US PATENT SUBCLASS 379 / 337
.~ With busy-idle test (e.g., idle trunk finder)

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

333  DF  CONCENTRATOR OR TRUNK SELECTOR {4}
337.~ With busy-idle test (e.g., idle trunk finder)

DEFINITION

Classification: 379/337

With busy-idle test (e.g., idle trunk finder):

(under subclass 333) Subject matter which determines if a trunk is in use and controls the switching in response to a determination of nonuse.

SEE OR SEARCH THIS CLASS, SUBCLASS:

274, 277, 297, and 381, for busy or idle testing.