StarTech.com 1000BASE-BX MSA Compliant Downstream SFP Module - LC Connector - Fiber SFP Transceiver - Lifetime Warranty - 1 Gbps - Max. Transfer Distance 10 km (6.2 mi)The SFP1000BXDST is an MSA compliant downstream fiber SFP transceiver which pairs with StarTech. com's SFP1000BXUST. They are designed, programmed and tested to work with 1000BASE BX compatible MSA switches and routers. The SFP transceiver module supports a maximum distance of up to 10 km (6. 2 mi) and delivers dependable 1 GbE connectivity over fiber cabling. Delivers reliable 1 GbE connections for 1000BASE BX compliant networks StarTech. com SFP