Chapter 10 Traffic Management in Isochronets Networks Kelvin Lopes Dias 1 , Jose Augusto Suruagy Monteiro 2 and Danilo Florisse 1 Universidade Federal de Pernambuco-UFPE, Centro de Informatica P.O. Box 7851, CEP: 50732-930, Recife,Pernambuco - Brazil E-mail: kld@cin.ufpe.br 2 Universidade Salvador- UNIFACS, Engineering Departament E-mail: suruagy@unifacs.br 3 Columbia University, Departament of Computer Science Distributed Computing and Communications Lab 450 Computer Science Bldg, New York, NY, USA 10027 E-mail: df@cs.columbia.edu Key words: Quality of Service, Isochronets, RDMA, Leaky Bucket, Virtual Clock Abstract: This paper presents an evaluation of a traffic management mechanism for high speed networks called RDMA (Route Division Multiple Access), developed as part of the Isochronets, a novel architecture for high speed networks. RDMA enables routes to designated destinations during time intervals (green-bands) available periodically. We evaluated the support RDMA offers to applications quality of service (QoS) represented by delay and jitter and its network congestion prevention effectiveness. RDMA is compared to two other well- known mechanisms: Virtual Clock and Leaky Bucket. RDMA showed itself to be satisfactory as an access control mechanism for applications with strict QoS requirements. In RDMA, memory resource needs at network elements is minimized; traffic sources or network peripheral elements are responsible for the use ofa large quantity of memory. 1. INTRODUCTION The multiservice structure of the broadband networks will carry a mix of traffic types ranging from traditional data communications to high quality video transmission, like: telemedicine, video on demand, and virtual reality. J. N. de Souza et al. (eds.), Managing QoS in Multimedia Networks and Services © Springer Science+Business Media New York 2000