Noun
English Wikipedia has an article on:cable modemWikipedia
cable modem (plural cable modems)
(Internet) A modem that provides data communication via radio frequency channels over any of a variety of cable types to establish a cable internet connection.
Cable modem flap Cable modems can have a problem known in industry jargon as "flap" or "flapping". citation A modem flap is when the connection by the modem to the head-end has been dropped (gone offline) and then comes back online. Source: Internet