BYTECC Model BT-555. Standards IEEE802.3, IEEE802.3u. Primary Ports 5 x RJ45, Primary Port Speed 10/100Mbps. Per Unit :Power, Collision Status, Per Port : Indications of LINK/ACT, Indications of COL/FDX, Power +6 Vdc @ 500mA Max. Dedicate uplink port, Support all major Network Operating Systems (NOS). LED per port for LINK/ACK status and trouble shooting. Collision LED display. USB power cable is 40 Inches from end to end. Dimensions 3.23" x 2.6" x 0.79".