Some conference site was interrupted abruptly in a conference
1. There is poor soldering between the MUX board and DDF through 2M link.
2. There is too much bit error in the port of the optical transceiver.
Check the wire of 2M first. For the BNC port of the wire is always made in the field, it affects the transfer quality directly. And it is found there is nothing wrong with the physical connection. Then, do the advanced test and link test in the background with DDF and equipment room local loopback in the local end and equipment room local loopback in the far end. And it is found the status data of the solidification figure interface chip when equipment room local loopback in the far end was did is 55.1A…which indicates that the 2M port in the equipment room of the far end is in fault. Switch the port and reboot, the terminal can join the conference normally.
The high bit error rate between the MCU and each conference site or some factors affecting the transfer will make some conference site can’t join the conference.