Bell 212A

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The Bell 212A modulation scheme defined a standard method of transmitting full-duplex asynchronous serial data at 1.2 kbit/s over analogue transmission lines. The equivalent, but incompatible ITU-T standard is V.22.


The Bell 212 Dataset is a modem used for communicating over telephone lines at 300 or 1200 bits per second.[1]

See also[edit]


  1. ^ "BSP 592-039-100: Data Set 212AR-L1A/2A -- Transmitter-Receiver -- Description and Operation", Bell System Practices, American Telephone & Telegraph Co, June 1979