no Tx or unit fault affecting
the carrier is present.
With this selection, only one modulator 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 because the switch
applies the TX Carrier Off signal to the Standby unit. The CRS-120
provides further isolation (and security) by using an RF relay within
the unit. The RF relay delivers a low loss signal from the IF port of the
modulator to the Online port of the switch compared to the 3.5 dB
loss introduce with methods that use a power combiner.
A special mode of operation is provided for 1:1 redundancy.
Loss Of Tx Data
A loss of Tx Data into the modulator will produce a fault into the
modulator. Switchover occurs provided both units do not
simultaneously lose Tx Data. In this mode, the loss of Tx Data does
not turn off the Tx carrier. This alarm is masked under Alarm Mask
section of the menus in the modulator.
Fault status information is fed from each of the two modulators, via the Alarms Interface
connector. Based on the fault status the ‘A’ or ‘B’ is placed online. The 1:1 redundancy switch
simultaneously indicates to the microcontroller within the Standby unit that the unit is no longer
‘Online’. This results in the ‘Online’ LED on the front panel of the unit 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 same time, a green LED will illuminate on the front of the
1:1 redundancy switch to indicate whether the ‘A’ or ‘B’ unit is Online.
The customer selects the operating modes within the modulators and their 1:1 controllers
determine the conditions for switchover. By examining the fault status of both units, it is
determined if the fault is external to the system.
1–4
1:1 Redundancy Switch Revision 3
Introduction MN/CRS120.IOM
1.3 Front Panel
The CRS-120 Switch: On the front panel (Figure 1-3) of the unit are the following IF connectors,
which are BNC female:
J3 Tx IF Mon 20dB, a sample of the Tx Online signal for test purposes
J4 Tx IF Online, the output connector with the Tx Carrier
J5 Tx IF Standby, which connects to the Standby modulator
The CRS-120L Switch: On the front panel (Figure 1-4) of the unit are the following connectors,
which are SMA female:
J3 20dB Mon, a sample of the Online signal for test purposes
J4 Online, the output connector with the Tx Carrier
J5 Standby, which connects to the Standby modulator
Additionally, on the front panel are two LEDs, marked ‘A Online’ and ‘B Online’. Only one of
these LEDs will illuminated at any given time, and provide a visual indication of which of the
two units is presently carrying traffic. There also is a 9-pin D female connector (J2) with a set of
From-C contacts to indicate whether A or B is online.
Also on the front panel is a ground stud, which may be used, if desired, to bond the chassis of the
unit to the system ground. The front panel also contains mounting points to attach an optional 19inch panel to secure the unit to rear of a cabinet if desired.
The front panel also contains DIP to select the whether a carrier is produced in an unfaulted
Standby unit.
1.4 Rear Panel
Located on the rear panel are the two Alarm Interface connectors for the ‘A’ and ‘B’ units, each
being 15-pin ‘D’ type female. These are connected to the Modulators using the two supplied
cables.
IMPORTANT
The CRS-120L Switch: The CRS-120L (L-Band) has two connectors (J6A/J6B) ‘A’ and ‘B’,
which are both SMA female. Connection is made to the pair of Modulators using coaxial cables
with SMA-Male connectors.
REMEMBER!
The top unit is ‘A’
The bottom unit is ‘B’
1–5
1:1 Redundancy Switch Revision 3
Introduction MN/CRS120.IOM
1.5 Side Panel - Right Side
The CRS-120 Switch: On the side panel of the CRS-120 (70/140 MHz) to the right are the two
TX IF ports (J6A/J6B), ‘A’ and ‘B’, which are both BNC female. Connection is made to the pair
of Modulators using coaxial cables with BNC-Male connectors.
