A–1
Appendix A. REDUNDANT
SYSTEM OPERATION
A.1
Redundancy Overview
Use of the word “converter” throughout this appendix applies to either
the Comtech EF Data DT-4500 Series C- or Ku-Band Down Converter or
the UT-4500 Series C- or Ku-Band Up Converter.
Comtech EF Data’s DT-4500 Series C- and Ku-Band Down Converters function in a
redundant system using distributed protection switching in an active "Daisy
Chain" configuration. This proprietary configuration distributes the converter
protection switching functions in the converters. This provides a system
capability to back up from 1 to 12 online converters.
A High Speed Bus (HSB) provides the communications interface between the
backup and online converters. The HSB detects faults and reconfigures the
subsystem to replace the failed converter. When a faulted converter is removed
from active operation, it detaches from the active converter chain by separating
the converter from its switch module. This leaves the active online converter
chain intact via the switch module. You can expand the chain without affecting
online converter operation.
You may also indirectly control the active chained converters in a redundancy
subsystem through the backup converter (BU) via the remote serial
communication link – see Chapter 8. SERIAL INTERFACE OPERATION for more
information.
