US PATENT SUBCLASS 370 / 426
.~.~.~ Having a signaling feature

Current as of: June, 1999
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370 /   HD   MULTIPLEX COMMUNICATIONS

351  DF  PATHFINDING OR ROUTING {5}
389  DF  .~ Switching a message which includes an address header {11}
422  DF  .~.~ Centralized switching {3}
426.~.~.~ Having a signaling feature

DEFINITION

Classification: 370/426

Having a signaling feature:

(under subclass 422) Subject matter wherein supervisory information is communicated between switches to control the switches.