15P DSUB FEM/FEM
.625 STACK HEIGHT
1.680
4.11
#10-32 HARDWARE
Standby
Tx IF Out
A B
On On
Off Off
C
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1
2
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S
/
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1
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9 PIN DSUB FEM
Figure 1-3. Dimensional Envelope of CRS-120 (P/L 10979-1)
5X BNC JACK
1–6
1:1 Redundancy Switch Revision 3
Introduction MN/CRS120.IOM
DSUB
9
Standb y
Tx IF Out
A B
On On
Off Off
J2
Online Status
Online
A B
JACK
J3
-20dB Mon
J4
Online
J5
Standby
5X
THIS END TO END USER
(ROTATED 180%%D FOR CLARITY)
SMA
CONNECTORS
THIS END TO MODEMS
5.185.57
CRS-120L
L-BAND
SWITCH MODULE
THIS DEVICE COMPLIES WITH PART 15 OF THE FCC
RULES. OPERATION IS SUBJECT TO THE FOLLOWING
TWO CONDITIONS:
(1) THIS DEVICE MAY NOT CAUSE HARMFUL
INTER FERENC E AND
(2) THIS DEVICE MUST ACCEPT ANY INTERFERENCE
RECEIVED, INCLUDING INTERFERENCE THAT MAY
CAUSE UNDESIRED OPERATION.
J6B
Tx IF B
J6A
Tx IF A
J1A (Top) / J1B (Bottom)
8.15
Figure 1-4. Dimensional Envelope of the CRS-120L (PL/11362-1)
MANUFACTURED
IN THE USA
S/N LABEL
P/N LABEL
Alarms Interface
1–7
1:1 Redundancy Switch Revision 3
Introduction MN/CRS120.IOM
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1–8
2.1 Unpacking
The switch and manual are packaged in pre-formed, reusable, cardboard cartons containing foam
spacing for maximum shipping protection.
Do not use any cutting tool that will extend more than 1 inch into the
container. This can cause damage to the modem.
CAUTION
Unpack the switch as follows:
1. Cut the tape at the top of the carton indicated by OPEN THIS END.
2. Remove the cardboard/foam space covering the switch.
3. Remove the switch, manual, and power cord from the carton.
4. Save the packing material for storage or reshipment purposes.
5. Inspect the equipment for any possible damage incurred during shipment.
6. Check the equipment against the packing list to ensure the shipment is correct.
Chapter 2. INSTALLATION
2.2 Mounting
The 1:1 redundancy switch is designed to be connected and self-supporting at the rear of the two
modulators. The two alarm cables provide this support, but in most rack installations additional
support is usually provided by physically anchoring the connecting cables.
2–1
1:1 Redundancy Switch Revision 3
Installation MN/CRS120.IOM
2.2.1 CRS-120 Optional Mounting Panel
An optional mounting panel (KT/11084-2) is available to attach the 1:1 redundancy switch to the
standard 19-inch cabinet. Install Mounting Panel as follows:
1. Remove two bottom switch screws (Figure 2-1)and set a side.
2. Remove two upper switch screws and discard.
3. Remove grounding nuts and washers from grounding lug and set aside.
4. Position mounting panel onto switch.
5. Reinstall gounding nuts and washers previously removed.
6. Reinstall two bottom switch screws previously removed.
7. Install two kit screws (component of KT/11084-2) and secure.
Grounding Lug Nuts and
Washers
CRS-120 Switch
Kit Screw
(Typical 2 Places)
Switch Screw
(Typical 2 Places)
Optional: Mounting Panel
Figure 2-1. CRS-120 Optional Mounting Panel
2–2
1:1 Redundancy Switch Revision 3
Installation MN/CRS120.IOM
2.2.2 CRS-120L Optional Mounting Panel
An optional mounting panel (KT/11362-2) is available to attach the 1:1 redundancy switch to the
standard 19-inch cabinet. Install Mounting Panel as follows:
1. Remove two bottom switch screws (Figure 2-2) and set a side.
2. Remove the two upper switch screws and discard.
3. Remove grounding nuts and washers from grounding lug and set aside.
4. Position mounting panel onto switch.
5. Reinstall gounding nuts and washers previously removed.
6. Reinstall two bottom switch screws previously removed.
7. Install two kit screws (component of KT/11362-2) and secure.
Kit Screws
(Typical 2 Places)
Grounding Lug Nuts and Washers
Switch Screws
(Typical 2 Places)
Optional: Mounting Panel
Figure 2-2. CRS-120L Optional Mounting Panel
2–3
1:1 Redundancy Switch Revision 3
Installation MN/CRS120.IOM
2.3 Connect External Cables
2.3.1 CRS-120 Wiring Connection
Figure 2-3 shows how to connect a pair of Modems together with the 1:1 redundancy switch.
