Telephonic communications – Supervisory or control line signaling – Substation originated
Patent
1994-12-19
1998-01-06
Hong, Harry S.
Telephonic communications
Supervisory or control line signaling
Substation originated
341 22, 379357, 379361, 379362, 379368, 379369, 379387, 379413, H04M 100, H03M 1100
Patent
active
057063400
ABSTRACT:
A serial data generating circuit and a key input signal generating circuit are provided at a panel substrate side, and input key data are transmitted in series to a main substrate side of a telephone apparatus. The number of signal lines connected between the panel substrate and the main substrate are reduced. Further, on the main substrate side downstream of a selection circuit, a data converting and producing circuit which converts the serial input key data into parallel dial data is provided to permit switching of the signal source between a processor and the panel substrate to thereby enable a dial call origination even during a power failure condition.
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patent: 5220597 (1993-06-01), Horiuchi
patent: 5241591 (1993-08-01), Saji
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Hong Harry S.
Rohm & Co., Ltd.
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