Overview
20 Block Up Converter Systems 6700/6900 series User Guide
How the redundancy controller works
When you power up the system, the redundancy controller
uses the current status of the BUC Switch and LNB Switch
(when used) to select the on-line stream.
When the redundancy controller is operating, it monitors the
two BUC and LNB (when used) streams for faults. When a
detectable fault occurs in the on-line BUC and LNB, and the
off-line BUC and LNB is serviceable, the redundancy
controller switches over the two streams. The interruption to
traffic is typically less than one second.
The redundancy controller switches:
• the receive IF signals between the LNBs (when used)
and the modem equipment
• the transmit RF signals between the BUCs and the
transmit antenna port
• the receive RF signal between the receive antenna port
and the LNBs (when used)
The transmit IF signal is not switched. Rather, a splitter allows
the transmit IF signal to feed both BUCs simultaneously. In
transmit-only systems, a transmit-only connector assembly is
supplied and fitted to the LNB Switch Control connector.
NOTE
If the redundancy controller detects that the
switches are inconsistent, or cannot be detected,
it selects Stream 1.
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