Optical İnvalid

1.Run the display transceiver slot slot-id verbose command in the system view to check whether the receive power Rx Power of the optical module is within the allowed range. If so, collect alarms, logs, and configurations, and contact technical support personnel.
2.If no alarm on low receive power is generated and the peer interface is Up, go to step 5.
3.If the peer interface is Down and an alarm on that is generated, rectify the peer interface.
4.Check whether the optical fiber is faulty. If so, replace the optical fiber.
5.Perform an external loopback test on the interface. If the interface is in Up state, perform loopback tests on the nodes along the transmission path to locate the failure point or link.
6.Replace the local optical module.
7.If the fault persists after the optical module is replaced, collect alarms, logs, and configurations, and contact technical support personnel.

Diagnostic information:
Temperature(°„C) :40
Voltage(V) :3.29
Bias Current(mA) :28.32
Bias High Threshold(mA) :90.00
Bias Low Threshold(mA) :2.00
Current Rx Power(dBM) :-15.64
Default Rx Power High Warning(dBM) :0.50
Default Rx Power Low Warning(dBM) :-14.40
Default Rx Power High Threshold(dBM) :2.50
Default Rx Power Low Threshold(dBM) :-16.40
Current Tx Power(dBM) :-3.37
Default Tx Power High Warning(dBM) :0.50
Default Tx Power Low Warning(dBM) :-8.20
Default Tx Power High Threshold(dBM) :2.50
Default Tx Power Low Threshold(dBM) :-10.20
User Set Rx Power High Threshold(dBM) :2.50
User Set Rx Power Low Threshold(dBM) :-16.40
User Set Tx Power High Threshold(dBM) :2.50
User Set Tx Power Low Threshold(dBM) :-10.20

Hello,
Run the display transceiver interface interface-type interface-number verbose command to view the optical module parameter settings.

All the parameters of each optical module must be within the acceptable range, especially the transmit and receive power.

The following measures can be taken if the optical power is abnormal:

• If the transmit power is too high or low, replace the optical module.
• If the receive power is too high or low:
  • Replace the optical module or fiber.
  • Check whether the optical module and fiber meet requirements.
  • Use an optical power meter to measure the attenuation of each part of links and recover the problematic link.
  • Check whether the transmit and receive fibers are correctly connected. Generally, two optical modules are connected by two fibers. The TX and RX ends of one module are respectively connected to the RX and TX ends of another module.

<HUAWEI> display transceiver interface GigabitEthernet 2/0/3 verbose

GigabitEthernet2/0/3 transceiver information:
-------------------------------------------------------------
Common information: 
Transceiver Type:1000_BASE_SX_SFP
Connector Type:LC
Wavelength(nm):850
Transfer Distance(m):500(50um),300(62.5um)
Digital Diagnostic Monitoring:YES
Vendor Name:HUAWEI
Vendor Part Number:02315204
Ordering Name:
-------------------------------------------------------------
Manufacture information:
Manu. Serial Number:NSK1NNV
Manufacturing Date:2014-11-09
Vendor Name:HUAWEI
-------------------------------------------------------------
Alarm information:
-------------------------------------------------------------
Diagnostic information:
Temperature(¡ãC):39
Voltage(V):3.32
Bias Current(mA):6.91
Bias High Threshold(mA):33.34
Bias LowThreshold(mA):1.67
Current Rx Power(dBM):-4.59         //Receive power
Default Rx Power High Threshold(dBM):0.00
Default Rx Power LowThreshold(dBM):-16.99
Current Tx Power(dBM):-5.10        //Transmit power
Default Tx Power High Threshold(dBM):0.00
Default Tx Power LowThreshold(dBM):-12.50
User Set Rx Power High Threshold(dBM) :0.00
User Set Rx Power Low Threshold(dBM):-16.99
User Set Tx Power High Threshold(dBM) :0.00
User Set Tx Power Low Threshold(dBM):-12.50
-------------------------------------------------------------              

from your diagnostic information, the current receive power(-15.64) is lower than the low warning threshold(-14.40).