Common Problem of Fiber Media Converter

If you know the common problem of fiber media converter, you can check the problem out by yourself.

1. Power light does not shine- Power failure

2. LOS lights must have the following breakdown:

(A) There is a broken cable from the engine room to the client;

(B) SC pigtail is not plugged in Media Converter slots or has been disconnected.

3.  Link light does not shine; the failure may be the following:

(A) Check whether the fiber optic lines breaker;

(B) Check whether the fiber line loss is too large, over a range of equipment receives;

(C) Check that the fiber optic interface is properly connected: local TX connects to remote RX; remote TX connects to local RX.

(D) Check whether the fiber optic connector is inserted into the device interface; whether the fiber patch cord matches with the device interface; device type matches with    fiber; whether the equipment transmission length matches the distance.

4.  Circuit Link light does not shine; the failure may be the following:

(A) Check whether the cable disconnection

(B) Check whether the connection type is match: network cards and routers and other devices use a crossover cable; switches, hubs, and other equipment use the straight line.

(C) Check whether the equipment transmission rate matches with the fiber media converter

5.  The serious network packet loss possible failure may be the following:

(A) The electrical port of media converter does not match with the network device interface; or the duplex mode of both ends of the device interface mismatch.

(B) Twisted-pair and RJ-45 connector is broken. Detect them.

(C) Whether the optical fiber connection jumper alignment device interface, pigtails and jumpers and coupler type matches.

6.  Fiber Media Converter can’t communicate after connecting both ends

(A) Fibres are reversed. The TX and RX are connected to the optical fiber reversely.

(B) RJ45 interface with external devices not connected properly (note that direct splicing)

Optical fiber interface (ceramic ferrule) do not match, this failure is mainly reflected in the transceiver 100M with optical mutual control function, such as APC ferrule pigtails received PC ferrule on the transceiver can’t communicate properly, but then non- the photoelectric interaction control transceiver has no effect.

Media Converter working Area

7. Unstable transmission

(A) The attenuation of optical link may be too large. At this moment, we can test the optical power of the receiving end by using an optical meter. 1-2dB in the vicinity of the scope of the receiving sensitivity range can be substantially determines the optical path failure

(B) Switch connected to the fiber converter may be failure. At this moment, to replace the switch with PC, which means two media converters connect directly with the PC, both ends of the PING. We can basically judge the switch failure, when the unstable transmission phenomenon appears.

(C) The fiber converter may be failure. At this moment, we can connect both ends of fiber media converter with PC (not through a switch). If the PING is no problem, transfer a larger file (100M) above from one end to the other end, observing the speed. If the speed is very slow (more than 15 minutes when the file is less than 200M), we can basically judge that the fiber media converter is failure.

8. Communication for some time after the crash, that means it can’t communicate back to normal after re-starting

This phenomenon is generally caused by a switch to switch on all data received CRC error detection and length check, check out the error packets will be discarded, the correct packet will be forwarded out. 

Some of the process error packets can’t be detected in the CRC error detection and length checksum this packet forwarding process will not be sent out, it will not be discarded, they will accumulate in the dynamic cache (buffer), can never be sent accumulation in wait until the buffer is full, it will cause the switch to crash the phenomenon. 

Because re-start the fiber media converter or re-start switch can make communication back to normal, so users often think that the problem of the fiber media converter.

Related Knowledge:

E1 to N x ETH Converter

TDMOIP N x E1 Converter

General Architecture of a Protocol Converter

Applications of Ethernet Fiber Media Converter

Link Fault Pass Through (LLP. LFP) function for media converters