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Maintenance
Fault
NO MOD CONFIG LOADED
NO DMOD CONFIG LOADED
NO PRIMES ASSIGNED
PRIME NOT ASSIGNED
DATA SWITCH MODULE #1 to 8
or IF SWITCH MODULE
POWER SUPPLY #1 FAULT
POWER SUPPLY #2 FAULT
M&C CONTROLLER FAULT
I2C BUS FAULT
MU COMM FAILURE
NO ADDRESS FOR MU
5–4
Table 5-1. Switch Fault Analysis (Continued)
Description
No configuration for modulators in
memory.
No configuration for modulators in
memory.
Backup only.
Backup is enabled for switching with no
prime assignments.
Prime only.
Prime is enabled in switching algorithm
but has not been assigned a backup.
Set if module does not respond to
commands from the SCU, or responds
with error message.
Set when power supply voltage(s) are
out of tolerance.
Multiplexer fails to respond to switch
commands on the modem remote bus,
J2 of the SCU.
Address in configuration menu set to 0.
SMS-7000 Modem Protection Switch
Action
Reload modem configuration from
Load/Verify menu.
Reload modem configuration from
Load/Verify menu.
Disable backup in configuration
menu to OFF if not in use.
Designate prime assignments.
Disable prime in configuration menu
to OFF if not in use.
Designate backup assignment for
prime.
If error is for single module, replace
module. It is recommended that
power be removed from the switch
when changing a data switch
module.
If error is indicated by multiple
modules, check data switch interface
cable (J4) on rear of SCU and
control unit.
Replace faulted power supply
module.
Replace controller.
Replace controller.
Same as MODEM COMM
FAILURE.
Enter correct multiplexer address.
Rev. 3
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