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The new competition for Internet Service Providers ISP is the new high-speed digital technology This high-speed digital technology now comes in two different forms Cable modem or DSL digital subscriber line Cable modems piggyback on your local cable TV lines and DSL takes advantage of the already existing phone lines These two services are competing on availability security speed reliability and finally price Therefore lets compare the two A cable modem is a device that allows you to hook your PC to a local cable TV line A cable modem can also be added to or integrated with a set-top box that provides your TV set with channels for Internet Access A cable modem has two connections one to the wall outlet and the other to a PC or to a set-top box for a TV set Although a cable modem does modulate between analog and digital signals it is a much more complex device than a telephone modem It can be an external device or it can be integrated within a computer or set-top box Typically the cable modem attached to a standard 10Base-T Ethernet card in the computer Ulrich DSL is a technology for bringing information to homes and small businesses over ordinary copper telephone lines Plain Old Telephone Service POTS was created to allow the exchange of voice information with other phone users This type of transmission is called an analog signal Analog transmission only uses a small portion of the available amount of information that could be transmitted over copper wires Through the regular modem the ability of your computer to receive information is constrained by the fact that the telephone company filters information that arrives as digital data puts it into analog form for your phone line and requires your modem to change it back into digital DSL is a technology that assumes digital data does not require change into analog from and back Digital data is transmitted to
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