DEM-311GT-PCW is a 1000BASE-SX SFP Transceiver, generic for D-Link DEM-311GT. It is guaranteed compatible for all D-Link switch and router product lines. This transceiver can be mixed and deployed with D-Link OEM transceivers for seamless network performance and interoperability. PC Wholesale offers a LIFETIME advance replacement warranty on all transceivers (compared to 90 days from most OEM manufacturers).