US PATENT SUBCLASS 379 / 274
.~.~.~.~.~.~ With busy or idle test

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

242  DF  CENTRALIZED SWITCHING SYSTEM {15}
258  DF  .~ Switching controlled in response to called station addressing signal {9}
268  DF  .~.~ Having shared or common switching control {8}
271  DF  .~.~.~ Having multistage switching {2}
272  DF  .~.~.~.~ Path selection or routing {3}
273  DF  .~.~.~.~.~ Alternate routing {1}
274.~.~.~.~.~.~ With busy or idle test

DEFINITION

Classification: 379/274

With busy or idle test:

(under subclass 273) Subject matter which determine whether or not a component desired for use is already in use.

SEE OR SEARCH THIS CLASS, SUBCLASS:

277, 297 and 381, for busy or idle testing of a telephone system component other than in alternate routing multistage common control.