Specifications

8-7
Cisco MGX 8260 Command Line Interface Guide
Release 1.2, Part Number 78-10987-01 Rev. B0, January, 2002
Chapter 8 Troubleshooting
Clearing Alarms
Clearing DS1/E1 and DS3 Alarms
The MGX 8260 Media Gateway supports DS1 and DS3 physical layer alarm signalling. To view current
DS1 alarm conditions, enter the lsds1lns command. To view current DS3 alarms, enter the lsds3lns
command.
The system lists a summary of line type, code, status, and signal code for each line. Use the Line Status
field and the following guidelines to clear an alarm.
EMM temperature alarm A temperature sensor raised an environmental alarm. Follow instructions
in the “Clearing Environmental Alarms” section on page 8-11.
EMM voltage alarm A voltage sensor raised an environmental alarm. Follow instructions in
the “Clearing Environmental Alarms” section on page 8-11.
Component failure alarm A hardware component of the card failed. Try the following possible
remedies:
• Reset the card and check to see if the alarm clears.
• Remove and replace the card.
Displayed Information Description
Displayed Information Possible Cause and Corrective Action
LOF A Loss of Frame alarm occurs when the MGX 8260 cannot synchronize
on frames. Try the following possible remedies:
• Verify that the framing format and clock settings for the line match
the port settings.
• Check the statistics for the line and look for abnormally high error
rates.
• If the line appears to have problems, use loopback tests to diagnose
the condition.
LOS A Loss of Signal alarm occurs when the MGX 8260 cannot detect a
signal at the line. Try the following possible remedies:
• Check for obvious physical cable damage, tight bends, or other
unusual conditions.
• If the line appears to have problems, use loopback tests to diagnose
the condition.
AIS An Alarm Indication Signal (0/1 pattern) occurs when the receive link
encounters problems for a set number of frames.
RDI A Remote Defect Indication occurs when the remote equipment
encounters problems for a set number of frames at that layer.
LOMF (E1 only) Check for framing format misconfiguration
Check for CRC bits errors in the frame
Check for line coding misconfiguration