Trunk or Station Module down
1. Run a Maintenance session to ensure that the Trunk Module is not disabled. See Module status on page 537.
2. Disable the module using the Maintenance heading Module status.
3. Enable the module using the Maintenance heading Module status.
4. For Trunk Module
Check the external line by terminating a single-line telephone directly on the distribution block, or equivalent, which connects to the Trunk Module.
5. For Station Module
If the Station Module is still down, power down, then power up the ICS.
If the problem persists
1. If AC power is present and the LED indicator on the Trunk Module is off, replace the Trunk Module.
2. Replace the fiber cable.
3. Replace the Trunk Cartridge.
4. Replace the Expansion Cartridge.
5. Replace the ICS.
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