What is the primary function of a modem in telecommunications?

• A. To amplify signals for long-distance communication
• B. To convert voice signals into data packets
• C. To modulate and demodulate signals for communication
• D. To serve as a router for multiple networks

Answer: (C)

The primary function of a modem in telecommunications is to modulate and demodulate signals for communication. Modulation is the process of converting digital signals from a computer into analog signals that can be transmitted over telephone lines or radio frequencies. Conversely, demodulation is the process of converting incoming analog signals back into digital signals for use by the computer. This dual function allows modems to facilitate data transmission over various types of communication lines, making them essential for connecting devices to the internet and enabling effective communication between different networks.

The other roles mentioned, such as amplifying signals for long-distance communication or converting voice signals into data packets, do not accurately describe the primary function of a modem. While a modem can be involved in data transmission, its core capability lies in its ability to modulate and demodulate signals. Additionally, while routers manage data traffic between networks, they operate distinctly from modems, which specifically handle signal conversion tasks.