Understanding Pluggable Optical Modules
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Huawei optical module light attenuation value
Huawei optical module light attenuation can be checked by viewing the transmit (TX) and receive (RX) power through DDM/DOM commands on the switch or router interface.
Viewing Optical Module Information
To check light attenuation, you first need to view the optical module's real-time operating parameters:
- Use the command:
display transceiver [interface interface-type interface-number | slot slot-id]This displays general information about the optical module, including type, wavelength, connector, and digital diagnostic monitoring (DDM) support . - For detailed diagnostics, run:
display transceiver diagnosis interface [interface-type interface-number]This command shows TX power, RX power, temperature, voltage, and bias current, which are essential for evaluating optical attenuation .
Determining Light Attenuation
Optical attenuation is inferred by comparing the transmit power (TX) and receive power (RX) against the module's specifications:
- Check TX and RX power values: If RX power is significantly lower than expected, it indicates attenuation along the fiber link .
- Compare with optical budget: Ensure the measured RX power is within the module's rated transmission distance and power range .
- Use certified modules: Non-Huawei-certified modules may report incorrect power values or cause abnormal readings, so always verify module certification .
Troubleshooting Low or High Optical Power
- If TX power is low, try reinstalling the module or testing it in another port to rule out port issues .
- If RX power is low, check the fiber quality, connectors, and patch panels for excessive loss.
- Replace faulty modules or send them to Huawei for repair if abnormal readings persist .
Summary
- Run
display transceivercommands to view DDM/DOM parameters. - Check TX and RX power to assess attenuation.
- Compare readings with module specifications and optical budget.
- Use Huawei-certified modules to ensure accurate diagnostics.
- Troubleshoot by testing ports, fibers, or replacing faulty modules if necessary. By following these steps, you can effectively monitor and diagnose optical module light attenuation on Huawei switches and routers, ensuring stable and reliable optical links .
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