E-link PoE Switche

Transceiver for a period of time after the crash

This phenomenon caused by the switch, the switch will CRC error detection andlength check on all the received data, check out the faulty packets will be discarded, the correct packet forwarding. But this process has some erroneouspackets in the CRC error detection and length check are not be detected, suchpackets are sent out in the forwarding process will never, never be discarded, they will accumulate in the dynamic cache (buffer), never sent, and to buffer piles up, willthe phenomenon of crashes caused by switch. Because the heavy transceiver orreset switches can make communication back to normal, so users are usuallyconsidered transceiver problem.

Transceiver lamp does not light

The fault may be as follows: (a) to check whether the circuit breaker fiber; (b) to check whether loss of optical fiber line is too large, exceed the range of receivingequipment; (c) check the optical interface is connected properly, TX and remotelocal RX connection, remote TX and local RX connection. (d) examination of optical fiber connector insertion device interface is intact, whether the jumper type matching with the device interface, whether the device type matching and optical fiber transmission equipment, whether match length and distance.

Transceiver network packet loss

(1) the electric port and the network device interface transceiver, duplex mode or both ends device interface mismatch. (2) the twisted pair has a problem with the head of the RJ-45, detection. (3) optical fiber connection problems, jumper isalignment device interface, pigtail and jumper and coupler type matching.

Fiber optic transceivers connect back ends cannot communicate?

1 optical fiber connected in reverse, TX and RX on the fiber; 2.RJ45 interfaceconnection with external equipment is not correct (note through and splicing),optical fiber interface (ceramic ferrule) does not match, this fault is mainly embodied with photoelectric mutual control function in the 100M transceiver, such as fiber ferrule connected to APC the PC transceiver can't be normal communications inserted core, but by non photoelectric mutual control transceiverno effect.

Transceivers connect test method

If it is found that the transceiver is connected with the problem, please testaccording to the following method, in order to find out the cause of the malfunction:

1 proximal ends of test: computer on PING, such as PING words that optical transceiver is no problem. Such as proximal test cannot communication can bejudged as optical fiber transceiver fault.

2 proximal ends of test: computer on PING, such as PING barrier must be checked for optical connection is normal and fiber optic transceiver for transmitting and receiving power is within the permitted range. If PING general proof light pathconnection. You can judge the fault problem in the switch.

3 remote test and fault point judgment: the end is connected with the switch, the two ends of the PING, if no fault can be judged as fault another switch.

Transceiver when the broken?

(1) for attenuation of light is too large, the available optical power meter optical power measurement receiver, if in the vicinity of the receiving sensitivity range, the range of 1-2dB can be judged as the basic optical path fault.

(2) may be switch fault connected with transceiver, the switch into PC, namely two transceivers connect directly with PC, the two ends of the PING, such as no instablephenomenon can be judged as the basic switch fault.

(3) for the transceiver fault, the transceiver ends (not by PC switch), are no problem for PING, transfer a large file from one end to the other end (100M) above,to observe its speed, if the speed is very slow (200M file transfer more than 15 minutes), can be the basic judgment for transceiver fault.