Hi Shadow
OML Fault is generated when the OML is disconnected b/w BTS and BSC.Its a critical Alarm in Huawei.Although BTS reset automatically after 15 min if the issue persistent.u can also check these steps.
1).The transmission line is faulty,
2).The BTS has a power failure.
3).The TRX of the BTS is faulty.
pleasae can someone help me to explain what happen during mobile communicaton. how did the transmission take place. how does it related to the antenna, bts