StarTech.com GLCSXMMDST Cisco GLC SX MMD Compatible SFP Module - 1000BASE-SX Fiber Optical Transceiver - GLCSXMMDST

The StarTech.com GLCSXMMDST is a Cisco GLC-SX-MMD-compatible 1000BASE-SX SFP transceiver for network teams connecting Gigabit Ethernet equipment over multimode fiber, with an LC duplex connector and a maximum reach of 550 m.

Recommended For

• Network technicians replacing or adding a 1GbE optic in a Cisco-compatible switch or router with an SFP port, when the device accepts third-party Cisco-compatible modules. A hands-on test found this model was recognized and operated in a Cisco Catalyst 2960G and a Meraki switch.
• IT teams connecting switches or other SFP-equipped network devices over existing duplex multimode fiber, when the link needs Gigabit Ethernet rather than 10GbE. The supported reach depends on the fiber type and link conditions.
• Installers reusing multimode fiber with duplex LC connectors for a short- or medium-reach LAN link, such as between network closets, after confirming the equipment and fiber meet the 1000BASE-SX requirements.
• Network operators who want digital diagnostics from a compatible device to help check optical-link conditions; this module supports DDM/DOM, though availability of readings depends on the host equipment.

Real-World Use Scenarios

• Link two switches across floors or between nearby network closets over installed multimode fiber; the switches can carry a 1GbE uplink without extending copper Ethernet between them, provided both ends use compatible 1000BASE-SX optics and the fiber run is within range.
• Replace a failed or damaged Cisco-compatible SFP in a switch or router that already uses 1000BASE-SX multimode fiber; matching the host’s SFP requirements and the existing fiber connection can restore the link without replacing the cable run.
• Connect a fiber link to a copper-only device through a compatible media converter; the transceiver can serve on the converter’s fiber side, allowing the device to join an existing multimode fiber network over a supported 1GbE link.
• Extend a wired network to a remote segment in the same site where multimode fiber is already installed; this is useful when a copper run is impractical, as long as the link stays within the supported fiber distance and both connected ports match the optic type.
• Keep a compatible spare available for network maintenance; its hot-swappable design lets an IT technician replace the module at the port, helping limit disruption compared with replacing the switch or rerouting the fiber.

Spec Summary