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15.5dbm是多少毫瓦_:...

华为交换机S5700问题,

Jan 14 2014 18:51:28-05:13 Quidway %%01SRM/3/RXPOWER_EXCEEDMINOR(l)[21]:Optical module in interface GigabitEthernet0/1/4 exception, RX power too low. Jan 14 2014 18:51:48-05:13 Quidway SRM/4/OPTPWRRESUME:OID 1.3.6.1.4.1.2011.5.25.129.2.17.... Jan 14 2014 18:51:28-05:13 Quidway %%01SRM/3/RXPOWER_EXCEEDMINOR(l)[21]:Optical module in interface GigabitEthernet0/1/4 exception, RX power too low.
Jan 14 2014 18:51:48-05:13 Quidway SRM/4/OPTPWRRESUME:OID 1.3.6.1.4.1.2011.5.25.129.2.17.2 Optical module recovered from power abnormal.(EntityPhysicalIndex=67125518, BaseTrapSeverity=6, BaseTrapProbableCause=67697, BaseTrapEventType=9, EntPhysicalContainedIn=0, EntPhysicalName=GigabitEthernet0/1/4, RelativeResource=Interface GigabitEthernet0/1/4 optical module Rx Power, ReasonDescription=Rx power has resumed. The detail information is as follows: The current Rx power is NaNdBM; Set lower threshold is -18.99dBM; Set higher threshold is -3.00dBM.)
Jan 14 2014 18:52:09-05:13 Quidway SRM/3/OPTPWRABNORMAL:OID 1.3.6.1.4.1.2011.5.25.129.2.17.1 Optical module power is abnormal.(EntityPhysicalIndex=67125518, BaseTrapSeverity=5, BaseTrapProbableCause=67697, BaseTrapEventType=9, EntPhysicalContainedIn=0, EntPhysicalName=GigabitEthernet0/1/4, RelativeResource=Interface GigabitEthernet0/1/4 optical module Rx Power, ReasonDescription=Rx power is too low. The detail information is as follows: The current Rx power is NaNdBM; Set lower threshold is -18.99dBM; Default lower threshold is -18.99dBM)
Jan 14 2014 18:52:09-05:13 Quidway %%01SRM/3/RXPOWER_EXCEEDMINOR(l)[22]:Optical module in interface GigabitEthernet0/1/4 exception, RX power too low.
Jan 14 2014 18:52:30-05:13 Quidway SRM/4/OPTPWRRESUME:OID 1.3.6.1.4.1.2011.5.25.129.2.17.2 Optical module recovered from power abnormal.(EntityPhysicalIndex=67125518, BaseTrapSeverity=6, BaseTrapProbableCause=67697, BaseTrapEventType=9, EntPhysicalContainedIn=0, EntPhysicalName=GigabitEthernet0/1/4, RelativeResource=Interface GigabitEthernet0/1/4 optical module Rx Power, ReasonDescription=Rx power has resumed. The detail information is as follows: The current Rx power is -39.43dBM; Set lower threshold is -18.99dBM; Set higher threshold is -3.00dBM.)
Jan 14 2014 18:52:30-05:13 Quidway SRM/3/OPTPWRABNORMAL:OID 1.3.6.1.4.1.2011.5.25.129.2.17.1 Optical module power is abnormal.(EntityPhysicalIndex=67125518, BaseTrapSeverity=5, BaseTrapProbableCause=67697, BaseTrapEventType=9, EntPhysicalContainedIn=0, EntPhysicalName=GigabitEthernet0/1/4, RelativeResource=Interface GigabitEthernet0/1/4 optical module Rx Power, ReasonDescription=Rx power is too low. The detail information is as follows: The current Rx power is -39.43dBM; Set lower threshold is -18.99dBM; Default lower threshold is -18.99dBM)
Jan 14 2014 18:52:30-05:13 Quidway %%01SRM/3/RXPOWER_EXCEEDMINOR(l)[23]:Optical module in interface GigabitEthernet0/1/4 exception, RX power too low.

这个是怎么回事?怎么能取消这个?我把机器 还原了出厂配置还是出现这个,

已知光纤通信系统光纤损耗为0.6dB/km,有6个接头,平均每个接头损耗为0.15 dB,光源入纤功率为–4dBm,接

(52-4-6-6×0.15)/0.6=68.5公里
另:此题有问题,68.5公里怎么会只有6个接头?系统损耗怎么可能达到0.6dB/km?


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