Cisco GLCLHSMDST Gigabit Fiber Sfp Transceiver Module, FF Plug-in module, Connectivity Wired, Cabling Ethernet 1000Base-LH, Ethernet 1000Base-LX, Data Transfer Rate 1.25 GBps, Standards IEEE 802.3z, Interface 1 x Ethernet 1000Base-LX/1000Base-LH - LC female x 2, Silver. The GLCLHSMDST is a Cisco GLC-LH-SMD compatible fiber transceiver module that has been designed, programmed and tested to work with Cisco brand compatible switches and routers.