20 km SFP WDM [bidi] 1G 20km SC / LC DDM GLC-BX-D GLC-BX-U 1310 1550 price-1pc

SFP 1G BiDi (WDM) 20km LC/SC DDM GLC-BX-D GLC-BX-U- 2 pc. They work on 10 km too

1G 3km SFP WDM bidi 3 km SC LC DOM DDM DDMi GLC-BX-D GLC-BX-U 1310nm/1550nm

Gigabit SFP Media Converter 1 SFP-2 RJ45 Transceiver 10/100/1000M Fiber Switch

10Gtek 1000Base-LX Gigabit SFP LC SingleMode Transceiver, Mini-GBIC Module for C

SFP 1G BiDi (WDM) 3km LC/SC DDM (DOM, DDMi) GLC-BX-D GLC-BX-U 1310nm/1550nm -2pc

SFP 1G BiDi (WDM) 20km LC/SC DDM (DOM, DDMi) GLC-BX-D GLC-BX-U - (pair)

SFP 1G BiDi (WDM) 3km LC/SC DDM (DOM, DDMi) GLC-BX-D GLC-BX-U 1310/1550 - (pair)