PON设备故障定位指导

用户上网慢及ITV卡屏针对接入侧问题处理指导Huawei Technologies Co., Ltd.All rights reserved针对上网慢及ITV卡屏问题处理的思路如下：首先，在用户PC端进行网速测试，推荐使用迅雷同时下载文件，累积计算其速率是否满足要求；其次，可以在PC端ping测试网关设备，检查网络是否可达；最后若网络可达，在接入网层次上，可以进行下一步的排查：1 OLT下ONU无法上线及上网慢问题排查运行中ONU无法上线及下挂用户上网慢的原因较多，请按照如下所列举方式进行判断和恢复处理。

1.1 确认ONU是否掉电如果ONU下线原因为DyingGasp，或者历史下线告警为DGi下线，或者现场查看ONU没有上电，则是ONU掉电导致ONU无法上线。

需要对ONU上电1.1.1OLT上查看ONU下线原因是否为Dying gasphuawei(config-if-gpon-0/3)#display ont register-info 0 0---------------------------------------------------------------------Index : 1Auth-type : Sn-AuthSN : 3230313100000001Password : --TYPE : HG810EUpTime : 2008-9-2 11:22:23DownTime : 2008-9-2 11:24:56DownCause : ONT dying-gasp---------------------------------------------------------------------Total : 11.1.2OLT上查看ONU历史下线告警是否为Dgi下线huawei(config)#display alarm history alarmparameter 0/3/1 =>0/3/1为ONU所在端口1.1.3现场查看ONU是否上电如果有条件，请到ONU现场查看是否上电。

1.2 确认单板类型以及ONU故障数量确认单板类型和无法上线的ONU数量，便于后续针对性采取措施。

同一PON下个别ONU无法上线-----替换ONU同一PON下大量ONU无法上线-----进行下一步处理1.3 确认光模块是否存在问题光模块故障一般分为不发光或光模块类型插错。

MA5680T (config-if-gpon-0/1)#display port state 0---------------------------------------------------------------------------- F/S/P 0/1/0Optical Module status OnlinePort state OnlineLaser state NormalAvailable bandwidth(Kbps) 1231698Temperature(C) 42 <-光模块正常工作温度需小于70摄氏度，如果光模TX Bias current(mA) 4 块大于70摄氏度，建议排查客户环境散热情况Supply Voltage(V) 3.11TX power(dBm) 3.80 <-光模块发送光功率，如果此值为负数，说明光Illegal rogue ONT Inexistent 模块未发光。

Max rate(Kbps) 2500000 <-GPON光模块的下行最大波特率是2500000Max Distance(Km) 20Wave Length(nm) 1490Fiber type Single ModeSignal detect NormalTX fault NormalIdentifier SFPExt.Identifier GBIC/SFP function is defined by serial ID only Connector SCEncoding NRZ <-GPON光模块编码方式一般都是NRZLength(9um)(Km) 20.0Length(50um) Not supportLength(62.5um) Not supportLength(Copper) Not supportCc_base 0xa2CC_EXT 0xb5BR,max UnspecifiedBR,min UnspecifiedSFF-8472 Compliance Includes functionality described in Rev 9.4 Diagnostic Monitoring Type Digital diagnostic monitoringExtemally CalibratedPower measurement type: Average PowerOptions TX_DISABLE,and disables the serial outputTX_FAULTLOS(signal inverted from standard definition) Enhanced Options Alarm/warning flagsTX_DISABLE control and monitoringTX_FAULT monitoringVendor Rev UnspecifiedVender PN SPS4348HHPCDEVender SN A5R2008608Manufactured 10-04-28Vender name SOURCEPHOTONICSVendor OUI 0006b5Vendor specific 53 50 53 2d 34 33 2d 34 38 48 2d 48 50 2d 43 4445 20 20 20 20 20 20 20 20 20 00 00 00 00 00 00Module type -Module sub-type -Used type -Encapsulation type -1.3.1查询EPON 光模块情况MA5680T(config-if-epon-0/3)#display port state 0 ---------------------------------------------------------------------------- F/S/P 0/1/0Optical Module status OnlinePort state OfflineLast down cause LOSLast up time 2011-01-04 18:59:28+08:00Last down time 2011-01-04 21:30:35+08:00Laser state NormalAvailable bandwidth(Kbps) 1241152Temperature(C) 9TX Bias current(mA) 31Supply Voltage(V) 3.27TX power(dBm) 5.04Illegal rogue ONT ExistentMax rate(Kbps) 1300000 <-EPON光模块的下行最大波特率是1300000Max Distance(Km) 20Wave Length(nm) 1490Fiber type Single ModeSignal detect NormalTX fault NormalIdentifier SFPExt.Identifier GBIC/SFP function is defined by serial ID onlyConnector SCEncoding 8B10B <-EPON光模块编码方式一般都是8B10B Length(9um)(Km) 20.0Length(50um) -Length(62.5um) -Length(Copper) -Cc_base 0x97CC_EXT 0x91BR,max UnspecifiedBR,min UnspecifiedSFF-8472 Compliance Includes functionality described in Rev 9.4Diagnostic Monitoring Type Digital diagnostic monitoringExternally CalibratedPower measurement type: Average PowerOptions TX_DISABLE,and disables the serial outputTX_FAULTLOS(signal as defined in SFP MSA)Enhanced Options Alarm/warning flagsTX_DISABLE control and monitoringTX_FAULT monitoringVendor Rev UnspecifiedVender PN SPS43GBP2CDFCHWVender SN AC42001225Manufactured 10-11-06Vender name SOURCEPHOTONICSVendor OUI UnspecifiedVendor specific 20 20 20 20 20 20 20 20 20 20 20 20 20 20 202020 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20Module type -Module sub-type -Used type -Encapsulation Type - ----------------------------------------------------------------------------注意光模块类型时必须要max rate和encoding两项条件同时满足1.4 确认光线路是否存在问题通过查询ONT和PON口的收发光功率值，结合现网实际的光路组网计算出理论衰减值，对比实际值，如果差异大于3db，可能光路存在问题，需排查光路。

1.4.1查询ONT光功率情况MA5680T(config-if-gpon-0/5)#display ont optical-info <ponid> <ontid>---------------------------------------------------------------Rx Optical Power(dBm): -25.37 <-ONT下行光功率，即ONT接收OLT的光功率值RX power current Warning Threshold(dBm) : [-,-]RX power current Alarm Threshold(dBm) : [-,-]Tx Optical Power(dBm) : 3.15 <-ONT发送光功率TX power current Warning Threshold(dBm) : [-,-]TX power current Alarm Threshold(dBm) : [-,-]Laser Bias Current(mA) : 21TX bias current Warning Threshold(mA) : [-,-]TX bias current Alarm Threshold(mA) : [-,-]Temperature(C) : 46Temperature Warning Threshold(C) : [-,-]Temperature Alarm Threshold(C) : [-,-]Voltage(mV) : 3220Supply voltage Warning Threshold(mV) : [-,-]Supply voltage Alarm Threshold(mV) : [-,-]OLT Rx ONT Optical Power(dBm) : -27.78 <-OLT接收ONT的上行光功率值 CATV Rx Optical Power(dBm)注意前面5项参数，是OLT到终端上查询出来的值，需要对应的终端支持上报光模块信息且必须保证ONT正常上线。