Troubleshooting guide

6-51
Cisco PGW 2200 Softswitch Release 9.8 Operations, Maintenance, and Troubleshooting Guide
OL-0800-14
Chapter 6 Troubleshooting the Cisco PGW 2200 Softswitch Platform
Troubleshooting Using Cisco PGW 2200 Softswitch Alarms
LIF LOF
This alarm occurs when a loss of T1/E1 framing is detected on the LIF. The physical line has a signal
but lost the framing pattern.
Corrective Action
To correct the problem, perform the following steps:
Step 1 To collect system data, see the method that is described in the “Collecting System Data for Cisco TAC”
section on page 6-93.
Step 2 Verify that the framing format used on the port matches the framing format that is used on the line.
If the framing formats are different, change the framing format on the port to the other framing format.
Otherwise, proceed to Step 3. If the alarm does not clear, proceed to Step 3.
Step 3 Change the line build-out setting. If the alarm does not clear, proceed to Step 4.
Step 4 Open the statistics report for the port and look for evidence of a bad line. Bursts of Latvia could indicate
a timing problem.
If you find evidence of a bad line, perform loopback tests on the line to isolate the problem. Otherwise,
proceed to Step 5. Once you have isolated the problem, resolve as necessary. If the alarm does not clear,
proceed to Step 5.
Step 5 Contact the Cisco TAC to analyze the problem further and to determine a solution. For more information
about contacting the Cisco TAC, see the “Obtaining Documentation and Submitting a Service Request”
section on page xviii.
LIF LOS
This alarm occurs when the sent signal is lost in the T1/E1. The receiving end does not receive the signal.
The physical line might have a break in it.
Corrective Action
To correct the problem, perform the following steps:
Step 1 To collect system data, see the method that is described in the “Collecting System Data for Cisco TAC”
section on page 6-93.
Step 2 Verify that the cable connections are correct between the interface port and the service provider
equipment or T1/E1 terminal equipment.
If the cable was built on-site, check the cable connectors. A reversal of send and receive pairs or an open
receive pair can cause this condition.
If the cable connections appear correct, then proceed to Step 3.
Step 3 Check your T1/E1 equipment, or ask your service provider to test your T1/E1 line and correct any errors
found.
If the alarm does not clear, then proceed to Step 4.