Comtech EF Data SMS-7000 - Manual (Page 114)

Maintenance SMS-7000 Modem Protection Switch
5–2 Rev. 3
5. Replace cover and fasteners.
6. Install and interconnect switch controller in rack.
7. Reconnect power to switch.
8. Perform a hard reset under the Utility/System menu.
9. Enter desired switch configuration.
10. Load all modems from Load/Verify menu or remote terminal.
11. Resume Auto mode, as required.
5.3 Fault Action
Corrective action should be taken whenever a fault is indicated. This action will guard
against total switch failure and/or possible loss of service because of faulted prime
modems.
5.3.1 Modem
Modem modulator and demodulator faults are reported by the switch as part of the
overall configuration status. The details of modem faults are available from the
individual modem fault menus. Refer to the appropriate modem installation and
operation manual for corrective action.
To replace a faulted modem:
1. Disconnect power from the faulted modem.
Notes:
1. If the faulted modem is backed up by a backup modem in Dependent
mode, the backup modem will remain online without interruption of
service.
2. If the faulted modem modulator or demodulator is backed up by a backup
modem in Independent mode, disconnecting power will switch the
previously unfaulted side of the modem to an available backup modem.
2. Set the switch operation mode to Manual, then turn off the modulator and
demodulator of the faulted modem.