JPS6441595A - System for selecting control information transmission route - Google Patents

Abstract

PURPOSE:To shorten a route establishing time by selecting one of the returned routes of a answer pattern, returning the selection pattern, informing a slave station equipment of the route selecting result, thereafter, connecting a high level data link control (HDLC) procedure communications control means to both the routes and starting communications, by means of a master station equipment. CONSTITUTION:At present, when the necessity to select a digital multiplex line for transmitting orders is generated based on whether digital multiple line to be used for connecting an HDLC procedure communications control circuit 30 and a same circuit 140 is faulted or reset by a central processing unit 11, a master station equipment control part 131 switches a selector 145 from the HDLC procedure communications control circuit 140 to a pattern sending circuit 142, executes a setting to send a normality confirmation pattern to the pattern sending circuit 42, and gives a time switch control memory 137 an instruction so that a time switch 136 can be operated so as to send the pattern to a prescribed time slot for the communications of all digital multiplex lines 3-1-3-i.