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Chapter 5 Troubleshooting
Table 5-1: Cable Configurations
RJ-11 FXS connectors are
used for modular
telephone and LAN
RJ-45 Ethernet connection
Table 5-2: Cables
Symptoms
• Intermittent signal with an
alarm.
• Front panel LED is Off.
Intermittent signal or power loss
with an alarm.
No FXS dial tone on line.
TC1920 Rev 1.3
User Manual
Possible Cause
The port is not working.
The cable has been damaged
internally.
The connector is damaged or the plug
is fouled with contamination.
Indications of damage to cable or
connectors.
Defective connector.
Defective telephone handset.
Mechanical
Actions
Try the following steps;
• Inspect for physical damage.
• Use A DVM to test the cable
signal output at the
connector.
• Replace the cable with a
known good cable.
b. Replace the cables.
Replace the cable.
Replace the unit and ensure
the is a dial tone.
5-4
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