SFP1000EXST Compatible LC Single Mode Transceiver Module, Full Duplex. The SFP1000EXST is a fiber SFP transceiver that’s designed, programmed and tested to work with 1000BASE-EX compatible MSA switches and routers. The SFP transceiver module supports a maximum distance of up to 40 km (24.8 mi) and delivers dependable 1 GbE connectivity over fiber cabling.