摘要：Long lasting Ethernet standards have grown beyond traditional LAN networks through MAN to WAN environment, where it has become the technology which many providers use for developing convergent networks that transport new generation services, such as triple-play widely deployed everywhere – from airports and hotels to large cruise ships. The question of network suitability for providing various communication services has to be considered in practice, especially in case of large ships, as the content of traffic is very diverse with exceptionally variable intensity. Under such specific circumstances for ships theoretical models cannot be directly applied. Rather, network design and implementation depend on practical preliminary test results and analysis. To this end, the out-of-service simulation of either network or user equipment was done according to the RFC 2544 recommendation by means of a smart test device that generates the appropriate test traffic over the Ethernet link from a 3G base station (NodeB) towards the Radio Network Controller (RNC). Network troughput, latency, jitter and frame loss were measured, thus providing the picture of soundness of Ethernet transport layers. However, even the best results in this respect do not necesarily imply a high quality QoS at the application layer. Therefore, the endto-end QoS was tested specifically for concurrent data and for VoIP applications.
