An AT&T standard for asynchronous 1800 bps full-duplex modems using DPSK modulation over four-wire leased lines as well as 1200 bps half-duplex operation over dial-up lines.
"Bell 202." YourDictionary, n.d. Web. 16 September 2018. <http://www.yourdictionary.com/bell-202>.
Bell 202. (n.d.). Retrieved September 16th, 2018, from http://www.yourdictionary.com/bell-202
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