MAC is an acronym for media access control. A MAC address is a series of letters and numbers that gives your equipment a unique identity on the Ethernet, or the local area connection. You might need to know your MAC address to add some services and devices to your computer. A MAC address is also referred to as a cable modem ID.
The Road Runner Help site lists modems approved for use with your Road Runner High Speed Internet service, including links to manufacturer websites. These websites provide user manuals and other documentation for the modems. Find out how to get there.
A wireless gateway combines the functions of a modem and a wireless router in one piece of equipment. It uses a signal transmitted on a combination of coaxial and fiber-optic cable to connect your computer to the Internet and to network your equipment wirelessly in the same way as a wireless router.