BIDI GBIC, 1.25G, Optic module/Transceiver, Cisco compatible Features Dual data-rate of 1.25Gbps ... Description DW-S1253-40CG BIDI GBIC,1.25G,single fiber,1550/1310,SC,40km,0°C~+70°C ... DW-S1235-40CG BIDI GBIC,1.25G,single fiber,1310/1550,SC,40km,0°C~+70°C ... DW-S1253-20CG BIDI GBIC,1.25G,single fiber,1550/1310,SC,20km,0°C~+70°C ... C DW-S1235-03CG BIDI GBIC,1.25G,single fiber,1310/1550,SC,3km,0°C~+70°C ...