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How to measure optical attenuation on Huawei switches
Optical attenuation on Huawei switches can be measured by checking the transmit (TX) and receive (RX) optical power of the connected transceivers and calculating the difference.
Steps to Measure Optical Attenuation
1. Access the Switch CLI Log in to the Huawei switch via console, SSH, or Telnet. 2. Identify the Interface Determine the interface connected to the optical link. You can list all interfaces using:
display interface brief
This shows port types, link status, and basic statistics . 3. Check Optical Module Information Use the following command to view detailed transceiver parameters, including TX and RX power:
display transceiver interface
This command provides digital diagnostic monitoring (DOM) data such as transmit power, receive power, temperature, voltage, and current . 4. Interpret TX and RX Power
- TX Power: The optical power emitted by the transmitting module.
- RX Power: The optical power received at the other end of the fiber. Typical SFP module ranges are documented in the module datasheet. For example, a 10G-LR module may have TX power between -3 dBm and +3 dBm, and RX sensitivity down to -14 dBm . 5. Calculate Optical Attenuation Optical attenuation (link loss) can be estimated as:
Attenuation (dB) = TX Power (dBm) - RX Power (dBm)
Compare the measured attenuation with the expected link budget for the fiber type and module to ensure the link is within acceptable limits . 6. Optional: Use Extended Diagnostics For more detailed analysis, you can run:
display transceiver diagnosis interface
This provides additional diagnostic information and can help identify if the attenuation is due to fiber loss, connector issues, or module degradation .
Tips and Best Practices
- Ensure you are using Huawei-certified optical modules to guarantee accurate readings and reliable operation .
- Check for alarms or warnings in the DOM output, which may indicate excessive attenuation or module faults.
- Regularly monitor optical power to detect gradual degradation in fiber links. By following these steps, you can effectively measure optical attenuation on Huawei switches and maintain optimal fiber link performance.
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