Comtech EF Data DT-4500 Series, Инструкция по установке и эксплуатации

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DT-4500 Series C- and Ku-Band Down Converters MN/DT4500.IOM
Appendix A Revision 2
A–3
Options for the RSM include Type ‘SMA’ female connectors for the RF Input
signal, and 50 Ω or 75Ω BNC female connectors for the IF output.
The "Daisy Chain" configuration is designed to chain the IF output of up to twelve
(12) online converters through RSMs terminating in a BU. When a fault occurs in
an online converter, the system commands the RSM in the faulted converter to
switch to the BU.
A.3 Redundant Configurations
You may configure the DT-4500 in a variety of subsystem "Daisy Chain"
configurations to suit the reliability requirements of your communication
system. These configurations include 1:1 or 1:N Redundant Systems.
A.3.1 1:1 Redundant Systems
A 1:1 Redundant System can be either a Single Source or a Dual Source IF Output
Configuration.
In a Single Source IF Output Configuration: Figure A-1 shows the cable
connections between the converters. Figure A-2 shows the diagram for this 1:1
redundant converter configuration.
The online converter uses an IF transfer switch to switch the IF signal. A single
switched IF output is provided to and from the online converter. The transfer
switches are contained in the RSM installed in the online converter. When a fault
occurs in the online converter, the RSM is de-activated to switch out the online
converter, and switch the IF output to the BU.
In a Dual Source IF Output Configuration: Figure A-5 shows the cable
connections between the converters. Figure A-6 shows the diagram for the 1:1
redundant/dual source RF input/converter configuration.
Two IF outputs – IF Output #1 (priority) and IF Output #2 – are switched in the
RSM to provide redundant operation of the converters. The converters provide
two switched IF outputs – IF Output #1 (priority) and IF Output #2. If Converter
#01 faults, Converter #02 backs up the priority channel and IF Signal #2 is not
operational.