Chapter 5 - Alarms and Handling
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The E1 interface is automatically connected by means of spanning; it is
necessary to replace the CMM module as soon as possible.
5.
Verification
The green PWR indicator of the CMM module is on.
6.
Precautions
This alarm is not reported to the BSC and can be viewed through the
LMT.
LAPD Long-Time Link Disconnection
1.
Description
The LAPD link is disconnected for a long time.
2.
Related information
Alarm code: None
Alarm level: 3
Alarm influence: The site cannot work.
Alarm unit location type: SITE
Internal handling flow: Alarm; request for the soonest replacement of
CMM.
3.
Cause
The communication between BTS and BSC is interrupted.
4.
Handling method
i.
Use the following flow to check whether it is the CMM board fault or
the transmission line problem.
¾
Use LMT to check whether the CMM version is correct;
¾
Disconnect the inlet and the outlet of E1 line at the BTS side to see
whether the red SYN indicator on the CMM panel is always on. If
not, it means that the CMM board has problem. Replace the CMM
board.
¾
Self-loop the E1 line at the BTS side, and check status of the red
SYN indicator on the CMM panel.
¾
If the red SYN indicator is always on when the E1 is self-looped,
replace the E1 interface line at the bottom. If it still does not work,
replace the CMM board.
¾
If the red STN indicator is not on when the E1 is self-looped, it
means that the BTS E1 inout/oulet is normal. Check whether the
transmission line (including the grounding) is in good condition.
ii.
If all devices are normal, check whether the software flow has any
problem with a signaling analyzer, and determine whether the
problem is at the BTS side or BSC side. Then, take further
measures as required.
5.
Verification
