... reservedwww.huawei.comInte rnal OME200301 GSM BTS Trouble Shooting ISSUE 3.0HUAWEI TECHNOLOGIES CO., LTD.Page 20All rights reservedCommon faults on uplinkDescriptionNo uplink signal BTS sensitivity ... weakenedPoor conversion quality, BTS coverage shrinkOn uplink signalNo uplink signal Calls cannot be established BTS sensitivity weakenedPoor conversation quality, BTS coverage shrinkFeeder ... the transmission device and BSC (or BTS) HUAWEI TECHNOLOGIES CO., LTD.Page 2All rights reservedReferencesM900/M1800 Base Station Subsystem Troubleshooting ManualM900/M1800 Base Station...