H - Electricity – 04 – M
Patent
H - Electricity
04
M
379/45
H04M 13/00 (2006.01)
Patent
CA 1072697
ABSTRACT OF THE DISCLOSURE After description of a number of prior art automatic telephone number identification systems and certain problems associated therewith, a new method and apparatus for use in such systems which overcomes the pro- blems of the prior art is described. In its preferred form, the method includes the steps of applying to the telephone line at a central office a voltage which has a magnitude sufficient to produce a first predetermined value of loop current in the telephone line. At each party station, the loop current is caused to change between the first predetermined value and a second predetermined value in a manner unique to that party station, with the second predetermined value being smaller than the first predeter- mined value but greater than a value of loop current that would signify to the central office that an on-hook condition exists on the telephone line. At the central office, the loop current change is detected and com- pared with a plurality of stored loop current changes to provide party station identification, with each stored loop current change being unique to each party station. In a preferred embodiment, these steps occur in a predetermined time sequence, with the loop current changes also occurring at predetermined but distinct time intervals each of which is unique to a party station. The apparatus for practicing this method includes an automatic party identifier for location at the central office and a subscriber module adapted to be located in circuit with a party station and the telephone line.
333033
Cole Darrell D.
Proctor D. Frederic
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