US PATENT SUBCLASS 379 / 351
.~ Signalling integrity protection (e.g., voice signal immunity)

Current as of: June, 1999
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379 /   HD   TELEPHONIC COMMUNICATIONS

350  DF  SUPERVISORY OR CONTROL LINE SIGNALLING {5}
351.~ Signalling integrity protection (e.g., voice signal immunity)

DEFINITION

Classification: 379/351

Signalling integrity protection (e.g., voice signal immunity):

(under subclass 350) Subject matter including circuitry to distinguish between the supervisory or control signal and other signals on the line and prevent response to the other signals.