US PATENT SUBCLASS 379 / 271
.~.~.~ Having multistage switching

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.~.~.~ Having multistage switching {2}
272  DF  .~.~.~.~> Path selection or routing {3}
278  DF  .~.~.~.~> Interstage junctor or "trunk"

DEFINITION

Classification: 379/271

Having multistage switching:

(under subclass 268) Subject matter wherein the switching is performed by plural interconnected and interactive switching stage.