Cisco VG30D, User Manual

Page: 91 / 118

10-7
Cisco VG30D Voice Gateway User Guide
OL-19276-01
Chapter 10 Fault Determination
Diagnostic Procedures
Figure 10-3 Meanings of Status LED Indication
More detailed information may be obtained through the Management Interface.
Checking Cables
•
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.
Layer 1 is disabled
Loss of signal
Layer 1 error detected other
than loss of signal,
Alarm indication signal is
not being sent
Sending alarm indication signal
Layer 3 is disabled
Layer 2 is misconfigured
Port is in loopback
Ports
On
On
On
On
On
On
Off
S3
On
On
On
Off
On
Off
Off
S2
On
Off
On
On
Off
Off
On
S1
On
On
Off
Off
Off
Off
On
S0
274466