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Broadband and internet service terminology:

cable modem

A cable modem is a networking device that connects to a standard cable television line. Computers connected to cable modem have a continuous or "always on" connection to the Internet. A cable modem is typically an external device, but there are some models that are internal. Instead of connecting to a serial port such as a dial-up modem, a cable modem connects to a standard Ethernet port in order to transfer data as quickly as possible.