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The authors present a packet scheduler called "Shortest Queue First" (SQF) that aims at protecting audio and video traffic from the congestion caused by data traffic. Unlike standard solutions, the services to be handled with priority are not known in advance. It is rather the traffic characteristics of audio and video applications that are used to detect their delay sensitivity. The SQF algorithm does not require any prior configuration of the network and, as such, adapts to the fast evolution of traffic and usage. The performance of the proposed solution is demonstrated using both analysis and experiments on a testbed emulating a residential access line.
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