Comtech EF Data RCS11 - Manual (Page 28)

RCS11 1:1 Redundancy Switch Theory of Operation
MN-RCS11 – Revision 9 2–4
2.4.3 Fail-Safe
If the RCS11 has a non-recoverable internal fault, the MOD and DEMOD both revert back to
Modem A, the Switch Fault LED is illuminated, and the Switch Fault Relay switches to a faulted
state.
If Power Supply 1 and Power Supply 2 simultaneously fail, the switching circuitry in the RCS11
reverts back to Modem A, and the Switch Fault Relay switches to a faulted state. Modem B does
not receive buffered signals in this condition.
2.4.4 Fault Relays
Fault Connector (J1), has Form-C contacts to indicate the state of the MOD and DEMOD
selections. An additional Form-C contact is available to indicate an RCS11 Fault.