An AT&T standard for asynchronous 300 bps full-duplex modems using FSK modulation on dial-up lines.
"Bell 103." YourDictionary, n.d. Web. 22 June 2018. <http://www.yourdictionary.com/bell-103>.
Bell 103. (n.d.). Retrieved June 22nd, 2018, from http://www.yourdictionary.com/bell-103
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