1974-05-23
1976-03-09
Cooper, William C.
179 2DP, H04M 145
Patent
active
039433005
ABSTRACT:
A repertory dialler has a main digital data store for the storage of information required for impulsing to line upon operation of a selected call push-button. This store is a circulating dynamic store. The dialler may be operated either in a recording mode or in an impulsing mode as determined by the position of a manually-operable switch.
In the recording mode, the identity of a call push-button that has been operated is first written in digital form into a circulating buffer store. This is followed by the decimal digits of the exchange and/or directory number of a subscriber which are entered by means of a digit keypad. When all the required digits have been so stored, the data temporarily stored by the buffer store is transferred to the main store and in the main store is added to the end of the block of data circulating therein.
When the dialler is used in the impulsing mode, operation of a selected call push-button causes the appropriate dialling information to be written into the buffer store from which it is rapidly transferred, one decimal digit at a time, to the line impulsing circuit which itself has data storage provision. Operation of the digit keypad at this time enables one or more additional decimal digits (for example in respect of the number of an extension party) to be impulsed to line. These digits are temporarily stored by the buffer store prior to transfer to the impulsing circuit.
REFERENCES:
patent: 3601552 (1971-08-01), Barnaby et al.
patent: 3617638 (1971-11-01), Jochimsen
patent: 3647973 (1972-03-01), James et al.
patent: 3668330 (1972-06-01), Hemdal
patent: 3670111 (1972-06-01), Bukosky et al.
patent: 3735050 (1973-05-01), Mardas
patent: 3812296 (1974-05-01), Paraskevakos
Brigance Gerald L.
Cooper William C.
The General Electric Company Limited
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