Fail-Safe; Fault Relays - Comtech EF Data Radyne RCS11 Installation And Operation Manual

RCS11 1:1 Redundancy Switch

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.
MN-RCS11 – Revision 9
Theory of Operation
2–4