CEFD P/N CA/WRBNC750OHM
IF Cable (2 Places)
Modulator “A”
Modulator “B”
CEFD P/N CA/WR11002-2
DB-15 Alarm Interface (2 Places)
CRS-120
Figure 2-3. CRS-120 Typical Installation
2–4
1:1 Redundancy Switch Revision 3
Installation MN/CRS120.IOM
2.3.2 CRS-120L Wiring Connection
Figure 2-4 shows how to connect a pair of Modems together with the 1:1 redundancy switch.
Modulator “A”
Modulator “B”
CEFD P/N CA/WR11002-1
DB-15 Alarm Interface
CEFD P/N CA/RF-5785-24
IF Cable (2 Places)
(2 Places)
CRS-120L
Figure 2-4. CRS-120L Typical Installation
2–5
1:1 Redundancy Switch Revision 3
Installation MN/CRS120.IOM
The following cable assemblies are available with the 1:1 redundancy switch as shown in the
preceding figure:
Qty Cable, P/N Remarks
CRS-120
2 CA/WR11002-2 Cable Assy, Alarms Interface
2 CA/BNC75OHM
REF KT/11084-3 CRS-120 Switch Kit (including cabling)
CRS-120L
2 CA/WR11002-2 Cable Assy, Alarms Interface
2 CA/RF-5785-24 CEFD, L-Band Cable
REF
KT/11362-3
CEFD, 75Ω IF Cable
CRS-120L Switch Kit (including cabling)
For CRS-120 Switch: The 1:1 redundancy switch is designed to work with 75Ω systems, and
Users should ensure that they order the correct IF cable sets.
For CRS-120L Switch: The 1:1 redundancy switch is designed to work with 50Ω systems, and
users should ensure that they order the correct L-Band cables.
The modulator connected to the J1A (top) connector of the 1:1 redundancy switch is recognized
as the A unit and the one connected to J1B is the B unit. When a modulator is plugged in and
detected the main menu of the front panel display automatically indicates whether the modem is
A or B.
It is essential to ensure that the IF connections, are made correctly, ie the TX IF from Unit ‘A’
connects to the TX IF port ‘A’ on the 1:1 redundancy switch, and Unit ‘B’ to ‘B’. Failure to
observe this requirement will result in the system malfunctioning.
When connecting the Alarms Interface cable between the 1:1 redundancy
switch and the modulators, please ensure that screw locks on the ‘D’ type
connectors are securely fastened. This will prevent the accidental un-
IMPORTANT
mating of the cable, particularly when a Standby unit is being removed or
replaced.
2–6
Chapter 3. CONNECTOR PINOUTS
3.1 External Modem Connections
The external connectors provide all necessary connections between the 1:1 switch and other
equipment. Refer to Figures 1-3 and 1-4 for appropriate connector locations.
Table 3-1. CRS-120 Connectors and Pin Assignments
Name Reference Connector Type Function
Alarm Interface, Top J1A 15-Pin D Sub/Female
Alarm Interface, Bottom J1B 15-Pin D Sub/Female
Online Status J2 9-Pin D Sub/Female
TX-IF MON J3 BNC Female
TX-IF Online J4 BNC Female
TX-IF Standby J5 BNC Female
TX IF A J6A BNC Female
TX IF B J6B BNC Female
Ground GND 10-32 Stud
Table 3-2. CRS-120L Connectors and Pin Assignments
Name Reference Connector Type Function
Alarm Interface, Top J1A 15-Pin D Sub/Female
Alarm Interface, Bottom J1B 15-Pin D Sub/Female
Online Status J2 9-Pin D Sub/Female
-20 dB MON J3 SMA Female
Online J4 SMA Female
Standby J5 SMA Female
TX IF A J6A SMA Female
TX IF B J6B SMA Female
Ground GND 10-32 Stud
3–1
1:1 Redundancy Switch Revision 3
Connector Pinouts MN/CRS120.IOM
3.1.1 Alarm Interface Pin Assignment, J1A, J1B
The Alarm connector is a 15-Pin D female type, with threaded jack nuts. The pinout depends
upon whether the unit is in the Normal or Redundancy mode.
