光缆故障排查思路及解决方式
第一个问题：光缆的区别？1、外观2、传输距离3、波长4、芯径 第二个问题：两台交换机如何通过光缆进行互联？1、光缆（明确光缆的类型、长度）1、交换机2、光模块（明确光模块的类型、速率）3、光纤跳线 （明确跳线的类型、长度、速率）5、耦合器（明确耦合器的类型）6、尾纤（明确跳线的类型、长度、速率）7、光纤配线架或者光纤终端盒（明确具体的类型）第三个问题：上述两台交换机之间无法通信？1、交换机的带电状态---->交换机接口故障--->替换法2、接口状态-->down3、检查模块-->替换新模块或者现有正常使用--->4、检查跳线-->替换法5、更换光纤配线架上未使用的光纤接口--->替换法6、检查交换机收发功率--->1、查看交换机接口是否支持查看-->2、使用光功率计进行测试(测试范围，先打光后测试光)----> 7、耦合器对接线未插接牢固-->光缆熔接有问题8、光电复用口-->开启光口9、光接口协商速率问题
备注：查看接口光功率（光模块需被网络设备识别）run show interfaces diagnostics optics xe-2/1/1 //juniper网络设备dis transceiver diagnosis interface GigabitEthernet 1/0/14 //华三设备show intface gx/x transceiver //锐捷网络设备interface
例如：////////////华三网络设备///////////////////////dis transceiver diagnosis interface GigabitEthernet 1/0/14GigabitEthernet1/0/14 transceiver diagnostic information: Current diagnostic parameters: Temp.( Voltage(V) Bias(mA) RX power(dBm) TX power(dBm) 34 3.34 7.04 -5.96 -5.05 Alarm thresholds: Temp.( Voltage(V) Bias(mA) RX power(dBm) TX power(dBm) High 88 3.80 17.00 0.00 -2.00 Low -23 2.80 1.00 -16.99 -12.50 //////Juniper网络设备//////////////////admin@YiKaTong_DC-MX960# run show interfaces diagnostics optics xe-2/1/1 Physical interface: xe-2/1/1 Laser bias current : 34.130 mA Laser output power : 0.6870 mW / -1.63 dBm Module temperature : 21 degrees C / 70 degrees F Laser rx power : 0.9342 mW / -0.30 dBm Laser bias current high alarm : Off Laser bias current low alarm : Off Laser bias current high warning : Off Laser bias current low warning : Off Laser output power high alarm : Off Laser output power low alarm : Off Laser output power high warning : Off Laser output power low warning : Off Module temperature high alarm : Off Module temperature low alarm : Off Module temperature high warning : Off Module temperature low warning : Off Laser rx power high alarm : Off Laser rx power low alarm : Off Laser rx power high warning : Off Laser rx power low warning : Off Module not ready alarm : Off Module power down alarm : Off Tx data not ready alarm : Off Tx not ready alarm : Off Tx laser fault alarm : Off Tx CDR loss of lock alarm : Off Rx not ready alarm : Off Rx loss of signal alarm : Off Rx CDR loss of lock alarm : Off Laser bias current high alarm threshold : 80.000 mA Laser bias current low alarm threshold : 10.000 mA Laser bias current high warning threshold : 75.000 mA Laser bias current low warning threshold : 12.000 mA Laser output power high alarm threshold : 1.2580 mW / 1.00 dBm Laser output power low alarm threshold : 0.2230 mW / -6.52 dBm Laser output power high warning threshold : 1.1210 mW / 0.50 dBm Laser output power low warning threshold : 0.2510 mW / -6.00 dBm Module temperature high alarm threshold : 80 degrees C / 176 degrees F Module temperature low alarm threshold : -15 degrees C / 5 degrees F Module temperature high warning threshold : 75 degrees C / 167 degrees F Module temperature low warning threshold : -10 degrees C / 14 degrees F Laser rx power high alarm threshold : 1.2589 mW / 1.00 dBm Laser rx power low alarm threshold : 0.0100 mW / -20.00 dBm Laser rx power high warning threshold : 1.0000 mW / 0.00 dBm Laser rx power low warning threshold : 0.0158 mW / -18.01 dBm
////////////锐捷网络设备////////////////////To-Jiaoxuelou#show interfaces transceiver
========Interface GigabitEthernet 0/1========Transceiver Type : 1000BASE-LX-SFPConnector Type : LCWavelength(nm) : 1310Transfer Distance : SMF fiber -- 10km 50/125 um OM2 fiber -- 550m 62.5/125 um OM1 fiber -- 550mDigital Diagnostic Monitoring : YESVendor Serial Number : FNS172830XF
========Interface GigabitEthernet 0/2========Transceiver Type : 1000BASE-LX-SFPConnector Type : LCWavelength(nm) : 1310Transfer Distance : SMF fiber -- 10kmDigital Diagnostic Monitoring : NOVendor Serial Number : G1HD6B1022424
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