Comtech EF Data CPA - Manual (Page 131)

CPA C-Band Indoor Solid State Power Amplifier Revision 1
Appendix B MN/CPA-IN.IOM
B–9
B.3 Redundancy Operation
Figure B-7 shows the typical block diagrams for 1:1 and 1:2 redundant systems. Regardless of
which redundancy system is deployed, note the following:
Normal Operation
Incoming RF signals are routed through the Primary online ISSPA (for 1:1
systems), or ISSPA(s) (for 1:2 systems) to the system output(s) by the
combination waveguide/coax switch(es).
Controller Mode
With the Backup SSPA in the controller mode, it monitors the Online Unit(s) for
faults.
Fault
When a fault occurs in an Online Unit, the Backup SSPA automatically configures
itself with the settings of the faulted Online Unit. (These now-active settings have
also incorporated any user-defined offsets that may have been programmed into
the Backup Unit.)
Waveguide
The position of the waveguide/coax switch also changes automatically to route
the signal through the Backup Unit, thereby minimizing the loss of traffic.