Line powered DCA including dual programmed microcontrollers
US5224154A · kind A · utility
107Cited by
16References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 6, 1991 |
| Grant date | Jun 29, 1993 |
| Priority date | — |
| Expiry date | Sep 6, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M19/008
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.