Scalable-distributed-arbitration ATM switch supporting multiple QoS classes

Eiji Oki, Naoaki Yamanaka, Masayoshi Nabeshima

Research output: Contribution to conferencePaperpeer-review

1 Citation (Scopus)


This paper proposes a multi-QoS scalable-distributed-arbitration (MSDA) ATM switch that supports both the high-priority class and the low-priority class under the head-of-line-priority discipline. It has a crosspoint buffer and a transit buffer, each consisting of a high-priority buffer and a low-priority buffer. Arbitration is executed between the crosspoint buffer and the transit buffer in a distributed manner. The MSDA switch extends the advantage of our previously proposed single-QoS scalable-distributed-arbitration (SSDA) switch. It is expandable while permitting high output-line speeds due to the distributed arbitration. The SSDA switch has a problem when its delay-time-based cell selection mechanism is applied to the low-priority class due to the limitation of the number of bits for the delay measure in the cell overhead. We solved this problem by introducing a distributed-ring-arbiter-based cell selection mechanism at each crosspoint for the low-priority class. The low-priority transit buffer at each crosspoint has virtual queues in accordance with the upper input ports. Cells for the low-priority class are selected by distributed ring arbitration among the low-priority crosspoint buffer and the virtual queues at the low-priority transit buffer. Simulations confirm that the MSDA switch ensures fairness in terms of delay time for the high-priority class, while it ensures fairness in terms of throughput for the low-priority class.

Original languageEnglish
Number of pages6
Publication statusPublished - 1999 Jan 1
Externally publishedYes
EventProceedings of the 1999 5th IEEE ATM Workshop 'Opening the New Horizons toward Global Multimedia Services' - Kochi, Jpn
Duration: 1999 May 241999 May 27


OtherProceedings of the 1999 5th IEEE ATM Workshop 'Opening the New Horizons toward Global Multimedia Services'
CityKochi, Jpn

ASJC Scopus subject areas

  • General Engineering


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