3Com USB/RJ-45 External Cable Modem DOCSIS 1.1 compliant / Supports VoIP (Voice Over IP) 56-bit Security Key Help Protect Data Privacy / Built-in protocol filtering Supports up to one computer over USB or 15 computers over a LAN Fast throughput capability: Up to 10 Mbps downstream, 3 Mbps upstream Fast average throughput: Up to 3 Mbps downstream, 1 Mbps upstream