D-Link 331T/20KM/A1A / Interfaces: 1 port 1000Base-BX-D / Type of form factor: SFP / Connector: Simplex LC / Unidirectional / bidirectional: Bidirectional / Fiber optic cable support: Singlemode / Standards: IEEE 802.3z 1000Base-BX-D / Data transmission distance: 20 km (DEM-331T / 20KM); 40 km (DEM-331T) / Data transfer rate: 1.25 Gbit / s / 55.4 x 13.7 x 8.5 mm /