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UT-4500-A Series Upconverters Revision 1

Appendix B MN-UT4500A

B–3

B.3 Redundant Configurations

Comtech EF Data UT-4500-A Series Upconverters can be configured in several different

redundant subsystem "Daisy Chain" configurations to meet the reliability requirements of a

communication system. These configurations include:

• 1:1 Redundant Systems

o Single Source IF Input Configuration: The online upconverter uses an IF & RF transfer

switch to switch the IF input and RF output signals. A single switched IF input and RF

output is provided to and from the online upconverter. The transfer switches are

contained in the TSM installed in the online upconverter. When a fault occurs in the

online upconverter, the TSM is de-activated to switch out the online upconverter, and

switch the IF input and RF output to the backup upconverter. Figure B-1 depicts the

cable connections between the upconverters. Figure B-2 shows the block diagram of

this 1:1 redundant upconverter configuration.

o Dual Source IF Input Configuration: Two IF inputs – IF Input #1 (priority) and IF Input #2

– are switched in the TSM to provide redundant operation of the upconverters. The

upconverters provide two switched RF outputs – RF Output #1 (priority) and RF Output

#2. If Upconverter #1 faults, Upconverter #2 backs up the priority channel when IF Signal

#2 and RF Signal #2 are not operational. Figure B-5 depicts the cable connections

between the upconverters. Figure B-6 shows the block diagram of the 1:1 redundant,

dual source RF input, upconverter configuration.

• 1:N Redundant Systems

o IF and RF switches in the TSM are used to switch the IF input and RF output of a faulted

online upconverter to the backup upconverter. The IF input and RF output to the

redundant upconverter subsystem is connected to online upconverter #N. Figure B-7

depicts the cable connections between the upconverters. Figure B-8 shows the block

diagram for this 1:N redundant "Daisy Chain" upconverter configuration.

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