The KSZ9031RNX is a completely integrated triple speed (10Base-T/100Base-TX/1000Base-T) Ethernet Physical Layer Transceiver for transmission and reception of data over standard CAT-5 unshielded twisted pair (UTP) cable.
RJ-45 Jack for Ethernet cable interface
Auto MDI/MDI-X for automatic detection and correction for straight-through and crossover cables