This system is ideal for connecting portable terminals or data-capture devices to remote computers using any convenient telephone. The lack of any electrical connection between terminal and phone lines is of benefit when obtaining the approval of the PTT for the use of such a device. The quality of ordinary switched voice circuits normally limits the speed of transmission to 300 baud or less.
"acoustic coupler." A Dictionary of Computing. . Encyclopedia.com. (November 19, 2018). https://www.encyclopedia.com/computing/dictionaries-thesauruses-pictures-and-press-releases/acoustic-coupler
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