The photoelectric converter failure is generally caused by the switch. The switch will perform CRC error detection and length check on all received data. It will check that the packet with the error will be discarded and the correct packet will be forwarded. However, some packets with errors in this process are not detected in the CRC error detection and length check. Such packets will not be sent during the forwarding process and will not be discarded. They will be accumulated in the dynamic cache. (buffer), can never be sent out, wait until the buffer is full, it will cause the switch to crash. Because restarting the transceiver or restarting the switch at this time can restore the communication to normal, the user usually thinks it is a problem with the transceiver.
Transceiver test method:
If you find a problem with your transceiver connection, test it as follows to find out the cause of the problem.
(a) Near-end testing
Both ends of the computer to PING, if you can PING通, then prove that the fiber transceiver is no problem. If the near-end test cannot communicate, it can be judged that the optical transceiver is faulty.
(b) Remote testing
If the computer at both ends is not connected to PING, if the PING is unreachable, it must check whether the optical path connection is normal and whether the transmitting and receiving power of the optical transceiver is within the allowable range. If PING is passed, it proves that the optical path is connected normally. You can determine that the problem is on the switch.
(c) Remote test to determine the point of failure
First connect one end to the switch, and both ends to PING. If there is no fault, it can be judged as failure of another switch.