An AT&T standard for synchronous 2400 bps full-duplex modems using DPSK modulation. Bell 201B was originally designed for dial-up lines and later for leased lines. Bell 201C was designed for half-duplex operation over dial-up lines.
"Bell 201." YourDictionary, n.d. Web. 17 September 2018. <http://www.yourdictionary.com/bell-201>.
Bell 201. (n.d.). Retrieved September 17th, 2018, from http://www.yourdictionary.com/bell-201
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