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Chapter 10
Fault Determination
Figure 10-3
Ports
More detailed information may be obtained through the Management Interface.
Checking Cables
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•
•
•
•
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OL-19276-01
Meanings of Status LED Indication
S3
S2
On
On
On
On
On
On
On
Off
On
On
On
Off
Off
Off
Check for continuity of both the inner conductor and the screen.
Check for short circuits between the inner conductor and the screen.
Check for correct attachment of connectors to cables.
Hold the cables firmly and move the connectors to and fro thoroughly. Then, recheck as above.
Check that the cables are 75 ohm and not 50 ohm. The centre pin diameter differs.
Perform local checks and ensure fault symptoms do not vary between them. If they do, a cable fault
is indicated.
S1
S0
Layer 1 is disabled
On
On
Loss of signal
Off
On
Layer 1 error detected other
than loss of signal,
Alarm indication signal is
not being sent
On
Off
Sending alarm indication signal
On
Off
Layer 3 is disabled
Off
Off
Layer 2 is misconfigured
Off
Off
Port is in loopback
On
On
Cisco VG30D Voice Gateway User Guide
Diagnostic Procedures
10-7
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