The TFC-110S40D5 Bi-Directional Single-Strand Fiber Converter works with the TFC-1600 chassis system or as a standalone unit. This Dual Wavelength Single Mode SC Simplex type converter spans distances up to 40km (24.9 miles) and must be used with model TFC-110S40D3. Ports include 1 x 10/100Base-TX (RJ-45) port and 1 x 100Base-FX (SC Simplex Type) port.