This media converter comes with two 100BaseTX twisted pair ports and a 100BaseFX fiber optic port. The UTP ports have two RJ-45 connectors and a maximum distance of 100 meters. The fiber optic port has an ST, SC or MT-RJ connector and a maximum distance of 2Km (Multi-Mode Fiber) to 60km (Single-Mode Fiber). Fast Ethernet media converters operation mode (Half-/Full-Duplex) is solely depending on the Fast Ethernet devices connected to. Users do not have to configure it.