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 50Ω 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.
To Next Page
Loading...
