IPPM measurements and network load behavior of the German Research Network G-WiN

The Quality of Service (QoS) of the German Research Network G-WiN has been continuously monitored since Fall 2003. All 27 core nodes of the network are equipped with GPS-based measurement stations. The IPPM measurements provide one-way delay (OWD), one-way delay variation (OWDV) and loss ratios according to RFC-2330. The analysis of the data has produced some interesting results: While high network loads lead to high delays, high network delays can also be observed at times without any correlation to network loads. The study describes the traffic measurement. process and provides an overview of one-way delay analysis with associated network load behavior.