ZXG10 BS21 (V2.2) Compact Outdoor BTS for GSM Maintenance Manual
134
Confidential and Proprietary Information of ZTE CORPORATION
6.
Troubleshooting
i.
Check the time when the alarm occurs and carefully observe
whether the minor alarm of the standing wave ratio occurs at the
same time. If yes, see whether the AEM needs to be replaced
considering fault may occur at the test circuit of the standing wave
ratio. If not, go on to the next step.
ii.
If permitted (in the case of little traffic or influence), remotely reset
the ETRM the AEM corresponds to at OMCR to see whether the
alarm will disappear, if not, go on to the next step.
iii.
If permitted (in the case of little traffic or influence), remotely reset
the BS (reset the CMM) to see whether the alarm will disappear, if
not, go on to the next step.
iv.
Go to the BS site to check whether the ETRM is contacted with the
backplane properly. After the fault is eliminated, go on to the next
step.
v.
Check if the panel indicator of the CMM module is normal; if not,
try to replace the CMM module.
vi.
Observe the level-1 alarm indicator of the SWR1 standing wave
ratio on the AEM panel. If it is on, check the standing wave ratio of
the jumper, master feeder and antenna from the combiner output
interface section by section until the reason why the standing wave
ratio is getting worse is found: Whether the connectors between
the set top hopper, master feeder and antenna are in poor contact
or the leakage from poor encapsulation. At last, consult Appendix A
to replace the faulty parts until the faults are eliminated.
7.
Precautions
None.
Poor Conversation Quality at BS
1.
Symptom
After the MS is powered on, it can find its network and the caller and
the called can both get through each other. But the voice quality is too
poor and distinct noises occur in the conversation.
2.
Source
Faults occur in dialing.
3.
Related parts
Wireless parameters of OMCR, the antenna feeder system, RF cable
and CMM modules.
4.
Analysis and locating
If the MS can make phone calls, it means the signaling channel is
normal.
Poor voice quality is caused by the high voice bit error at the wireless
interface, which is caused by low receiving level, clock faults or co-
channel interference. In the BS21 (V2.2) equipment, the conversation
