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System for switching multirate digitized voice and data

  • US 4,547,877 A
  • Filed: 06/09/1983
  • Issued: 10/15/1985
  • Est. Priority Date: 06/09/1983
  • Status: Expired due to Term
First Claim
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1. A time division multiplex switching system for switching multirate digitized byte-organized signals from source channels carried on input digital carrier lines to destination channels carried on output digital carrier lines, each of said source channels having a predetermined byte rate, each of said input digital carrier lines carrying a predetermined plurality of full-rate channels, comprising:

  • means for generating timing signals defining intervals for digital carrier timing;

    means responsive to said timing signals for generating sequential address signals;

    digital line controller (DLC) means responsive to said timing signals for assembling byte-organized input signals from said input digital carrier lines into DLC output signals and for distributing byte-organized DLC input signals to said output digital carrier lines;

    means for determining an indication of the frame offset of signals for each of said source channels with respect to said timing signals;

    processor means responsive to said frame offset indications for calculating signal memory addresses;

    signal memory means having the capacity to store at least one byte of said byte-organized signals for each source channel for an interval of time defined by the byte rate of the source channel;

    control memory means for storing at least one of said calculated signal memory addresses for each source channel in said input digital carrier lines and for generating signal memory addressing signals;

    said signal memory means being responsive to said signal memory addressing signals and to said sequential address signals to store successive bytes of said DLC output signals and to generate successive bytes of said DLC input signals.

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