Checking the optical port signal on a Huawei switch

Use Huawei commands like display transceiver and display interface to monitor optical port signals, RX/TX power, and transceiver status.

Viewing Optical Module Information

To check the optical port signal and transceiver details:

• All optical ports: Run display transceiver to view information for all optical modules on the switch, including type, connector, wavelength, transfer distance, and vendor details .
• Specific port: Run display transceiver interface to view details for a single port. Adding the verbose parameter shows receive (RX) and transmit (TX) power, temperature, voltage, and bias current . Example output includes:
• RX Power (dBm) – current received signal strength
• TX Power (dBm) – current transmitted signal strength
• High/Low thresholds for RX/TX power
• Temperature and voltage of the module

Checking Port Link and Status

• Use display interface to check link status, port rate, transceiver type, and traffic statistics.
• display interface brief shows a summary of all ports, including UP/DOWN status .
• UP indicates a normal link; DOWN may indicate a problem with the transceiver, fiber, or configuration.

Troubleshooting Optical Signal Issues

1. LOS Alarm (Loss of Signal): Indicates no inbound signal. Check the fiber connection and module compatibility. Use undo shutdown if the port is administratively down .
2. RX Power too low: May be caused by excessive distance, broken fiber, or faulty module.
3. RX Power too high: Could result from using a long-distance module on a short link; consider using an optical attenuator.
4. TX Power too low: Faulty or low-quality transceiver may cause packet loss or port down.
5. TX Power too high: Excessive signal may damage the receiving end; check module specifications .

Recommended Commands Summary

By using these commands, you can monitor optical port signals, detect abnormal RX/TX power, and troubleshoot transceiver or fiber issues effectively on Huawei switches .