On the mutual influence of data and video traffic in video-over-DSL services

Several European xDSL operators have launched or are going to launch video-over-DSL services in which the DSL link is shared by a data service (IP, UDP and TCP) and a video channel (typically an MPEG-2 flow). Since video is usually favored by assigning a higher priority (via a class-based scheduling discipline), TCP adapts itself to the fractal properties of the video flow, which is known to have a high level of fractality. This paper sets up a ns-2 simulation for the analysis of the mutual influence of video and data traffic in a DSL link and verifies the fractality propagation phenomenon. This paper also explains the fractality of the data transmitted from one traffic flow to another.