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Longman Dictionary of Contemporary English
cable modem
noun
EXAMPLES FROM CORPUS
▪ A cable modem comes as part of the service.
▪ Check to make sure you meet the minimum requirements for using a cable modem.
▪ I've found this to be the case-more often than not-with my cable modem service.
▪ I have seen the future and it is a cable modem.
▪ It reiterated that it will work with other cable modem makers, noting that 3Com Corp. will enter the market.
▪ This includes rental of a cable modem.
Wiktionary
cable modem

n. (context Internet English) A modem that connects a personal computer to a fibreoptic cable, typically one used by a digital television system to provide broadband access

Wikipedia
Cable modem

A cable modem is a type of network bridge and modem that provides bi-directional data communication via radio frequency channels on a hybrid fibre-coaxial (HFC) and radio frequency over glass (RFoG) infrastructure. Cable modems are primarily used to deliver broadband Internet access in the form of cable Internet, taking advantage of the high bandwidth of a HFC and RFoG network. They are commonly deployed in Australia, Europe, Asia and the Americas.

Usage examples of "cable modem".

Her technician prisoner had an amazing computer set-up, endless peripherals, cable modem, the works.

Still a great deal more bandwidth than your average cable modem , but not nearly the 5,000,000 Mb/s of the OC-96 .