Fiber optic network common failures and troubleshooting methods
the first, the light on the optical transceiver or optical fiber module and twisted-pair ports indicator is on
as the light of the transceiver ( 外汇) Light is not bright, please determine whether the optical fiber link cross link; Fiber optic jumper is parallel connection, On the other side is a cross connection. As the light of A transceiver ( 外汇) 'Light, the light of the transceiver (B 外汇) Light is not bright, the fault in A transceiver end: one possibility is that: A transceiver ( TX) Send light is bad, because the light of the transceiver (B RX) Receiving less than light signal; Another possibility is: A transceiver ( TX) Light mouth to send the fiber link has a problem, Cable may be broken or light jumpers) 。
fiber optic network common failures and troubleshooting methods 2
twisted-pair ( TP) Light is not bright, please make sure twisted-pair cable connections between any fault or wrong. Please use on and off the tester for testing; Some transceivers have two RJ45 port: ( 中心) Said connection switches connecting line is straight line; ( 节点) Said is connected to the switch line intersection line; Some hair side some MPR switch: it means the connection switches connecting line is straight line way; DTE switch: connection switches connecting line is crossing the line.
second, optical power meter instrument
optical transceiver or optical modules in normal circumstances the luminous power: multimode: - 10 db - - - - - - - Between 18 db. 20 km single-mode: - 8 db - - - - - - - Between 15 db. Single-mode 60 km: - 5 db - - - - - - - Between 12 db. If in the luminous power of the optical transceiver in: - 30 db - - - - - - - Between 45 db, then can judge the transceiver has a problem.
fiber optic network common failures and troubleshooting methods 3
third, half/full duplex mode is
some transceiver sides have FDX switch: full duplex; HDX switch: said half duplex.
4, fiber optic cable, fiber optic jumper has broken the
a and cable on-off detection: use laser flashlight, sunlight, light on one end of the cable joint or coupling according to light; In another first see if there is a visible light? If there is any visible light indicates cable did not break.
b, optical fiber connection on and off detection: use laser flashlight, the sun's rays on the one end of the fiber optic jumper, light; In another first see if there is a visible light? If there is any visible light shows that fiber optic jumper did not break.
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