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Multiple data rate digital switch for a TDMA communications controller

  • US 4,332,026 A
  • Filed: 03/07/1980
  • Issued: 05/25/1982
  • Est. Priority Date: 03/07/1980
  • Status: Expired due to Term
First Claim
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1. A multiple data rate digital switch for a TDMA communications controller having a plurality of input/output ports for transferring ni channels of m data units each per TDMA frame from respective, local data users to a TDMA transmit burst communication link and transferring ni of said channels of data from a TDMA receive burst communication link to said respective local users on a time interleaved basis during periodic TDMA frames, each port operating at its own data rate Ri, comprising:

  • a transmit burst buffer having a data input connected to a transmit bus common to the data outputs of all of said ports and a data output connected to said TDMA transmit burst communication link, with a plurality of addressable storage locations arranged into rows and m juxtaposed columns;

    a receive burst buffer having a data input connected to said TDMA receive burst communication link and a data output connected to a receive bus common to the data inputs of all of said ports, with a plurality of addressable storage locations arranged into rows and m juxtaposed columns;

    a scanner having a periodic cycle of m scans per TDMA frame, there being a frame rate of f frames per second, with a scan count output connected as a column address input to said transmit burst buffer and to said receive burst buffer;

    a switch control memory, having an address input connected to a scan output of said scanner, a port select output connected to a control input to each of said ports and a stored address output connected to a row address input to said transmit burst buffer and to said receive burst buffer, for storing ni control words for each of said ports, each of ni controls words for the i-th port and issuing a port select signal to said i-th port and issuing a distinct row address to said transmit burst buffer and said receive burst buffer when scanned by said scanner, where ni =Ri /mf;

    whereby ports having a variety of data rates can be serviced on a time interleaved basis.

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