Check if the port has an optical module

You can verify recognition of an optical module by checking the port status, module information, and optical power levels through CLI commands or device management interfaces.Step 1: Verify Module Recognition via CLIHuawei devices: Use the display this interface or display interfaceGigabitEthernet x/x/x command to view port information. If the module is recognized, the output will show the module type, rate, wavelength, and whether it is certified. A certified module will display YES in the Certified field .Cisco devices: Log in to the switch console and use the show fiber-ports-optical-transceiver command. The output will display port number, temperature, voltage, current, transmitted (Tx) and received (Rx) optical power, and Loss of Signal (LOS) status. If the module is recognized, these fields will populate with valid readings .Step 2: Check Optical Power LevelsEnsure that transmit (Tx) and receive (Rx) optical power are within the module's specified range. Abnormal Tx power may indicate a faulty module, while abnormal Rx power may indicate issues with the peer device or fiber link .You can also use a handheld optical power meter to measure actual optical power for verification .Step 3: Confirm Port StatusCheck if the port is UP and transmitting/receiving data. Commands like show interface brief (Cisco/Huawei) can indicate whether the port is operational .If the port is not UP, verify rate and duplex settings on both ends, and ensure the fiber type matches the module (single-mode vs multimode), .Step 4: Troubleshoot if Not RecognizedReplace the optical module with a known working one to isolate the issue .Check the interconnection port configuration on the peer device, including auto-negotiation settings .Inspect the fiber for damage or improper connection, and test with a loopback if necessary . By following these steps, you can confirm whether the optical port has recognized the module and ensure proper operation of the fiber link.