Performance analysis of FDL buffers: a heuristic approach with impatience and quantization
For current backbone networks,the capacity limit is not fiber throughput (> 10 Tbit/s per fiber),but rather,switching speed. Optical switching (Optical Packet Switching,Op tical Burst Switching,and others) provides a viable alternative,relying on Fiber Delay Lines (FDLs) for buffering. The main feature of such a buffer is the quantization of possible delays: only delays equal to the length of one of the FDLs can be realized. The impact of quantization on buffer performance is huge. A recent numerical procedure for single-wavelength buffers allows exact numerical evaluation of this impact,but does not allow for practical insight. Moreover,it lacks the poten tial of generalization,needed to evaluate the performance of buffers with multiple wavelengths at the output. Countering this,we applied a heuristic combination of wo existing queueing models: one with quantization,and one with impatience. As we show in this paper,this combination yields accurate performance results. Key vantage of this heuristic is that it translates the FDL buffer problem into two well-known queueing problems,with accurate performance expressions available in literature,even for multiple wavelengths. This paper presents the heuristic in detail,together with several figures,comparing the heuristic’s output to exact results.
W. Rogiest K. De Turck K. Laevens D. Fiems S. Wittevrongel H. Bruneel
Department of Telecommunication and Information Processing (TELIN), Ghent University (UGent) St.-Pietersnieuwstraat 41,B-9000 Ghent,Belgium
国际会议
北京
英文
148-155
2010-07-24（万方平台首次上网日期，不代表论文的发表时间）