1) Log in to the LMT and then choose Alarm Maintenance > Browse Alarm. Then, view the Subrack No., Slot No., and Port No. in the alarm location information.
2) In the BSC equipment room, find the corresponding interface board according to the Subrack No. and Slot No.
3) Arrange an intact optical cable. Connect one end of the optical cable to the TX port of the interface board and the other end to the RX port of the interface board.