PLANET FT-806A20 is a Singlemode Single-Fibre WDM (SC) TX:1310nm Fast Ethernet Bridge 100BASE-FX Fibre to 10/100BASE-TX shielded twisted pair (STP) converter (WDM SC TX:1310nm, SM, 20km)* Additional FT-806B20 (WDM TX:1550nm, SM) is required to run as a pair and must connect to the FT-806A20It s..