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    National Tsing Hua University Institutional Repository > 研究中心 > 電腦與通訊科技研發中心 > 技術報告 >  Feedforward SDL constructions of output-buffered multiplexers and switches with variable length bursts


    Please use this identifier to cite or link to this item: http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/13075


    Title: Feedforward SDL constructions of output-buffered multiplexers and switches with variable length bursts
    Authors: Chen,Yi-Ting
    Chang,Cheng-Shang
    Cheng,Jay
    Lee,Duan-Shin
    Huang,Chih-Cheng
    教師: 張正尚
    Date: 2007
    Publisher: Institute of Electrical and Electronics Engineers Inc.
    Relation: INFOCOM 2007. 26th IEEE International Conference on Computer Communications. IEEE,6-12 May 2007,Page(s) 679 - 687
    Keywords: multiplexing
    optical burst switching
    optical fibre networks
    optical switches
    packet switching
    Abstract: © 2007 Institute of Electrical and Electronics Engineers-In this paper, we study the problem of exact emulation of two types of optical queues: (i) N-to-1 output-buffered multiplexers with variable length bursts, and (ii) NxN output-buffered switches with variable length bursts. For both queues, the delay of a packet (in a burst) is known upon its arrival. As such, one can emulate such queues by finding a delay path that yields the exact delay for each packet. For emulating the delay of a packet in such queues, in this paper we consider a multistage feedforward network with optical crossbar Switches and fiber Delay Lines (SDL). For any fixed delay d, there exist multiple delay paths in such a network. A delay path is feasible if it satisfies the following three constraints: (i) conflict constraint: no more than one packet can be scheduled at the same input/output ports of each crossbar switch at the same time, (ii) causality constraint: no packet can be scheduled before its arrival, and (iii) strong contiguity constraint: packets in the same burst should be routed through any fiber delay lines contiguously. By the worst case analysis, we find sufficient conditions for the numbers of delay lines needed in each stage of such a feedforward network to achieve exact emulation of both queues. For N-to-1 output-buffered multiplexers, our sufficient conditions are also necessary when each burst contains exactly one packet. By computer simulation, we also show that the number of delay lines in each stage can be greatly reduced due to statistical multiplexing gain. ©2007 IEEE.
    Relation Link: http://www.ieee.org/portal/site
    URI: http://nthur.lib.nthu.edu.tw/handle/987654321/13075
    Appears in Collections:[電腦與通訊科技研發中心] 技術報告
    [通訊工程研究所] 會議論文
    [電腦與通訊科技研發中心] 會議論文
    [資訊工程學系] 會議論文

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