Method and apparatus for checking connection paths in a telephon

Details Method and apparatus for checking connection paths in a telephon Method and apparatus for checking connection paths in a telephon

1978-06-20

1980-01-22

Robinson, Thomas A.

17917523, H04M 324

Patent

active

041851749

ABSTRACT:
Apparatus for checking electrical connections switched through an automatic switching machine. Idle circuits (P1, Pn) e.g. subscriber lines and outside lines, are connected in turn through the switching machine to the terminating set (Tr) thereof. Tone is applied via the normal tone-feed circuits (GT C1 to Cn, TL1 to TLn) to the idle line and the tone is detected at the terminating set. All lines at the terminating set are scanned (Y1 to Yn) in turn to check for any possible cross-connection and then the next idle circuit is tested. The apparatus forms an integral part of the switching machine.

REFERENCES:
patent: 3937908 (1976-02-01), Funk et al.
patent: 4024359 (1977-05-01), DeMarco et al.

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