What is the primary function of a digital modem in a telecommunications network?

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The primary function of a digital modem in a telecommunications network is to convert digital signals to analog signals and vice versa for transmission over communication lines. This process is essential because many communication mediums, such as telephone lines, were originally designed for analog signals. The modem allows digital data from devices, like computers or routers, to be transmitted over these analog systems by converting the digital information into an analog form that can travel the communication lines. Upon reaching the destination, the modem then converts the analog signals back into digital form for the receiving device. This bidirectional conversion is crucial as it enables seamless communication between digital devices using infrastructure that may only support analog transmissions.

The other options, such as amplifying analog signals, encrypting data, or connecting multiple networks, do not represent the primary role of a modem. While amplifying signals can be done by separate amplification devices, encryption is typically handled by different protocols or devices focused specifically on security, and connecting networks usually requires routers or similar networking hardware. Understanding the core purpose of a modem helps clarify its vital role in enabling digital data communication over existing analog systems.

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