An AT&T standard for synchronous 4800 bps modems. Bell 208A is a full-duplex modem using DPSK modulation over four-wire leased lines. Bell 208B was designed for half-duplex operation over dial-up lines.
"Bell 208." YourDictionary, n.d. Web. 05 December 2018. <https://www.yourdictionary.com/bell-208>.
Bell 208. (n.d.). Retrieved December 05th, 2018, from https://www.yourdictionary.com/bell-208
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