下一代SONETSDH、弹性分组环、光突发交换：谁是未来城域网最佳选择？.pdfVIP

Next-generation SONET/SDH, RPR, and OBS: which is the best choice for the future Metro Area Networks?1 * Liu Xin , Wang Hongxiang, Ji Yuefeng Key Laboratory of Optical Communication and Lightwave Technologies, Ministry of Education, P. R. China, Beijing University of Posts and Telecommunications, Beijing, China (100876) E-mail ：xin.liu@ Abstract As Internet traffic has been explosively grown in Metropolitan Area Network (MAN), traditional SONET/SDH networks needed to be reengineered to handle data traffic in a more efficient way. Recently, several new technologies have been proposed as a solution for that problem, such as next-generation SONET/SDH, RPR and OBS. However, which is the best choice? In this paper, we compare the performance of these technologies, such as the number of required wavelengths, bandwidth utilization, distribution of delay variation and packet loss rate, network throughput and so on, in a two-fiber ring network model which is the most familiar network architecture in MAN. The simulation results show that taking one with another, OBS is the best solution for the future MAN, though its packet loss rate is a little higher than the other two technologies. Keywords: Metro Area Networks, Next-Generation SDH/SONET, RPR, OBS 1. Introduction In existence for over a decade now, Metropolitan area networks, also referred to as MANs, have traditionally been designed for voice transmission based on time division multiplexing (TDM) technology. At that time, voice traffic was significantly more important than data traffic. As a result, synchronou