High-Speed Multi-Stage ATM Switch Based on Hierarchical Cell Resequencing Architecture and WDM Interconnection (Joint Special Issue on Photonics in Switching : Systems and Devices)
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概要
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This paper proposesd a non-blocking multi- stage ATM switch based on a hierarchical-cell-resequencing (HCR) mechanism and high-speed WDM interconnection and reports on its feasibility study. In a multi-stage ATM switch, cell-based routing is effective to make the switch non-blocking, because all traffic is randomly distributed over intermediate switching stages. But due to the multi-path conditions, cells may arrive out of sequence at the output of the switching fabric. Therefore, resequencing must be performed either at each output of the final switching stage or at the output of each switching stage. The basic HCR switch performs cell resequencing in a hierarchical manner when switching cells from an input-lines to a output-line. As a result, the cell sequence in each output of the basic HCR switch is recovered. A multi-stage HCR switch is constructed by interconnecting the input-lines and output-lines of these basic HCR switches in a hierarchical manner. Therefore, the cell sequence in each final output of the switching fabric is conserved in a hierarchical manner. In this way, cell-based routing becomes possible and a multi-stage ATIVI switch with the HCR mechanism can achieve 100% throughput without any internal speed-up techniques. Because a large-capacity multi-stage HCR switch needs a huge number of high-speed signal interconnections, a breakthrough in compact optical interconnection technology is required. Therefore, this paper proposes a WDM interconnection system with an optical router arrayed waveguide filter (AWCF) that interconnects high-speed switch elements effectively and reports its feasibility study. In this architecture, each switch element is addressed by a unique wavelength. As a result, a switch in a previous stage can transmit a cell to any switch in the next stage by only selecting its cell transmission wavelength. To make this system feasible, we developed a wide-channel-spacing optical router AWGF and compact TO-Gbit/s optical transmitter and receiver modules with a compact high-power electroabsorption distributed feedback (EA-DFB) laser and a new bit decision circuit. Using these modules, we confirmed stable operation of the WDM interconnection. This switch architecture and WDM interconnection system should enable the development of high- speed ATIVI switching systems that can achieve throughput of over 1 T bit/s.
- 社団法人電子情報通信学会の論文
- 1999-02-25
著者
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Kawano Ryuusuke
NTT LSI Laboratories
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Oki E
Department Of Information And Communication Engineering The University Of Electro-communications
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Oki Eiji
Ntt Netwok Service Systems Laboratories
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Yamanaka N
Faculty Of Science And Technology Keio University
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Yamanaka Naoaki
Department Of Information And Computer Science Faculty Of Science And Technology Keio University
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Yamanaka Naoaki
Ntt Netwok Service Systems Laboratories
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YASUKAWA Seisho
NTT Network Service Systems Laboratories
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KAWANO Ryusuke
NTT Network Service Systems Laboratories
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Oki Eiji
Dept. Of Communication Engineering And Informatics The University Of Electro-communications
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