The Motorola SURFboard eXtreme Cable Modem SB6121 is a high-speed modem designed for home networking and connectivity. With a data transfer rate of 199.68 Mbps and a maximum downstream data rate of 172 Mbps, this modem offers fast and reliable internet access. It features an external black enclosure and is compatible with PCs. The modem also includes Ethernet and F-connector network ports, as well as a single LAN port for wired connection to a router or computer. With its DOCSIS 3.0 standard and hardware interface, this modem provides a stable and secure internet connection for your home or small office.