US PATENT SUBCLASS 379 / 381
.~.~ Busy test or make busy

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

350  DF  SUPERVISORY OR CONTROL LINE SIGNALLING {5}
377  DF  .~ Using line or loop condition detection (e.g., line circuit) {7}
381.~.~ Busy test or make busy

DEFINITION

Classification: 379/381

Busy test or make busy:

(under subclass 377) Subject matter for determining whether or not a loop or line connected to a terminal is in use, or to simulate such an in-use condition on a line.

SEE OR SEARCH THIS CLASS, SUBCLASS:

274, 277 and 337, for various busy testing circuits.