US PATENT SUBCLASS 379 / 290
.~.~.~ With time division of control or supervisory signals

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}
290.~.~.~ With time division of control or supervisory signals

DEFINITION

Classification: 379/290

With time division of control or supervisory signals:

(under subclass 268) Subject matter including a communication channel for control or monitoring signals corresponding to one of a plurality of distinct speech channels and in which access to the communication channel is divided into discrete time intervals, each of such intervals corresponding to one of the speech channels and which are switched so rapidly as to give the effect of simultaneous transmission of all of the control or indicating signals.

(1) Note. Placement in this subclass is limited to those systems in which only the control or supervisory signals are multiplex. Systems in which the voice signals are also multiplexed are found in Class 370.

SEE OR SEARCH CLASS

370, Multiplex Communications, appropriate subclasses for multiplexing of message signals.