(from a combination of MOdulate and DEModulate) electronic equipment consisting of a device used to connect computers by a telephone line, An electronic device that converts electronic signals into sound waves, and sound waves into electronic signals, used to transmit information between computers by the use of ordinary telephone lines; also called modulator-demodulator. The speed of transmission of information by a modem is usually measured in units of baud, equivalent to bits per second, A device that transmits and receives data using a modulated carrier wave. Modems are used to establish network and Internet connections