TRENDnet ADSL Fast Ethernet/USB Combination Modem Router TDM-C400 (Blue) LAN Interface: One 10/100 Base-TX Ethernet port, IEEE 802.3/3u, RJ-45 connector; One USB 1.1 device port, type B connector WAN Interface(ADSL line): One pair (2-wire) loop, 100 &#937; line impedance with RJ-11 connector; Compliance: ITU-T G.992.1 - USB (green LED) ?Continuous ON when USB is active; blinking while transmitting / receiving data