Automatic exchange with a digital switching network

In an automatic exchange with a digital switching network, for the connection of circuits or subscriber lines, said exchange comprising;

• at least one central computer, signalling receiver and sender peripherals serving said circuits or lines, switching network marker peripherals, said central computer controlling all of said peripherals, and said circuits or lines being connected to the switching network (RCX) by digital channels in time division multiplex links;
• the improvement wherein certain peripherals (UP1, LMQ) are piloted by the computer through said switching network RCX, the messages enabling computer (UCA) to pilot at least one peripheral (UP1, LMQ) being carried by a digital connection comprising two TDM-PCM links (MIC-C, MIC-P/MIC-M) connected to the switching network (RCX), the first said link (MIC-C) connecting to the computer, and the second (MIC-P/MIC-M) connecting to said peripheral (UP1/LMQ), and wherein at least one signalling peripheral (UP1) is connected to the switching network RCX by a TDM-PCM link (MIC-P), and said link comprising channels connected through the switching network to the signalling channels of digital PCM links (MIC-A), assigned to said circuits or said subscriber lines, and also channels connected through the switching network to channels in digital PCM links (MIC-C) connecting to the computer.