WHICH OF THE FOLLOWING IS USED FOR MODULATION AND DEMODULATION

• A. Gateway
• B. Protocol
• C. Modem ✓
• D. Multiplex

The answer to the question is: C. Modem

A modem, short for modulator-demodulator, is a device used to transmit and receive digital information over analog communication channels. It serves as a bridge between the digital signals generated by computers and the analog signals used by telephone lines or cable systems. Modems enable data communication between computers and are crucial for accessing the internet, sending emails, and connecting to remote networks.

Modems work by converting digital data into analog signals that can be transmitted over the communication channel, such as a telephone line. This process is known as modulation. On the receiving end, the modem converts the analog signals back into digital data, a process called demodulation. The data is then decoded and made available to the computer or network device.

There are different types of modems, including dial-up modems, cable modems, DSL (Digital Subscriber Line) modems, and wireless modems. Dial-up modems were widely used in the past but have become less common with the advent of broadband internet connections. Cable modems use the existing cable television infrastructure to provide high-speed internet access. DSL modems use telephone lines to transmit digital data at high speeds. Wireless modems, also known as mobile hotspots or cellular modems, use cellular networks to provide internet connectivity.

Modems have evolved over time to support faster data transfer rates. Early dial-up modems operated at speeds of up to 56 kilobits per second (Kbps). As technology advanced, faster modems were developed, such as V.90 and V.92 modems capable of reaching speeds of up to 56 Kbps downstream and 48 Kbps upstream. With the introduction of broadband technologies like cable and DSL, modem speeds increased significantly, offering download speeds in megabits per second (Mbps) and upload speeds in kilobits per second (Kbps). Today’s modern modems can achieve speeds of several gigabits per second (Gbps).

Modems play a crucial role in connecting individuals and businesses to the internet and facilitating data communication. They have undergone significant advancements over the years, enabling faster and more reliable internet connections.