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Digital communication system for simultaneous transmission of data from constant and variable rate sources

  • US 5,933,607 A
  • Filed: 03/12/1996
  • Issued: 08/03/1999
  • Est. Priority Date: 06/07/1993
  • Status: Expired due to Fees
First Claim
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1. A communication system comprising a plurality of nodes coupled to a common bus, said plurality of nodes comprising at least one node adapted to communicate CBR traffic and at least one other node adapted to communicate non-CBR traffic on said common bus, each of said plurality of nodes having an access controller operative to control transmission of data on said common bus such that said CBR traffic has priority over said non-CBR traffic, wherein said common bus comprises a transmit path and a return receive path, traffic on said common bus being carried in cells each having an active bit for indicating whether said cell is in an empty or idle state or in an active state, and a request priority field for indicating a priority of request for transmission access to said common bus by one of said nodes, and wherein said access controller of said one of a said nodes requests transmission access on said common bus by writing a priority value into a cell on said receive path, wherein said access controller transmits data on said common bus by writing into a payload field of an empty or idle cell on said transmit path, a cell on said receive path at one of said nodes requesting transmission access having a priority value equal or greater than the priority of said one node is passed unchanged, and wherein a cell on said receive path at said one node requesting transmission access having a priority value less than the priority of said one node is overwritten by said access controller in the request priority field to the priority value of the node.

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