Four steps to find the failure of the optical network

Look at Indicator of fiber-optic transceiver or optical module and the twisted pair port indicator is bright or not?

a ，such as the optical transceiver port (FX) indicator does not light, make sure that the fiber link is cross-linked? Fiber jumper is a parallel connection; the other end of the cross-connect.

b, A transceiver optical port (FX) light, B transceiver optical port (FX) indicator is not lit, the fault in the transceiver A-side: One possibility is that: the optical transmitter of the transceiver (TX)the mouth is bad, because the receiving optical signals B transceiver optical port (RX); Another possibility is: A transceiver (TX) port optical transmitter fiber link problems (cable or light jumper may off).

c,twisted pair (TP) indicator is not lit, make sure the twisted pair connection is wrong or connected wrong? Off tester checks; (However, some twisted pair transceiver indicator shall be fiber link connected after the bright)

d, the transceiver has two RJ45 ports: (To HUB) cable connected to the switch is a direct line; (To Node) connected to the switch of the cable is a crossover cable;

e, some hair side of the MPR switch: switch connection cable is a straight-line; DTE switch: switch connection cable is a cross-line.

(2) fiber optic cable, fiber patch cable is off?

a fiber optic cable through the off detection: laser flashlight, the sun, the luminous body facing the cable connector or a coupling according to the light; at the other end to see if there are visible?If visible light indicates that the fiber optic cable is not broken.

b, optical fiber connection off detection: laser flashlight, the sun, facing the fiber jumper, a phototherapy; see if there are visible at the other end? If visible light indicates that the fiber jumper is not broken.

Half / full duplex way is wrong?

Some transceiver side of the FDX switch: indicates full-duplex; HDX switch: that half-duplex.

With Optical Power Meter instrumentation

Under normal circumstances, the luminous power of fiber-optic transceiver or optical module: Multi-mode:-10db-18db between; 20 km single-mode:-8dB between-15db; 60 km single-mode:-5db-12db between; the luminous power of the fiber optic transceiver:-30db-5db between, you can determine this transceiver.