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A cooperation control between Look-ahead Buffer and Loop-back Buffer in two-stage variable optical packet Switch

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4 Author(s)
Hirota, Y. ; Grad. Sch. of Inf. Sci. & Technol., Osaka Univ., Suita, Japan ; Yatsuo, S. ; Tode, H. ; Murakami, K.

Programmable variable delay lines have been developed, so as to delay packets in variable durations by combining several lengths of FDLs in optical packet switch. In practice, two-stage switch with this programmable variable delay lines has been proposed. This switch has two buffers. One is the programmable variable delay lines (look-ahead buffer). The other is the fixed FDLs that re-input a packet from the output to the input (loop-back buffer). The switch can foresee following packets and avoid contentions effectively by using two buffers. However, existing studies only focus on the look-ahead buffer and intelligent usage of the loop-back buffer is actually out of concern. In this paper, a packet transfer scheduling method in the two-stage switch is proposed. The proposed method controls both the look-ahead buffer and the loop-back buffer cooperatively and improves the utilization of the switching process. The proposed method uses the loop-back buffer systematically and distributes traffics in the whole switch. The effectiveness of the proposed method is evaluated through simulation experiments.

Published in:

Optical Network Design and Modeling (ONDM), 2010 14th Conference on

Date of Conference:

1-3 Feb. 2010

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