How does a modem work ??

Question

Explain orally the basic principles,covering the complete link from telephone connection point to the application programme

Answer 1

http://computer.howstuffworks.com/modem.htm

Answer 2

A modem is a device that converts digital signals from a computer's serial port to the analog signals required for transmission over traditional telephone lines, and vice versa. Modem stands for modulator/demodulator. Conversion is necessary because telephone lines were initially designed to handle the analog nature of the human voice, not data.

The speed at which a modem transmits data is measured in units called bits per second or bps. The first modems ran at even less than 300 bps. Now 1200, 2400, and 9600 bps modems are considered slow. The faster models reach speeds of 14,400 and 28,800 bps. The faster the modem, the faster the data (for example, images from the Web) appear. Even a 28,800 bps modem, however, cannot compare to the several million bps speed that a campus Ethernet connection gives you.