Comtech EF Data SMS-758 - Manual (Page 115)

SMS-758 Modem Protection Switch Maintenance
MN/SMS758 Rev. 3 5–3
5.2 Fault Isolation
The following tables list the procedures for clearing fault indications in the fault menu or
the remote interface (remote interface messages are listed in parentheses).
The tables list the fault messages on the left and the procedures on the right. To clear the
fault or to determine why the fault remains, be sure to perform the steps in the order
listed.
5.2.1 Modulator Operation
Faults Procedures
BK-UP FAULT MOD X
(MOF_BU_OP_FLT_x) If no M:N faults exist:
Verify that the switch is in AUTO mode.
Verify that a backup modulator is available to backup all of the
faulted prime modulators.
Verify that the data cable between the switch and the modem
is connected to the correct connectors.
If an M:N fault exists:
Check M:N faults for communication, configuration, and
compatibility faults. If there are faulted primes that are not
backed up, the modulator operation fault display will remain
ON.