Comtech EF Data SMS-7000, Installation And Operation Manual

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SMS-7000 Modem Protection Switch Maintenance
Rev. 3 5–3
3. Replace the faulted modem with a properly functioning modem. Power up the
replacement modem, and configure the modem exactly as the faulted modem was
configured.
4. On the switch, turn on the modulator and demodulator for the modem that has
been replaced. Verify the replaced modem’s communication and configurations
from the Load/Verify menu.
Note: A no-system fault condition ensures that the modem was correctly
configured and is communicating to the switch. (See Table 5-1 for fault analysis,
if a fault exists.)
5. Set the switch operation mode back to Auto.
5.3.2 Switch
All faults reported in the switch fault menus (other than modem modulator and
demodulator faults) require corrective action to the switch or associated
interconnections.
Table 5-1 lists the switch faults along with brief descriptions of fault mechanisms and
checks/actions. If multiple faults occur, the common symptom listed in the “Action”
column will be the source of the fault.
Note: It is recommended that power be removed from the switch when changing out the
data switch modules.
Table 5-1. Switch Fault Analysis
Fault Description Action
MODEM COMM FAILURE Modem fails to respond to switch
commands on the modem remote bus,
J2, of the SCU. Verify modem agrees with switch
configuration.
If single modem failure, check
modem connector or modem.
If multiple modem failure, check
modem remote cable.
If all modem failure, check switch
connector or SCU.
MOD CONFIG VERIFY ERROR Results from inconsistencies between
configuration stored in switch and
configuration reported by modem. Reload modem configuration from
Load/Verify menu.
DMOD CONFIG ERROR Results from inconsistencies between
configuration stored in switch and
configuration reported by modem. Reload modem configuration from
Load/Verify menu.
NO ADDRESS FOR MODEM Address in configuration menu set to 0. Enter correct modem address.