What is cable modem?
A cable modem is an external device that connects to your computer to provide high-speed data access via cable TV networks. Instead of getting an Internet connection through your telephone wire, you get a connection through your cable network (the same place your cable TV Connection comes from). It has two connections; one to the TV cable wire and the other to a computer. A Cable Modem sends and receives data to and from the Internet by using the existing coaxial cable network. The modem translates cable signals the same way a telephone modem translates signals from a telephone line. Cable modems translate radio frequency (RF) signals to and from the cable plant into Internet Protocol (IP), the communications protocol spoken by all computers connected to the Internet.
