Cisco GLC-LH-SMD network transceiver module - GLC - SFP

The Cisco GLC-LH-SMD module can support a maximum transfer distance of 10,000 meters (10 km) over single-mode fiber.

It uses a dual LC/PC connector and is compatible with both multi-mode fiber (MMF) for shorter distances and single-mode fiber (SMF) for longer distances up to 10 km.

While it adheres to industry standards, Cisco SFPs are typically designed and tested for optimal performance within Cisco equipment. Compatibility with non-Cisco switches is not guaranteed and may require specific configurations or may not work at all.

Hot-swappable means you can install or remove the module from the network device while the device is powered on and operational, without causing network disruption.

This transceiver operates at a wavelength of 1300 nm.

You can typically use CLI commands such as 'show interfaces [interface-id] transceiver detail' or check the management interface of your Cisco device to view SFP status, including DOM information if supported.

Both standards operate at 1300 nm. 1000BASE-LX is designed for a shorter range on MMF and longer range on SMF, while 1000BASE-LH is optimized for longer distances on SMF, often exceeding the standard LX range.

Ensure the module is fully seated in the SFP port. Verify the module is a Cisco-compatible model for your specific switch. Try reseating the module or testing it in a different port.

Check that the fiber optic cable is securely connected at both ends (module and patch panel/destination device). Inspect the fiber cable for damage. Ensure the SFP module and the connected device are configured for the same speed (1000 Mbit/s) and duplex settings. Verify the fiber optic connectors are clean.

Confirm that the connected fiber optic cable meets the specifications for 1000BASE-LX/LH and the required distance. Check for excessive bends or damage in the fiber cable. Ensure the switch port is not experiencing errors or congestion.

Verify that DOM is enabled on the switch port. Ensure the switch firmware supports DOM for this SFP module. Consult the switch documentation for specific CLI commands to check DOM status.