A site conferencing TV, local network appear the phenomenon that each meeting place access to meeting difficultly, and offline frequently. While has noise. MCU display each port has a large number of alarms.
Alarm views growth too fast.
1. The MCU port alarms views high, suspect transmission problem. Use BER tester to monitor transmission line error. Didn’t find bit error exist.
2. Suspect the port electrical performance, replace the port, replace the LIU veneer, can not solve the problem.
3. Check the MCU interface cable, shielded bad. Use crimping tool to re-suppress the interface cable, and each port error does not change any more. Re-open the console, bit error is zero.
The line shielding problem led to the high MCU port alarms views. Access meeting difficultly, and offline frequently.