Computers can be connected to multimedia, such as sound graphics, photographs, and video equipment to manipulate, input, and generate output, but special software is required.
If a personal computer is within 1,000 feet of another computer, a cable can directly connect it. If the devices are more than 1,000 feet, the electrical signal weakens. Then a modem is used. A computer is designed to process data as digital signals, individual electrical pulses grouped together to represent characters. Telephone equipment was designed to carry voice, which is made up of a continuous electrical wave called an analog signal. The purpose of a modem is to send the converted digital signals of a computer to analog signals to send and then convert the analog signals it receives to digital to send the message back to the computer. A modem may be a part of the computer or a stand-alone device that is connected to the computer and phone line.
Modems can transmit data at rates from 1,200 to 56,200 bits per second (bps) for the personal user.
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