Communication apparatus
US5875037A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 2, 1995 |
| Grant date | Feb 23, 1999 |
| Priority date | — |
| Expiry date | Oct 2, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04Q2213/13322
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A communication apparatus which is connected to an ISDN includes a data input/output (I/O) unit for inputting/outputting data and an ISDN interface to control the data input/output operations between the data I/O unit and the ISDN. The ISDN interface is constructed on a one-chip IC and at least includes an interface for separating B-channel data and D-channel data and for inputting/outputting the data, a switch for switching data paths in accordance with the classification of the information of the B-channel data and a modem which is connected to the path for 3.1K audio in the path of the B-channel data. The ISDN interface further has a speed matching processing circuit for matching the speed of the data which is inputted/outputted to/from the data I/O unit with the speed of 64k non-limit digital data. A commercial power source is supervised and the occurrence of a power failure is detected by a detecting unit. In case of a power failure, a power supply mode is switched from a commercial power source to a power supply from the line and the power source is supplied to the ISDN I/F unit and the one-chip microcomputer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.