C-100MM-S1ST20D - Fast Ethernet Fiber to Fiber Media Converter Module 100BASE-FX 1310nm multimode (ST) [2 km/1.2 miles] to 100Base-BX 1550nm TX / 1310nm RX single strand fiber single mode (ST) [20 km
C-100MM-S1ST20D - Fast Ethernet Fiber to Fiber Media Converter Module 100BASE-FX 1310nm multimode (ST) [2 km/1.2 miles] to 100Base-BX 1550nm TX / 1310nm RX single strand fiber single mode (ST) [20 km