The Influence of Transport Layer to Ethernet Services Quality
Questions were analysed regarding the influence of SDH network nodes configuration specifics and TCP and UDP transport protocols on to Ethernet data transferring quality. The influence of virtual container (VC) size on ADM performance was revealed by means of mathematical model created, and it was determined, that the better choice was choosing the larger size VC, because of the smaller packets loss values obtained. The real experiments in STM-1 network helped in solving which transport protocol would be more suitable for data transferring. In case of TCP investigation, TCP windows or VC group formed in ADM size have showed the high and direct influence on to network throughput obtained, because the larger TCP windows applied assured the bigger amount of data transmitted at once. This would be meeting the requirements of Ethernet technology very effectively in high rates. The analysis of UDP showed that the most optimal UDP datagram size for Ethernet packets transferring would be of 800 – 1000 Bytes order. Investigation of UDP suitability for voice packets transferring showed that even if the smaller packet loss will have an insignificant influence on to final quality of real time services, the larger voice packets (800 – 1000 Bytes order) will assure better network throughput, smaller packets loss and Jitter values.
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