Bundling Internet Traffic over VBR ATM Networks, Canada - Germany Research Activity

An initiative between DeTeBerkom in Berlin and the Communication Research Centre CRC in Ottawa was undertaken to determine realistic resource reservation requirements when IP telephony applications are multiplexed with bulk data applications in an ATM network. In our work, we considered different ways of bundling voice i.e. IP telephony and data traffic. We analyse the throughput achieved for the data traffic and the rate, packet loss and delay variance for the voice traffic for each bundle type. We illustrate the specific effects that different performance factors such as VBR traffic parameters, the TCP flow control and send window size, network delay, system scheduling and application traffic have on the QoS provision in an ATM Wide Area Network WAN and Local Area Network LAN environment. Trans-Atlantic connections, using national high-speed test networks and Teleglobes trans-Atlantic submarine fibre CANTAT-3 are used to obtain the ATM WAN measurements. LAN measurements are performed using an ATM LAN testbed at CRC. The experiments are performed and evaluated with the CM Toolset, which provides for the automation of QoS analysis of selected applications under different A TM ne1.work environments.