JTOPTICS® 1GBASE BD LR 20Km SFP optical transceiver, 1G SFP BD LR(JT 1G SFP BD LR) Bidirectional SFP transceiver is intended mainly for connecting high speed hubs, Ethernet switches, and routers together in different wiring closets or buildings using long cabling runs and developed to support longer length on fiber backbones. BIDI Transceiver used only one fiber to transmit and receive optical signal.It is mainly used in different applications such as router,media converter,switched backlane applications. Dual data rate of 1.25Gbps operation;1310nm FP laser and PIN photo detector for 20km Compliant with SFP MSA and SFF 8472 Duplex LC receptacle;Digital Diagnostic MonitoringInternal Compatible with SONET OC 24 LR 1Complied with RoHS..