Huawei switch port optical power

You can view and monitor Huawei switch port optical power using commands like display transceiver or display interface, which show TX (transmit) and RX (receive) power along with thresholds for troubleshooting.

Viewing Optical Power

To check the optical power of a specific port or all optical ports on a Huawei switch:

• All ports: Run display transceiver to list all optical modules and their parameters, including TX and RX power, wavelength, and vendor information .
• Specific port: Use display transceiver interface to view detailed information for a single port. Adding the verbose parameter provides TX and RX power readings in dBm, along with high and low thresholds .
• Alternative command: display interface or display interface extensive can also show link status, transceiver type, and traffic statistics, which is useful for fault analysis .

Understanding TX and RX Power

• TX Power (Transmit): The optical power sent from the switch port. If TX power is too low, it may indicate a faulty or low-quality transceiver. If too high, it can damage the receiving device or indicate a misconfigured long-distance module .
• RX Power (Receive): The optical power received by the switch port. Low RX power can cause link failures or packet loss, often due to excessive distance, fiber damage, or incorrect module type. High RX power may require an optical attenuator to prevent damage .

Typical Thresholds

• Each optical module has default high and low thresholds for TX and RX power. For example, an SFP module may have:
  • RX Power Low Threshold: -16.99 dBm
  • RX Power High Threshold: 0 dBm
  • TX Power Low Threshold: -9.50 dBm
  • TX Power High Threshold: 0 dBm
• Values outside these thresholds trigger alarms or warnings, which can be checked using display transceiver or display interface.

Troubleshooting Tips

1. Check module certification: Ensure the optical module is Huawei-certified; non-certified modules may cause inconsistent power readings .
2. Inspect fiber and connections: Verify fiber integrity and proper LC/SC connectors.
3. Loopback test: Form a loop on the port with an optical fiber to test if the port can go UP; use attenuators for long-distance modules .
4. Check configuration: Ensure auto-negotiation and port settings match the module specifications.
5. Replace faulty modules: If TX/RX power is abnormal and the module is certified, consider replacing it .
6. Software updates: Upgrading the switch OS may resolve persistent issues affecting optical power readings . By regularly monitoring TX and RX power and comparing them to module thresholds, you can maintain stable optical links and quickly identify potential faults on Huawei switches.