Alarm A (J1A) or B (J1B) Connector
1:1 Mode (In Modulator)
Pin #
8
15
7
14
6
13
5
12
4
11
3
10 RS-232 OH Channel Input Tx Aux_RS232 O I
2 RS-232 OH Channel Output Rx Aux_RS232 I O
9 Ext Carrier Off EXT-OFF O O
1 Ground GND Gnd Gnd
Program Relay NC
Program Relay NO
Program Relay COM
Rx Fault (De-energized = Open = Fault)
Tx Fault (De-energized = Open = Fault)
Unit Fault (De-energized = Open = Fault)
Mod A/D
+12 VDC Output (160 ma)
AUX0 Out Enable to 1:N
Rx I Channel (Constellation Monitor)
Rx Q Channel (Constellation Monitor)
Note: Items shown (NC) are not connected inside the switch.
Description
Name
PR-NC
PR-NO
PR-COM
Rx_-NO
Tx_-NO
Unit_-NO
MODA2D
+12Vout
Tx_B_EN
Rx-I
Rx-Q
J1A
Direction
I/O
I/O
I/O
I/O
I/O
I/O
O
I
I
I
I
J1B
Direction
I/O
I/O
I/O
I/O
I/O
I/O
O
I
I
I
I
3.1.2 Online Status Connector Pin Assignments, J2
The Indicator connector is a 9-Pin D female type, with threaded jack nuts.
Pin # Description Direction
1 Ground I/O
2
3
4 B-NO (COM to NO, B is Online) I/O
5 A/B-COM I/O
6 A/B-NC (COM to NC, A is Online) I/O
7
8
9
3–2
1:1 Redundancy Switch Revision 3
↑
Connector Pinouts MN/CRS120.IOM
3.1.3 CRS-120 Only. TX-IF Connectors, J3, J4, J5, J6A, J6B
Ref Des Name Function
J3 Tx IF MON
-20 dB
J4 Tx IF Online Output, Online Carrier
J5 Tx IF Standby Output, Standby Carrier
J6A Tx IF A IF Input from Modulator A,
J6B Tx IF B IF Input from Modulator B
Output, monitors online carrier at
approximately –20 dB.
3.1.4 CRS-120L only. SMA Connectors J3, J4, J5, J6A, J6B
Ref Des Name Function
J3 -20 dB MON Output, monitors online carrier at
approximately –20 dB.
J4 Online Output, Online Carrier
J5 Standby Output, Standby Carrier
J6A Tx IF A Input from Modulator A,
J6B Tx IF B Input from Modulator B
3.1.5 Standby TX IF Out Switch
The switch is a 2-position Dip switch. This switch enables or disables the standby Tx Carrier
provided there is no fault that will normally disable the carrier.
(up position) Standby Tx carrier remains On
↓ (down position) Standby Tx carrier is forced Off.
3–3
1:1 Redundancy Switch Revision 3
Connector Pinouts MN/CRS120.IOM
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3–4
4.1 Introduction
Having connected the cables in accordance with the instructions and diagram specified in Section
2.0, the User is now ready to put the system into operational use. Before proceeding, the User
should check that the Alarm cable from each modulator to the 1:1 redundancy switch is
functioning correctly. From the front panel of the Online unit, access the main menu, and then
select Config: Aux: 1:1 Mode.
Chapter 4. OPERATION
Figure 4-1. Typical View of Modulator Front Panel
4–1
1:1 Redundancy Switch Revision 3
A
Remote Control Operation MN/CRS120.IOM
4.2 1:1 Operation
After the unit has been cabled in accordance with the instructions and diagram specified in
Section 3.0, the User is ready to initiate operational use. Before proceeding, the User should
check that the Auxiliary Serial link between the two units is functioning correctly. The opening
screen of the modulator indicates whether the modulator is the A or B unit.
CDM-710 Modulator A
Firmware Version X.X.X
The bottom line displays the internal software version. Press [ENTER] to go to the Main menu
screen.
Once the modulator is set up for proper operation, the character ‘A, B, or
?’ will appear in the display, when the unit is enabled for 1:1 operation to
IMPORTANT
From the front panel of the Online unit, access the Main menu, and then select
Config: Aux: 1:1 Mode.
designate the A or B modulator or ? to indicate a cable is most likely
disconnected.
Config: AUX: 1:1 Mode
The Aux: 1:1 menus are used to set up 1:1 operation with the 1:1 redundancy switch.
