INTERCHANGE TIME EXCHANGER AND METHOD FOR ESTABLISHING CONFERENCE COMMUNICATIONS IN A PCM SWITCHING SYSTEM

摘要

A. INTERCHAPTER OF TIME INTERVALS IN A PCM SYSTEM COMPRISING ACCESS CIRCUITS 101-OA 100-N AND POSTS 100-1 TO 100-N. / P P B.IL HAS A RECLINER 107 RECLINER A MEMORY OF ACCUMULATION, FOR ESTABLISHING COMMUNICATIONS FOR CONFERENCE, AND A PROGRAM MEMORY 136; A LOGIC CIRCUIT FOR FORMING, IN RESPONSE TO CALL SIGNALS, AN SUM SIGNAL WHICH IS PLACED IN AN ALLOCATED LOCATION OF THE ACCUMULATION MEMORY, THE PROGRAM MEMORY 136 SEQUENTIALLY APPLYING THE DIGITAL CALL SIGNALS AND THE SUM SIGNAL TO THE PROCESSOR 107 WHICH REPLIES BY FORMING A SIGNAL OF DIFFERENCE; AND OUTPUT MEMORY FOR APPLYING THE SIGNALS OF DIFFERENCE TO ONE OF THE ACCESS CIRCUITS 101-O TO 101-N. / P P C.APPLICATION TO TELEPHONY.