Dial-up is a legacy standard that transmits data traffic over telephone lines. Dial-up falls under the category of circuit switching and it utilizes the PSTN. A connection is established when the user wants to use the dial-up option and the connection is terminated when the user is done using the link.
Because dial-up connections share the same media as the telephone system, they can only use a limited range of frequencies, which translates to limited bandwidth. Because dial-up connections use an analog signal, you need to use a modem to take the digital signal from . . .
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