Telephonic communications – Supervisory or control line signaling – Substation originated
Patent
1998-03-12
2000-09-12
Chan, Wing F.
Telephonic communications
Supervisory or control line signaling
Substation originated
379456, H04M 100
Patent
active
061188670
ABSTRACT:
A tray for automatic dial telephones has a construction that lots of specific telephone numbers are stored in its internal memory, and when a preselected switch is turned "ON" a dial tone of telephone number that we are dialing is outputted through the speaker. After one of button switches is turned "ON" to output a dial tone of telephone number stored in the internal memory, it is activated for a short period of time by being initialized through a return signal, thereby using the tray economically. In addition, an external telephone line and a telephone's telephone line are respectively connected to a telephone tray main body, so that when a telephone number is selected, the dial tone of telephone number stored in the memory is simultaneously outputted via the external telephone line and the telephone's telephone line, by telephone line's power value increasing/decreasing method. In this connection, there is no need to use a separate power source and pick up the handset, in order to output the dial tone of specific telephone number.
REFERENCES:
patent: 3705960 (1972-12-01), Evans et al.
patent: 4941172 (1990-07-01), Winebaum et al.
patent: 4985918 (1991-01-01), Tanaka et al.
Chan Wing F.
Chang-EI Communications Co. Ltd.
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