SFP1000ZXST Compatible LC Single Mode Transceiver Module, Full Duplex. The SFP1000ZXST is a fiber SFP transceiver that’s designed, programmed and tested to work with 1000BASE-ZX compatible MSA switches and routers. The SFP transceiver module supports a maximum distance of up to 80 km (49.7 mi) and delivers dependable 1 GbE connectivity over fiber cabling.