Delay Differentiated IP over Hierarchical WDM Ring Networks

WDM (wavelength division multiplexing) appears to be the solution of choice for providing a faster networking infrastructure that can meet the explosive growth of the Internet. It has the scalability problem with increasing the access node numbers in WDM ring architecture, so we further propose the alternatives of hierarchical WDM ring architecture. In this architecture the number of routing nodes and user nodes shown as formulas and propose the routing rules. Finally, the proportional delay differentiated mechanism is added for this system to support DiffServ (differentiated services).