US PATENT SUBCLASS 379 / 350
SUPERVISORY OR CONTROL LINE SIGNALLING

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

350SUPERVISORY OR CONTROL LINE SIGNALLING {5}
351  DF  .~> Signalling integrity protection (e.g., voice signal immunity)
352  DF  .~> Substation originated {8}
372  DF  .~> Signal reception at substation {1}
377  DF  .~> Using line or loop condition detection (e.g., line circuit) {7}
386  DF  .~> Signal receiver (e.g., tone decoder)

DEFINITION

Classification: 379/350

SUPERVISORY OR CONTROL LINE SIGNALLING:

(under the class definition) Subject matter for transmitting either a selective control signal, or a status indicating signal, over a telephone line.

(1) Note. Included herein are dialing, ringing, and off-hook signals.

SEE OR SEARCH THIS CLASS, SUBCLASS:

251+, for centralized switching combined with call associated signalling.