Telephonic communications – Telephone line or system combined with diverse electrical... – Having transmission of a digital message signal over a...
Patent
1991-09-06
1993-06-29
Dwyer, James L.
Telephonic communications
Telephone line or system combined with diverse electrical...
Having transmission of a digital message signal over a...
379100, 375 8, H04M 1100, H04B 138
Patent
active
052241548
ABSTRACT:
A line powered data communication apparatus (DCA) includes dual programmed microcontrollers, one being interfaceable with data terminal equipment and the other for governing the operation of modem circuitry of the DCA which is interfaceable to a telephone line of a telephone network. The dual programmed microcontrollers interact with each other over an electrically isolated interface, preferably including optical isolators. Power is derived for the one microcontroller from the signal lines interfacing the data terminal equipment. In addition, power is derived for the other microcontroller and modcircuitry from the telephone line.
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Vocal's Pocket Modem Eliminates the Need for Outside Power Source P. C. Week, Nov. 13, 1989, p. 99.
Aldridge Timothy W.
Hodge Dean Y.
Voce Harold G.
Chan Jason
Dwyer James L.
Egan Wayne J.
Universal Data Systems, Inc.
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