Check whether the transmissions at the near-end BTS3002C are normal

If the "Sub No." is 0 and the BTS3002C works in the E1 transmission mode, perform a loopback test on ports RX0 and TX0 of the BTS3002C. If the "Sub No." is 0 and the BTS3002C works in the optical transmission mode, perform a loopback test on the westward optical ports of the BTS3002C. After that, check whether the LIU indicator in the maintenance cavity is off.

If the "Sub No." is 1 and the BTS3002C works in the E1 cascading mode, perform a loopback test on ports RX1 and TX1 of the BTS3002C. If the "Sub No." is 1 and the BTS3002C works in the optical transmission cascading mode, perform a loopback test on the eastward optical ports of the BTS3002C. After that, check whether the alarm is cleared.