Comtech EF Data CLO-10 - Manual (Page 93)

CLO-10 Link Optimizer Revision 1
Redundant System Operation MN/CLO-10.IOM
Figure A-8 shows the functional block diagram of Bridge Mode. In this example, Traffic Unit #2
is being bridged and, as the figure shows, the only energized “baseball” switches are on Traffic
Unit #2.
A.4.2 Backup Mode Operation
Backup Mode is similar to Bridge Mode, with an added function: In Backup Mode, the Redundant
Unit completely replaces the Traffic Unit. More specifically, the Redundant Unit will now be
online, and the failed Traffic Unit will go offline. The output IF signal directed to the demodulator
is subsequently taken from the Redundant Unit.
Figure A-9 shows the functional block diagram of Backup Mode. In this example, Traffic Unit #2
is being backed up and, as the figure shows, all of the “baseball” switches are energized on the
IOSM on Traffic Unit #2.
Backup Mode can be done manually or automatically. In automatic mode, the Redundant Unit
will monitor all of the Traffic Units continuously. When a fault is detected on any of these active
Traffic Units, the Redundant Unit will first bridge the faulted unit, then back it up. When a
faulted Traffic Unit needs to be replaced, its IOSM can be separated from the Traffic Unit
chassis, leaving the active online Redundant Unit HSB Daisy Chain intact through the IOSM
switch module. The chain can be extended without affecting the online unit’s operation.
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