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Synchronised data delivery

  • US 20030021231A1
  • Filed: 08/30/2002
  • Published: 01/30/2003
  • Est. Priority Date: 03/17/2000
  • Status: Active Grant
First Claim
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1. A forwarding apparatus for use in a data distribution system comprising a plurality of forwarding apparatuses, linked by a communications network, for forwarding data elements from a source of data elements to one or more receivers accessible to forwarding apparatus of the system, said forwarding apparatus having:

  • an input for receiving a data element to be forwarded;

    timer means;

    monitoring means for monitoring at least one predetermined characteristic contributive to delay in transferring a data element between forwarding apparatuses of the system and to periodically output data indicative of the contribution to delay due to each said monitored characteristic;

    calculating means operable to calculate, from an output of the monitoring means, a maximum expected delay in transferring a data element from said forwarding apparatus to a destination forwarding apparatus for delivery to a receiver and thereby to calculate, at a time indicated by the timer means, a current prescribed time for delivery of the data element to a receiver by said destination forwarding apparatus; and

    forwarding means operable to write into a received data element a current prescribed time for delivery as calculated by said calculating means, and to forward the received data element.

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