An AT&T standard for asynchronous 1200 bps full-duplex modems using DPSK modulation on dial-up lines.
"Bell 212." YourDictionary, n.d. Web. 05 December 2018. <https://www.yourdictionary.com/bell-212>.
Bell 212. (n.d.). Retrieved December 05th, 2018, from https://www.yourdictionary.com/bell-212
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