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A cable modem is a hardware device that allows your computer to communicate with an Internet Service Provider over a landline connection.A cable modem works by connecting a coaxial cable to a jack in the wall and then a Cat5 ( Ethernet) cord from the modem to a computer or a network router .
Most cable modems include a standard RJ45 port that connects to the Ethernet port on your computer or
router . Since most homes now have several Internet-enabled devices, cable modems are typically connected to home router, allowing multiple devices to access the Internet.
Cable modems send and receive information digitally, so there is no need to modulate an analog signal.