You can find the following fiber-optic network failure

1, the first look at fiber-optic transceiver or optical module and the twisted pair port LEDs light has been lit?

a, such as optical transceiver interface (FX) indicator does not light, determine whether the cross-linked fiber link? A side of the fiber jumper is connected in parallel; B-side is the cross-connect.

b, such as the A-side optical transceiver interface (FX) indicator lights, B-side optical transceiver interface (FX) indicator is not lit, then the fault in the A-side transceiver:One possibility is: A-side transceiver (TX) optical transmitter port is bad, because the B-side optical transceiver (RX) to receive optical signals; Another possibility is: A-side transceiver (TX) optical transmitter the mouth of the fiber link with this problem (or light jumper cable may be broken).

c, twisted pair (TP) indicator is not lit, make sure the connection is wrong or twisted-pair connection is wrong? Please use the continuity tester testing;(However, some twisted pair transceiver such as optical fiber link to be connected to light after the light, see the website of the IMC optical transceiver Commissioning Manual)

d, some transceiver has two RJ45 ports: (To HUB) that the cable connecting the switch is a direct line; (To Node) said that the cable connecting the switch is a cross-line;

e, and some have MPR switch the transceiver side: that the cable connecting the switch is a direct line mode; DTE switch: switch cable is connected cross-line.

2, cable, fiber optic jumper has broken?a, fiber-off detection: laser flashlight, sun, light facing the cable end connector or coupling according to the light; at the other end to see if there is visible light? If visible light indicates that the cable is not broken.b, optical connections off detection: laser flashlight, sun, light front end illumination optical fiber jumper; at the other end to see if there is visible light? If there is no visible light indicates that the fiber jumper off.

3, half / full duplex mode is wrong?Some of the side FDX switch the transceiver: indicates full-duplex; HDX switch: that half-duplex.