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) According to the Port No., identify the DB44 port of the interface board and the E1/T1 cable on the port.
4) At the other end of the E1/T1 cable, identify the RX and TX ends of the port according to the Port No. and the label on the E1/T1 cable. Then, fasten the RX and TX ends.