Check the optical module of the switch

You can check the optical module status, health, and diagnostics using CLI commands or web-based utilities to view metrics like Tx/Rx power, temperature, voltage, and module information.

Checking Optical Module on Cisco Switches

1. Verify Port and Module Status
   • Use show interface status to confirm the interface is up and connected.
   • Use show inventory to check if the switch detects the SFP module, including part number (PID) and serial number (SN) .
2. View Detailed Transceiver Information
   • Run show interfaces <interface-id> transceiver detail or show interface transceiver detail to see:
     • Tx Power (dBm) – strength of transmitted light
     • Rx Power (dBm) – strength of received light
     • Temperature (°C)
     • Voltage (V)
     • Laser Bias Current (mA)
   • This helps detect degraded performance or potential failures.
3. Check Module Identification
   • Use show idprom interface <interface-id> or show idprom transceiver extended to read EEPROM/vendor info, including module type, serial number, and compatibility .
4. Web-Based Utility (for SMB switches)
   • Log in to the switch's web interface.
   • Navigate to Status and Statistics > Diagnostics > Optical Module Status.
   • View port number, description, serial number, PID, temperature, and voltage .

Checking Optical Module on Huawei Switches

1. Display Module Information
   • Run display transceiver [ interface interface-type interface-number | slot slot-id ] [ verbose ] to view module details.
   • Use display transceiver diagnosis interface <interface-type interface-number> for digital diagnostic monitoring (DMM) metrics like optical power, temperature, voltage, and current .
2. Verify Compatibility
   • Ensure the module is Huawei-certified to avoid installation or data bus issues.
   • Check that local and remote modules have the same wavelength to prevent link failures .
3. Troubleshooting
   • If optical power is low or high, inspect fiber connections, clean or replace connectors, and verify fiber length .

Key Considerations

• Digital Optical Monitoring (DOM/DDM) is essential for real-time monitoring of optical health.
• Tx/Rx power thresholds should be compared with the module datasheet to ensure proper operation.
• Temperature and voltage readings indicate electrical and thermal health.
• Module compatibility is critical; using non-certified modules may cause link instability or hardware damage . By following these steps, you can effectively monitor, diagnose, and maintain the optical modules on your switch, ensuring stable network connectivity and early detection of potential issues.