1) Complies IEEE 802.3u, 100Base-FX and 100Base-TX 2) Fiber connectivity up to 2km for multi-mode and 120km for single-mode 3) Utilizes WDM technology (models over 60km for single-mode fiber cable) to provide both Tx and Rx on a single fiber cable 4) ST or SC connector can accommodate single-mode size of 9/125um while MT-RJ or VF-45 connector is selectable 5) Two RJ-45 for straight or cross-over connection 6) Full-duplex, half-duplex or auto-duplex selectable 7) 6 diagnostic LEDs