
B–1
Appendix B. REDUNDANT
SYSTEM OPERATION
B.1 Introduction to Redundancy Operation
The Comtech EF Data UT-4500-A Series Upconverters are configured for redundant system
operation using distributed protection switching in an active "Daisy Chain" configuration.
Comtech EF Data's proprietary "Daisy Chain" configuration distributes the upconverter
protection switching functions in the upconverters. This provides a system capability to backup
from 1 to 12 online upconverters.
A High Speed Bus (HSB) provides the communications interface between the backup and online
upconverters to detect faults and reconfigure the subsystem to replace the failed upconverter.
When a faulted upconverter is removed from active operation, it is detached from the active
upconverter chain by separating the upconverter from its switch module, leaving the active
online upconverter chain intact through the switch module. The chain can be extended without
affecting the online upconverter operation.
The active "chained" upconverters in a redundancy subsystem can also be indirectly controlled
through the backup upconverter using the remote serial communication link – this capability is
discussed in Appendix A. REMOTE CONTROL.
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