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cable modem - A technologythat uses cable TV lines for data transmission
A cable modem works to turn a cable signal into 6 meghertz electronic stream. This stream is the data that is being transferred from your computer.
Data Over Cable Service Interface Specification (DOCSIS)
Cable TV
A cable modem is a type of modem that provides bi-directional data communication via radio frequency channels on a cable television (CATV) 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 cable television network
To exchange data between two DTE devices
Since this was posted under Cable Modems, I'm assuming that you are asking about the (Data Over Cable Service Interface Specification (DOCSIS) cable modem which allows different cable companies and different cable modem manufactures all to adhere to a uniform set of protocols and modulation schemes to allow for inter and intra market competition. Go to Wikipedia and search DOCSIS for more information if that truly was your question.
Nope. That is dial-up. Cable modems use coaxial cables to transmit data.
A router or possibly a data switch can connect two PC's to a DSL or cable modem.
TV
modem