ZXG10 BS21 (V2.2) Compact Outdoor BTS for GSM Maintenance Manual
76
Confidential and Proprietary Information of ZTE CORPORATION
1.
If the red SYN indicator on the CMM panel is on, it shows that the E1
line is broken or disconnected. To solve this problem, check the trunk
cable in the E1 interface at the bottom of the BS21 to see whether the
trunk cable is tightly connected and whether the contact is good.
2.
If the trunk cable in the E1 interface is aging, refer to “Trunk Cable
Replacement” for the specific method to replace the cable.
[
Recovery after test
]
None.
Checking Antenna Feeder Interfaces
[
Instruments and meters
]
None.
[
Test procedure
]
1.
Observe the indicators on the AEM module panel to see if there are
SWR1 and SWR2 alarms.
2.
Check whether the RF cable of the antenna feeder is aging.
[
Normal result
]
1.
The indicators on the AEM module panel show no sign of SWR alarms.
2.
The RF cable of the antenna feeder is not aging.
[
Troubleshooting
]
1.
With reference to the SWR measuring method in “Measuring SWR of
Antenna Feeder”, check the SWR of the jumper, the main feeder and
the antenna at the bottom of the equipment by sections and locate the
defective part; then replace the defective parts by referring to
Appendix A till the fault is removed.
2.
Replace the aging frequency cable with reference to “RF Cable
Replacement”.
[
Recovery after test
]
None.
Checking Whether Lightning Protection
Arrester is in Good Condition
[
Instruments and meters
]
1.
SiteMaster tester
2.
50 ohm N(F) matched load
3.
A testing cable
4.
An adapter N(M)-7/16 DIN(M), N(M)-7/16 DIN(F)
