Introduction of Optical Modules on Huawei Switches
Check Optical Module Parameters: If an optical module is installed in a running switch, you can run the display transceiver command
Huawei switch optical attenuation check
Huawei switches can check optical attenuation by querying the optical module's TX/RX power and DDM diagnostic information using display commands.
Using Display Commands
To check optical attenuation, you need to view the transmit (TX) and receive (RX) optical power of the module. Huawei switches provide commands to access this information:
- Display Transceiver Information Run the command:
display transceiver [interface interface-type interface-number | slot slot-id]This command shows detailed information about the optical module, including TX/RX power, wavelength, and module type . - Display Transceiver Diagnostics For more detailed monitoring, use:
display transceiver diagnosis interface [interface-type interface-number]This command provides Digital Diagnostic Monitoring (DDM) data, which includes real-time optical power, voltage, temperature, and current. The RX power can be compared with the expected TX power to calculate optical attenuation . - Check Interface Status Before interpreting attenuation, ensure the interface is operational:
display interfaceThe output shows link status, interface rate, and traffic statistics, which are prerequisites for accurate optical measurements .
Interpreting Optical Attenuation
- Optical attenuation is the difference between the transmitted power (TX) and received power (RX).
- Typical single-mode fiber attenuation ranges from 0.2 to 0.5 dB/km, while multimode fiber is higher.
- If RX power is significantly lower than expected, it indicates fiber loss, dirty connectors, or excessive distance .
Example Workflow
- Identify the interface with the optical module:
display interface brief - Query the module's TX/RX power:
display transceiver interface GigabitEthernet0/0/1 verbose - Calculate attenuation:
Attenuation (dB) = TX power - RX power - Compare with the module and fiber specifications to determine if the link is within acceptable limits . By following these steps, you can monitor optical attenuation, detect fiber issues, and ensure proper link performance on Huawei switches.
Analyzing the Optical Power
The optical power attenuates after being transmitted through the optical components or optical fibers. Normally, the actual
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Checking the optical attenuation of Huawei switches
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Checking the Working Modes
Replace the optical module or fiber. Check whether the optical module and fiber meet requirements. Use an optical
Checking the Working Modes
Check whether the optical module and fiber meet requirements. Use an optical power meter to measure the attenuation
Checking the optical attenuation of Huawei switches
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Displaying Optical Module Information
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