1:1 Mode: Ena/Dis
uto/Man Force ( E)
Config: AUX: 1:1 Mode: Enable / Disable
1:1 Enable/Disable:
Enable Disable ( E)
Selecting Enable sets up the unit for operation with the 1:1 IF switch. Internally an
auxiliary relay sets the alarms connector for the 1:1 operation mode. This permits the
modulator to automatically detect the presence of the 1:1 switch and determine if it is the
A (Online) or B (Standby) unit.
The Main menu indicates the A or B unit. If A or B is opposite of what is expected the
Alarm cables connecting the unit at the 1:1 switch are probably swapped. A ? appears in
4–2
1:1 Redundancy Switch Revision 3
A
M
Remote Control Operation MN/CRS120.IOM
the Main menu if 1:1 operation is enabled and the modulator cannot sense A or B status.
This usually indicates the cable is disconnected.
Config: AUX: 1:1 Mode: Switching
1:1 Mode Switching:
uto-(On) Manual-(Off) ( E)
Selecting Auto-(On) places the 1:1 switching in the automatic mode. The Manual-(Off)
mode disables automatic operation.
Config: AUX: 1:1 Mode: Force
Press ENT to Force Modem to Standby
(1:1 Only)
This menu allows forced switchover.
4.3 1:1 Remote Control Operation
From the front panel of the Online unit, access the Main menu, then select:
Config: Remote Control menu to set up the modulator for operation via the
remote port. Also refer to the Remote Operation section for commands and responses.
Setup for remote operation is as follows:
If RS485 was selected, the user will be further prompted:
RS485 Address:
odulator Switch
This menu allows selection of a Modulator address and Switch address. The Switch address is
used in conjunction with CRS-120 IF Switch in 1:1 applications where two modulators share the
switch controller function and drive the IF switch to place the A modulator or B modulator in the
Online or Standby positions.
Operationally, each modulator has a unique modulator address but their share a common switch
address.
4–3
1:1 Redundancy Switch Revision 3
Remote Control Operation MN/CRS120.IOM
If Modulator is selected, the user is further prompted:
RS485 Mod Address: 0001
(E)
Edit the RS485 Mod address of this modulator. This is accomplished by selecting the
digit to be edited, using the arrow keys. The value of the digit is then changed using
the arrow keys. The user should then press [ENTER]. The valid range of addresses
is from 1 to 9999.
If Interface was selected:
M&C Bus Interface: RS232
RS485-2W RS485-4W (E)
Select RS232 or RS485-2W (2-wire) or RS485-4W (4-wire) using the arrow keys,
then press [ENTER].
Note: At this point the user will be further prompted to enter the bus address.
4–4
Chapter 5. SUMMARY OF
5.1 Summary of Specifications
Note: Specifications for the CRS-120 and CRS-120L are shown in their respective tables.
SPECIFICATIONS
5–1
1:1 Redundancy Switch Revision 3
Summary Of Specifications MN/CRS120.IOM
5.1.1 CRS-120 Summary of Specifications
Table 5-1. CRS-120 Summary of Specifications
Description Requirements
Equipment Type 1:1 Redundancy Switch
Modulators Supported CDM-710 Satellite Modulator (70/140 MHz)
Operating Modes Fully automatic
Manual (via the front panel of the Online Modulator, or via the Modulator’s
remote control interface )
Architecture Continuous fault comparison of Online and Standby units.
Switchover only to an unfaulted unit
Switch Conditions Switchover initiated following: Unit faults or loss of Tx Traffic
Fault detection time 0.5 seconds maximum (time to detect a fault)
Switchover time Within 0.5 seconds of fault detection (time for relay to switch)
IF Frequency Range 52 - 176 MHz
(works with both 70 and 140 MHz Modulator IF options)
IF Impedance
IF Connectors BNC female
Return Loss 18 dB minimum from Tx-Online to the online Tx-A or Tx-B
Tx Insertion Loss 1.0 dB maximum, Tx-A or Tx-B to Tx-Online in low isolation position
Tx Sample -20 dB typical below Tx-Online signal
Tx Isolation 45 dB minimum Tx-A or Tx-B to Tx-Online in the high isolation position
Indicator Contacts 9 pin D female connector with Form-C contacts indicating A or B is Online
Indicator LED Two Green LEDs one indicates A Online the other indicates
De-Energized State With no power applied A is Online
Synchronization The Standby absorbs the configuration of the Online unit
Weight 1.1 lbs (0.5 kg)
Dimensions 1.7H x 7.64W x 4.11D inches
Power requirements 1.2 Watts maximum
Agency Approvals CE: emissions, susceptibility and safety
75 Ω
1.0 dB maximum Tx-A or Tx-B to the Tx-Standby in low isolation position
45 dB minimum Tx-A or Tx-B to Tx-Standby in the high isolation position
Contacts are 30 VDC at 1 Amp maximum
B Online
(1:1 mode enabled)
(4.3H x 19.4W x 10.4D cm)
See Section 1 for dimensional outline drawings.
