Collecting switching system call data

Details Collecting switching system call data Collecting switching system call data

1975-02-24

1976-03-16

Claffy, Kathleen H.

H04M 1510

Patent

active

039447464

ABSTRACT:
A stored program digital signal processor (e.g., Digital Equipment Corporation PDP 11/40) is used to collect billing data (e.g., Initial Entry data for Automatic Message Accounting) from a common control circuit (e.g., marker) of a common control automatic telephone switching system (e.g., the Bell System No. 5 Crossbar system). Ten marker control status indicating leads are scanned by the signal processor fast enough to detect any change in the signals on the 10 status leads which, in signal content as a group, represent the control status of the marker at any given time. When two successive prescribed control status changes occur, a large number of marker data leads are scanned by the signal processor so as to allow collection of that data and the storage thereof in a marker core buffer area of the signal processor. The stored data, previously registered in the marker incident to the assumption by the marker of certain control statuses, includes such Initial Entry data as calling circuit identity, called circuit identity, type of call, trunk circuit used, et cetera. The collected data is involved in subsequent processing (not disclosed) of the entire billing data for a call responsive to answer and disconnect timing entries.

REFERENCES:
patent: 3651269 (1972-03-01), Le Strat et al.
patent: 3697695 (1972-10-01), Pommering et al.
patent: 3748392 (1973-07-01), Henquet et al.
patent: 3770893 (1973-11-01), Conerly
patent: 3808373 (1974-04-01), McLaughlin
patent: 3828135 (1974-08-01), Padgett
patent: 3829617 (1974-08-01), Caithamer et al.
patent: 3898386 (1975-08-01), Gaon

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