What Does Bell 103 Mean?The Bell 103, which was the first commercial computer modem, is an AT&T standard for asynchronous 300 bps full-duplex modems that use frequency-shift keying (FSK) modulation on dial-up lines. Developed in 1962, the Bell 103 modem facilitates digital data transmission at a speed of 300 bps over regular phone lines. It is a split-channel modem and is ideal for low-demand users that exchange PC files on a frequent basis.
Bell 103 modulation is used in amateur radio, shortwave radio and commercial applications. Its use of audio frequency and low signaling speed makes it compatible with unreliable narrowband links.