Which device converts digital data into analog signals for telephone networks?

Which device converts digital data into analog signals for telephone networks?

• A. Router
• B. Switch
• C. Access Point
• D. Modem

Answer: (D)

Digital-to-analog conversion over telephone lines is handled by a modem. A modem modulates digital data from a computer into analog signals that can travel over the traditional telephone network, and it demodulates incoming analog signals back into digital data for the device on the other end. This bridging capability is what lets a digital network connect to phone lines, as seen in dial-up or DSL setups. In contrast, a router directs packets between networks, a switch moves frames within a local network, and an access point provides wireless access. Some devices combine modem and router features in one box, but the modem’s primary job is converting between digital and analog to ride the phone network.

Digital-to-analog conversion over telephone lines is handled by a modem. A modem modulates digital data from a computer into analog signals that can travel over the traditional telephone network, and it demodulates incoming analog signals back into digital data for the device on the other end. This bridging capability is what lets a digital network connect to phone lines, as seen in dial-up or DSL setups. In contrast, a router directs packets between networks, a switch moves frames within a local network, and an access point provides wireless access. Some devices combine modem and router features in one box, but the modem’s primary job is converting between digital and analog to ride the phone network.