Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Of centralized switching system
Patent
1986-03-19
1987-09-08
Schreyer, Stafford D.
Telephonic communications
Diagnostic testing, malfunction indication, or electrical...
Of centralized switching system
379 17, 324421, 324423, H04M 328
Patent
active
046929398
ABSTRACT:
Switches of telephone grids are tested for delayed action subsequent to, but within a number of milliseconds after, actuating the opening or closing of the switches. Excessive delay indicates approaching failure.
REFERENCES:
patent: 4167656 (1979-09-01), Duyance et al.
Communications Test Design, Inc.
Schreyer Stafford D.
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