+ 12 volts DC @ 100 mA (max)
(Power is supplied by the Online and Standby Modulators, and the unit
current shares when both an ‘A’ and ‘B’ unit are present. These power
supplies are electronically fused and protected.)
A single modulator has capacity to source the required current.
5–2
1:1 Redundancy Switch Revision 3
Summary Of Specifications MN/CRS120.IOM
5.1.2 CRS-120L Summary of Specifications
Table 5-2. CRS-120L Summary of Specifications
Description Requirements
Equipment Type 1:1 Redundancy Switch
Modulators Supported CDM-710 Satellite Modulator (L-Band)
Operating Modes Fully automatic
Manual (via the front panel of the Online Modulator, or via the Modulator’s
remote control interface )
Architecture Continuous fault comparison of Online and Standby units.
Switchover only to an unfaulted unit
Switch Conditions Switchover initiated following: Unit faults or loss of Tx Traffic
Fault detection time 0.5 seconds maximum (time to detect a fault)
Switchover time Within 0.5 seconds of fault detection (time for relay to switch)
IF Frequency Range 950 - 1750 MHz
IF Impedance
IF Connectors SMA female
Return Loss 18 dB minimum from Tx-Online to the online Tx-A or Tx-B
Tx Insertion Loss 1.9 dB maximum, Tx-A or Tx-B to Tx-Online in low isolation position
Tx Sample -20 dB typical below Tx-Online signal
Tx Isolation 45 dB minimum Tx-A or Tx-B to Tx-Online in the high isolation position
Indicator Contacts 9 pin D female connector with Form-C contacts indicating A or B is Online
Indicator LED Two Green LEDs one indicates A Online the other indicates B Online
De-Energized State With no power applied A is Online
Synchronization The Standby absorbs the configuration of the Online unit (1:1 mode enabled)
Weight 1.1 lbs (0.5 kg)
Dimensions 1.7H x 8.15W x 5.57D inches
Power requirements 1.2 Watts maximum
Agency Approvals CE: emissions, susceptibility and safety
50Ω
1.9 dB maximum Tx-A or Tx-B to the Tx-Standby in low isolation position
45 dB minimum Tx-A or Tx-B to Tx-Standby in the high isolation position
Contacts are 30 VDC at 1 Amp maximum
(4.3H x 20.7W x 14.1D cm)
See Section 1 for dimensional outline drawings.
+ 12 volts DC @ 100 mA (max)
(Power is supplied by the Online and Standby Modulators, and the unit
current shares when both an ‘A’ and ‘B’ unit are present. These power
supplies are electronically fused and protected.)
A single modulator has capacity to source the required current.
5–3
1:1 Redundancy Switch Revision 3
Summary Of Specifications MN/CRS120.IOM
5.2 1:1 Latching Operation
Table 5-3 explains two cases and how the health of 1:1 subsystem is monitored.
Event Mod A Mod B RF
Case 1
1 OK
(Online)
2 Fault OK B A Faults and B is OK, switches to B. Tx IF = B 3, 4, 9, 10
3 Fault Fault B Fault in A and B. Tx IF = None (carriers muted by both modulators). 3, 4, 9, 10
OK
(Standby)
Relay
A The online and standby units are designated. Tx IF = A 1, 2, 7, 8
Comments
Notes
4 OK Fault B Requires intervention. Tx IF = None (A is Standby and B carrier is
5 OK OK B Requires intervention. Tx IF = B. 3, 4, 9, 10
Case 2
6 OK
(Online)
7 OK Fault A A is OK and B Faults. Tx IF = A. 1, 2, 5, 6,
8 Fault Fault A Fault in A and B. Switchover to a failed unit is not allowed. Tx IF =
OK
(Standby)
muted by modulator).
