How Do I Query the Optical Modules Supported by Switches?

Transceiver Type               :1000_BASE_SX_SFP             //Optical module type
  Connector Type                 :LC                                            
  Wavelength(nm)                 :850                                           
  Transfer Distance(m)           :500(50um),300(62.5um)                         
  Digital Diagnostic Monitoring  :YES                                           
  Vendor Name                    :FINISAR CORP.                                 
  Vendor Part Number             :FTLF8519P2BNL-HW                              
  Ordering Name                  :                                              
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Manufacture information:                                                        
  Manu. Serial Number            :PEP3L5D                                       
  Manufacturing Date             :2008-12-05                                    
  Vendor Name                    :FINISAR CORP.                                 
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Alarm information:                                                              
RX loss of signal                                       //Loss of receiving signals
RX power low                                            //Low receive power
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Diagnostic information:                                                         
  Temperature(°C)                       :32                                     
  Voltage(V)                            :3.31                                   
  Bias Current(mA)                      :0.00                                   
  Bias High Threshold(mA)               :33.54                                  
  Bias Low  Threshold(mA)               :1.69                                   
  Current Rx Power(dBM)                 :-6.49                                  
  Default Rx Power High Threshold(dBM)  :0.00                                   
  Default Rx Power Low  Threshold(dBM)  :-16.99                                 
  Current Tx Power(dBM)                 :-50.00                                 
  Default Tx Power High Threshold(dBM)  :0.00                                   
  Default Tx Power Low  Threshold(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                                 
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An SFP+ optical module can interconnect with an XFP optical module. Two optical modules can interconnect with each other as long as their wavelengths, transmit power, and receive power meet interconnection requirements, regardless of their form factors.

A single-fiber bidirectional optical module uses one optical fiber to transmit and receive signals, and the transmit and receive wavelengths must match.

A multi-mode optical module cannot use a single-mode optical fiber. This is because a single-mode optical fiber is thin and may cause exceptions such as low optical power when it is used by a multi-mode optical module. A single-mode optical module can use a multi-mode optical fiber at a short distance, which is not recommended.

In the display transceiver command output, multiple transmission distances are displayed for a multi-mode optical module, as shown in the following figure.

The transmission distance supported by a multi-mode optical module varies according to the types of optical fibers used. The transmission distance is longer when OM3 optical fibers are used.

A port may be in Down state if the receive power of the optical module installed in the port is too low. If the receive power is too high, the receive optical bore of the optical module may be damaged. To prevent such damage, reduce the transmit power of the optical module on the remote port or use optical attenuators on the link between the local and remote ends.

1. Check whether an optical module is a bogus one. An optical module delivered by Huawei is uniquely identified by an SN. If two or more optical modules have the same SN, bogus optical modules are used.
2. Check whether the optical module is a Huawei-certified one. If not, replace it with a Huawei-certified optical module.
3. If the optical module is installed on a GE port, run the display interface GigabitEthernet x/x/x command to check information about the port, including the rate and wavelength. Check whether the information is consistent with the optical module specifications provided in the product documentation. (For details about the commands for querying port information, see the command reference of a specific switch model.)
4. Use an optical power meter to measure the receive power of the port.
5. Form a loop on the port using an optical fiber, and check whether the port can go Up (if optical modules with a long transmission distance are used, use optical attenuators.)
6. Check the configuration, such as auto-negotiation, of the remote port.
7. Take corresponding troubleshooting measures based on the fault causes. If the optical module is not a Huawei-certified one, replace it with a Huawei-certified optical module. If the optical module is faulty, replace it. If the fault is caused by incorrect configuration or networking environment, change the configuration or networking environment. If the fault persists, contact technical support personnel.

Use an optical power meter to measure the transmit power of the optical module. If the transmit power is much lower than the transmit power specification of the optical module, possible causes are as follows:

1. Optical bores of the optical module are contaminated. Use a cotton swab to clean the optical bores. Cover idle optical modules with dust plugs.
2. The laser transmission circuit of the optical module is faulty. If the fault persists, the optical module may be faulty. Contact technical support personnel.

1. Use an optical power meter to measure the transmit power of the optical module.
2. If the transmit power of the optical module is not in the normal range, replace the optical module.

1. Use an optical power meter to check whether the receive power of the optical module is in the normal range. The receive power must be measured at the receive end of the optical fiber.
2. If the receive power is too low, check whether the optical fiber is faulty. Possible causes include: The connector attenuation of the optical fiber exceeds the attenuation threshold, or the optical fiber is bent seriously.
3. Install another optical module on the port and check whether the fault persists. If not, the original optical module is faulty. Troubleshoot the optical module fault by referring to General Optical Module Troubleshooting Procedure.