A computer has to be equipped with a device called a modem before it can be connected to a telephone or cable TV line. Following are the most common connection types and each requires a different modem type.
· Regular low-speed (voice) telephone line (dial-up connection)
· High-speed DSL (Digital Subscriber Line) telephone line connection
· Cable TV line

How The Internet Works (Modems)
The Internet
Telephone
or
Cable
Company
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Cable Modem Shown
Dial-up Modem is Usually an Internal PC Card
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