Copyright © (2007) by IEEE. Permission to make digital or hard copies of part or all of this work for personal or classroom use is granted without fee provided that copies are not made or distrubuted for profit. To copy otherwise, to republish, to post on servers, or to redistribute to lists, requires prior specific permission and/or a fee.
The Data Vortex photonic packet-switching architecture features an all-optical transparent data path, highly distributed control, low latency, and a high degree of scalability. These characteristics make it attractive as a routing fabric in future photonic packet switches. We analyze the performance of the Data Vortex architecture as a function of its height and angle dimensions, H and A. . The investigation is based on two performance measures: the average delay and the maximum throughput of the switch. We present an analytical model assuming uniform traffic and derive closed-form expressions for these measures. Our results obtained demonstrate that as H increases, the saturation throughput decreases and approaches 2/9 = 0.22 when A is small and H is large. Furthermore, for fixed switch size, the saturation throughput is maximized when A is minimal. We also present simulation results for the maximum throughput under uniform and nonuniform traffic, as well as for the mean number of hops and the mean input-queue packet delay as a function of input load, and address the issue of resequencing delay. The results obtained advocate that to support more ports, it is preferable to increase the height dimension and to keep the angle dimension as small as possible.
By: Ilias Iliadis, Nikolaos Chrysos, Cyriel Minkenberg
Published in: IEEE Journal on Selected Areas in Communications, volume 25, (no 6), pages 20 in 2007
LIMITED DISTRIBUTION NOTICE:
This Research Report is available. This report has been submitted for publication outside of IBM and will probably be copyrighted if accepted for publication. It has been issued as a Research Report for early dissemination of its contents. In view of the transfer of copyright to the outside publisher, its distribution outside of IBM prior to publication should be limited to peer communications and specific requests. After outside publication, requests should be filled only by reprints or legally obtained copies of the article (e.g., payment of royalties). I have read and understand this notice and am a member of the scientific community outside or inside of IBM seeking a single copy only.
Questions about this service can be mailed to reports@us.ibm.com .