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Communications switching system

  • US 4,791,629 A
  • Filed: 06/02/1986
  • Issued: 12/13/1988
  • Est. Priority Date: 06/02/1986
  • Status: Expired due to Term
First Claim
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1. A communications switching system for enabling transfer of voice, data and control signals between a plurality of ports, said system comprising:

  • a time division multiplexed (TDM) bus for carrying said voice, data and control signals;

    a plurality of homogeneous control means coupled to said TDM bus, each of said control means including processing means and storage means;

    a first group of said control means each controlling a fixed number of digital ports, and for selectively coupling said digital ports to said TDM bus;

    a second group of said control means each controlling a fixed number of analog ports, and for selectively coupling said analog ports to said TDM busone of said control means having programming for said first and second groups of control means in said storage means, said one control means providing said programming to said first and second groups of control means during initialization of said system;

    at least one of said second group of control means generating a plurality of progress tones for selectively coupling to said TDM bus;

    each of said control means outputting status information of ports controlled by each of said control means on said TDM bus and monitoring said TDM bus for packets requesting data from one of said control means;

    each of said control means establishing a voice path and a data path between a port controlled by one of said control means and a port requesting communication with said one of said control means;

    each of said control means being assigned a fixed number of slots, wherein each control means requests data from other of said control means during assigned time slots an outputs data onto said TDM bus during unassigned time slots.

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