网络设备维修案例
设备型号：WS-C2960X-48FPD-L
一，故障现象：
1.客户反馈连接WS-C2960X-48FPD-L POE交接机23口AP设备供电异常且指示灯不亮 ，收到客户设备后开机自检正常，日志信息23口poe自动断开重启反复报错。
May 21 00:05:34.393: %ILPOWER-7-DETECT: Interface Gi1/0/23: Power Device detected: Cisco PD
May 21 00:05:35.078: %ILPOWER-5-POWER_GRANTED: Interface Gi1/0/23: Power grante
May 21 00:05:35.173: %ILPOWER-5-IEEE_DISCONNECT: Interface Gi1/0/23: PD removed
May 21 00:05:43.474: %ILPOWER-7-DETECT: Interface Gi1/0/23: Power Device detected: Cisco PD
May 21 00:05:44.134: %ILPOWER-5-POWER_GRANTED: Interface Gi1/0/23: Power granted
May 21 00:05:44.417: %ILPOWER-5-IEEE_DISCONNECT: Interface Gi1/0/23: PD removed
二，故障维修判定：
1.初步诊断为设备POE供电模块故障，拆开机器取下主板观察POE供电模块没有明显烧坏痕迹。
2.测量23端口对应poe控制芯片U3以及对应的mos管极内阻异常，栅极的阻抗不通电情况下只有0.029， 故障点为mos管有内部击穿现象。
3. 更换好的MOS管后再次测量mos管极内阻正常。
四，维修完成：
4. 装好机器开机测试故障解决，查看日志功能正常。
Compiled Thu 02-Jun-16 01:31 by prod_rel_team
May 20 23:52:23.267: %LINK-3-UPDOWN: Interface FastEthernet0, changed state to down
May 20 23:52:24.267: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0, changed state to down
May 20 23:55:05.698: %LINK-5-CHANGED: Interface Vlan1, changed state to administratively down
May 20 23:55:05.698: %LINK-5-CHANGED: Interface FastEthernet0, changed state to administratively down
May 20 23:56:27.257: %ILPOWER-7-DETECT: Interface Gi1/0/23: Power Device detected: IEEE PD
May 20 23:56:28.232: %ILPOWER-5-POWER_GRANTED: Interface Gi1/0/23: Power granted
May 20 23:56:37.092: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/23, changed state to up
May 20 23:56:38.095: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/23, changed state to up
May 20 23:56:57.047: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/23, changed state to down
May 20 23:56:58.053: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/23, changed state to down
May 20 23:57:00.968: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/23, changed state to up
May 20 23:57:01.971: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/23, changed state to up
May 20 23:57:04.852: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/23, changed state to down
May 20 23:57:05.851: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/23, changed state to down
May 20 23:57:08.770: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/23, changed state to up
May 20 23:57:09.769: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/23, changed state to up
Switch#
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