Communication apparatus

Details Communication apparatus Communication apparatus

1995-10-02

1999-02-23

Lee, Thomas D.

Facsimile and static presentation processing

Facsimile

358425, 358442, 358468, H04N 100

Patent

active

058750371

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.

REFERENCES:
patent: 4746986 (1988-05-01), Tanigawa
patent: 5034948 (1991-07-01), Mizutani et al.
patent: 5127046 (1992-06-01), Malm
patent: 5142568 (1992-08-01), Ogata et al.
patent: 5204949 (1993-04-01), Yasue et al.
patent: 5218680 (1993-06-01), Farrell et al.

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