User guide

Troubleshooting and repair
175
Analog phone troubleshooting
Table 9: Analog phone troubleshooting
Symptom Probable cause Corrective action
Unable to place calls
from an analog
phone.
Faulty connection at
the extension.
Ensure that the line cord is properly
connected to the wall and phone
sockets.
Replace the line cord.
Faulty programming. Verify that your number plan,
extension groups, and secondary
number plan are programmed
correctly.
See Modify the extensions and system
directory (p. 54).
Faulty phone. Replace the phone with a known
working phone of the same model to
determine if the phone is faulty.
Faulty connections
at patch panel.
Check the cable that connects the
3100 ICP ONS port to the patch panel.
Check the terminations.
Faulty wiring
between system and
phone.
Disconnect the extension cable from
the ONS port on the system and plug
a phone directly into the ONS port.
If the phone works when it is
connected directly to the ONS port,
check the building wiring, especially
for loose connections at terminations.
Faulty ONS module
or faulty controller
(two ONS ports are
provided by the
control board in the
system controller)
Power down the system. If the faulty
ports are on an ONS module, remove
and replace the suspect ONS module.
See Installing option modules (p. 133).
If the ONS ports are on the controller,
replace the controller.