Line powered DCA including dual programmed microcontrollers

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 progra...

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Bibliographische Detailangaben
Hauptverfasser:	ALDRIDGE, TIMOTHY W, VOCE, HAROLD G, HODGE, DEAN Y
Format:	Patent
Sprache:	eng
Schlagworte:	ELECTRIC COMMUNICATION TECHNIQUE ELECTRICITY TELEPHONIC COMMUNICATION TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION
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Beschreibung
Zusammenfassung:	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.