ZXG10 BS21 (V2.2) Compact Outdoor BTS for GSM Maintenance Manual
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Confidential and Proprietary Information of ZTE CORPORATION
4.
Handling method
i.
Check whether there is any clock alarm through LMT. If yes,
replace the module concerned; if not, check the front panel TP
interface 13 M clock to see if there is any output. If there is no
output, the clock from TPU to RCU is faulty. Replace the ETRM
module.
ii.
If the above fault disappears, the local oscillator may be faulty.
Replace the ETRM in time.
5.
Verification
This alarm does not appear in the OMCR alarm interface.
6.
Precautions
This alarm should be handled immediately.
Transmitting IF Local Oscillator PLL Out of
Lock
1.
Description
The transmitting IF local oscillator PLL is out of lock.
2.
Related information
Alarm code: 0X1C05.
Alarm level: 3.
Alarm influence: This ETRM cannot serve calls.
Alarm unit location type: CU.
Internal handling flow: This ETRM is disabled.
3.
Cause
The clock signal is unstable, or the ETRM phase-locked loop is faulty.
4.
Handling method
i.
Check whether there is any clock alarm through LMT. If yes,
replace the module concerned; if not, check the front panel TP
interface 13 M clock to see if there is any output. If there is no
output, the clock from TPU to RCU is faulty. Replace the ETRM
module.
ii.
If the above fault disappears, the local oscillator may be faulty.
Replace the ETRM in time. The alarm handling varies depending on
the possible causes.
5.
Verification
This alarm does not appear in the OMCR alarm interface.
6.
Precautions
This alarm should be handled immediately.