A The online and standby units are designated. Tx IF = A 1, 2, 7, 8
None, and both carriers are muted.
3, 4, 9, 10
11, 12
1, 2, 5, 6,
11, 12
Notes:
Removal of the Alarm Cable while power is ON to both modulators:
1. Disconnecting the cable at A switches the B unit online and an alarm is reported.
Reconnecting the cable at A maintains the B unit online.
2. Disconnecting the cable at B keeps A online and an alarm is reported.
Reconnecting the cable to B keeps A online.
3. Disconnecting the cable at A maintains the B unit online and an alarm is reported.
Reconnecting the cable to A maintains the B unit online.
4. Disconnecting the cable at B maintains B online and an alarm is reported.
Reconnecting the cable to B keeps B online.
5. Disconnecting the cable at A maintains the A unit online and an alarm is reported.
Reconnecting the cable at A maintains the A unit online.
6. Disconnecting the cable at B keeps A online and an alarm is reported.
Reconnecting the cable to B keeps A online.
5–4
1:1 Redundancy Switch Revision 3
Summary Of Specifications MN/CRS120.IOM
Power OFF/ON to modulators while both Alarm cables connected:
7. Turning OFF power only to the A modulator switches the B unit online and an alarm is reported.
When power is returned to A the B unit stays online.
8. Turing OFF power only to the B unit maintains the A unit online.
Restoring power to the B unit maintains the A unit online.
9. Turning OFF power only to the A modulator maintains the B unit online and an alarm is reported.
When power is returned to A the B unit stays online.
10. Turning OFF power only to the B modulator maintains B online.
Restoring power to the B unit maintains B online.
11. Turning OFF power only to the A modulator maintains the A unit online.
Connecting power to the A unit maintains A online.
12. Turing OFF power only to the B unit maintains the A unit online.
Restoring power to the B unit maintains the A unit online
5.3 Tx Online Status Contacts
There are Form C indicator contacts that report whether A or B is online. These are “clean”
contacts that are not used by the modulator or switch. These are located on the front panel of the
CRS-120 Switch.
5–5
1:1 Redundancy Switch Revision 3
Summary Of Specifications MN/CRS120.IOM
This page is intentionally left blank.
5–6
METRIC CONVERSIONS
Units of Length
Unit
1 centimeter — 0.3937 0.03281 0.01094
1 inch 2.540 — 0.08333 0.2778
1 foot 30.480 12.0 — 0.3333
1 yard 91.44 36.0 3.0 —
Centimeter
Inch
Foot
Yard
Mile
6.214 x 10
1.578 x 10
1.893 x 10
5.679 x 10
Meter
-6
-5
-4
-4
0.01 — —
0.254 — 25.4
0.3048 — —
0.9144 — —
Kilometer Millimeter
1 meter 100.0 39.37 3.281 1.094
1 mile
1 mm — 0.03937 — — — — — —
1 kilometer — — — — 0.621 — — —
1.609 x 10
5
6.336 x 104 5.280 x 103 1.760 x 103
6.214 x 10
-4
—
— — —
1.609 x 103
1.609 —
Temperature Conversions
Unit
32° Fahrenheit
212° Fahrenheit
-459.6° Fahrenheit
° Fahrenheit
—
—
—
° Centigrade
0
(water freezes)
100
(water boils)
273.1
(absolute 0)
Formulas
C = (F - 32) * 0.555
F = (C * 1.8) + 32
Units of Weight
Unit
1 gram — 0.03527 0.03215 0.002205 0.002679 0.001
Gram
Ounce
Avoirdupois
Ounce
Troy
Pound
Avoir.
Pound
Troy
Kilogram
1 oz. avoir. 28.35 — 0.9115 0.0625 0.07595 0.02835
1 oz. troy 31.10 1.097 — 0.06857 0.08333 0.03110
1 lb. avoir. 453.6 16.0 14.58 — 1.215 0.4536
1 lb. Troy 373.2 13.17 12.0 0.8229 — 0.3732
1 kilogram
1.0 x 10
3
35.27 32.15 2.205 2.679 —
2114 WEST 7TH STREET TEMPE ARIZONA 85281 USA
480 • 333 • 2200 PHONE
480 • 333 • 2161
FAX
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