Trunk test circuit

Details Trunk test circuit Trunk test circuit

1979-09-26

1981-01-27

Robinson, Thomas A.

H04B 346

Patent

active

042477425

ABSTRACT:
A trunk test circuit (107) is disclosed in a stored program controlled toll switching system (103) for executing tests to determine transmission quality of communication trunks connected to a remote telephone office (101). A detector circuit (200) has a novel feedback arrangement comprising a selectable frequency source, comparison circuitry, and a sample and hold circuit, for generating output test signals corresponding to priorly received incoming test signals. The detector circuit is responsive to control signals received from a sequence control circuit (201) for receiving, measuring, and transmitting test signals on a communication trunk (102) under test.

REFERENCES:
patent: 2666099 (1954-01-01), Bonner
patent: 2721235 (1955-10-01), McKim et al.
patent: 3777081 (1973-12-01), Vierling et al.
patent: 3920935 (1975-11-01), Vierling et al.
patent: 4086448 (1978-04-01), Anglikowski
patent: 4170722 (1979-10-01), Blackburn

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