TheBell 212A modulation scheme defined a standard method of transmittingfull-duplexasynchronous orsynchronous serial data at 1200 bits per second (bit/s) over analogue transmission lines. The equivalent, but incompatibleITU-T standard isV.22.
TheBell 212 Dataset is a 1979-vintagemodem used for communicating over telephone lines at 300 or 1200 bit/s.[1] The 212A standard provides for the ability of a modem to auto-answer a ringing phone.[2]
The Bell 212A scheme was the most common standard used for 1200 bit/s transmission on US data networks such asCompuServe during the 1980s and 1990s, when dial-up access totime-sharing services was the norm, and, starting in 1989,dial-up Internet access.[3][2]
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