ZXG10 BS21 (V2.2) Compact Outdoor BTS for GSM Maintenance Manual
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phase-lock generation, check whether there is any out-of-lock
alarm.) If there is any fault, replace the ETRM module.
ii.
Observe whether the transmission link is normal, including whether
the transmitted clock is normal, whether the interface chip has any
alarm, and whether the error rate is too big.
iii.
Observe whether there is any alarm with the upper-level frame
number synchronization source.
5.
Verification
This alarm does not appear in the OMCR alarm interface.
6.
Precautions
None.
Receiving RF Local Oscillator PLL1~2 out
of Lock
1.
Description
Receiving RF local oscillator PLL1~2 are out of lock.
2.
Related information
Alarm code: 0X1C00, 0X1C01.
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.
Use the LMT to check whether there is any clock alarm. If any,
replace the related module. If none, check whether the TP interface
13 M clock on the front panel has 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.
