2002 - cesnet

Figure 9.5: Throughput (left) and delay (right) with MDRR and WRED configurationWe changed the division of the line capacity to 30 % to 70 % and set up of queuefilling and the corresponding probability of packet discarding to be the samefor both flows:cos-queue-group group1random-detect-label 0 100 200 1random-detect-label 1 100 200 1Figure 9.6: Throughput (left) and delay (right) with MDRR and WRED configuration,identical interval of discardingFor the development of the throughput and the delay of the testing flow, seeFigure 9.6. The function of the MDRR algorithm is now clearly observable; thetesting data flow has been allocated the exact required share in the line capacity.We can also see lower delay during the period of applying background flow,thanks to the lower limits for the area of packet discarding in WRED configuration.9.3 Influence of QoS Network Characteristicson Transmission of MPEGVideoHigh-quality multimedia transmission is one of the perspective applications ofcomputer networks in the future. For these transmissions, we usually use thecoding in the MPEG format (MPEG1, MPEG2 or MPEG4). The required bandwidthoscillates from several to several dozen Mbps and it is therefore relatively126 High-speed National Research Network and its New Applications 2002