A study on resilient packet star-ring

Resilient packet ring (RPR) is a key technology on the development of Metropolitan Area Networks (MAN). Because of the limitation of ring structure, this paper propose a novel scheme which combines RPR and WDM technology: by putting ring structure together with star structure, we get a bidirectional four-ring structure, in which the outer two rings form a standard RPR, and the inner two rings form a star structure logically. The simulation analysis shows the performance of the proposed structure including transmission delay and throughputs are prior to the RPR.