Scalable multi-stage cell-switching architecture: OPTIMA

Seisho Yasukawa, Eiji Oki, Kohei Nakai, Naoaki Yamanaka

Research output: Contribution to journalArticle


An architecture is described for a switch that is suitable for future large-scale packet-convergence networks. This optically interconnected multi-stage ATM switch architecture (OPTIMA) is a multi-stage switch architecture, and an OPTIMA switch can perform two types of QoS switching. The architecture is scalable - switching capacity can be expanded by interconnecting identical unit switches, without causing degradation in switching performance, because of the switch's route-control mechanism for high-priority traffic and its self-load balancing mechanism for low-priority traffic. Analysis and simulation demonstrated that an OPTIMA switch has high-performance switching capability. Also described is the hardware architecture for the 640 Gbit/s OPTIMA switching system. The OPTIMA switch is suitable for use as a backbone node in future packet-convergence networks.

Original languageEnglish
Pages (from-to)706-712
Number of pages7
JournalNTT R and D
Issue number12
Publication statusPublished - 2000 Dec 1
Externally publishedYes

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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  • Cite this

    Yasukawa, S., Oki, E., Nakai, K., & Yamanaka, N. (2000). Scalable multi-stage cell-switching architecture: OPTIMA. NTT R and D, 49(12), 706-712.