SYSTEM FOR SWITCHING SUBSCRIBER'S LINE OF ISDN

摘要

PURPOSE:To make user side facilities commonly usable against all subscriber's lines so as to prevent artificial operational mistakes by installing a subscriber's line switching device to a user's private telephone set housing plural subscriber's lines provided for making direct communication with plural ISDNs. CONSTITUTION:The subscriber's line switching system is constituted by inserting a subscriber's line switching device between subscriber's private facilities TE and network terminal equipment NT1 so that necessary information can be transmitted by selecting subscriber's lines in accordance with communication contents. Moreover, while it is not shown in the figure, a subscriber's line switching device is provided between two kinds of network terminal equipment NT1 and NT2 at a primary-group interface. A processor 10 for processing calls to a layer 3 is used for grasping the content of a D-channel messager packet and constituted by using a CPU loading software as a base and a switch 11 can be realized when a matrix switch or gate array widely used for TAs and exchanges is used.