US PATENT SUBCLASS 379 / 277
.~.~.~.~.~ With busy or idle test

Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use


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}
277.~.~.~.~.~ With busy or idle test

DEFINITION

Classification: 379/277

With busy or idle test:

(under subclass 272) Subject matter which determines whether a line or a switching element is in use.

SEE OR SEARCH THIS CLASS, SUBCLASS:

274, for busy or idle testing of a telephone system component in alternate routing multistage common control equipment.

297, 337 and 381, for busy or idle testing of a telephone system component other than in multistage common control equipment.