Switching system of stored program control type

Details Switching system of stored program control type Switching system of stored program control type

1974-05-28

1976-06-29

Brown, Thomas W.

179 18AB, 179 18FF, H04Q 354

Patent

active

039670716

ABSTRACT:
A telephone switching system of the stored program control type comprising a calling line identifier for identifying the position of a calling subscriber on the switching network and a called line busy status detector for detecting the free or busy status of a called line designated by a central controller. The central controller reads and utilizes the information identified and detected by the above-mentioned two devices respectively, thereby to eliminate the need for memories in the central controller to store the status of all subscribers' lines.

REFERENCES:
patent: 3553384 (1971-01-01), Lucas et al.
patent: 3830983 (1974-08-01), Eddy et al.

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