Comtech EF Data SMS-758 - Manual (Page 114)

Maintenance SMS-758 Modem Protection Switch
5–2 MN/SMS758 Rev. 3
5.1.3 M:N Faults
An M:N fault occurs when a communication, configuration, setup, and/or power supply
failure occurs. The cause of the failure can be one of the following:
•
Modem communication failure due to incorrect:
! Address
! Baud rate
! Parity
! Interface connection.
•
Failure to verify configuration data.
•
Missing configuration data.
•
A backup modulator or demodulator that is not compatible with any prime.
•
A prime modulator or demodulator that is not compatible with any backup.
•
A missing modem address specification.
•
A missing modem interface specification.
•
A missing demodulator downlink specification.
•
High or low +12V power supply.
•
High or low -12V power supply.
•
High or low +5V power supply.
•
One of the power supplies is turned OFF or is inoperable.
5.1.4 Battery Faults
A BATTERY fault LED indicates that an M&C battery failure has occurred. A low
battery alarm indicates that the battery voltage is below its specified level, and that the
battery should be recharged or replaced. It does not necessarily indicate that memory
data will be lost if power is turned OFF, but it does indicate that data in the memory is
suspect, and should be checked.
After the battery is recharged or replaced, the switch may need to be reconfigured.