ZXG10 BS21 (V2.2) Compact Outdoor BTS for GSM Maintenance Manual
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Confidential and Proprietary Information of ZTE CORPORATION
3.
Cause
The chip is faulty; the clock is abnormal; there is phase difference from
that of the BSC clock, or the E1 line is not connected securely.
4.
Handling method
i.
Check the electrical connection performance of the E1 cable.
ii.
If the E1 cable is in good condition, plug the module securely and
reset it.
iii.
If the alarm persists, the E1 interface chip may be abnormal.
iv.
If the chip self-test is passed, start the E1 interface self-loop test
flow.
v.
If the E1 interface self-loop test is normal, it can be basically
considered that the transmission equipment is faulty.
5.
Verification
This alarm does not appear in the OMCR alarm interface.
6.
Precautions
If the alarm does not appear frequently, it can be ignored.
Backward Slip Code Indication at
Receiving End of E1 Interfaces (A, D and
E Interfaces)
1.
Description
Negative slip code indication appears at the E1 interface receiving end
(in the A, D and E interfaces).
2.
Related information
Alarm code: 0X1A37, 0X1A4F, 0X1A57.
Alarm Level: 3.
Alarm influence: If it does not occur frequently, there is little influence
on the call. If it occurs frequently (once every few minutes), it can
cause abnormal conversation, or abnormal link establishment between
ETRM and BSC.
Alarm unit location type: SITE.
