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Proceedings Paper

Flow analysis and control of the fiber channel/ATM interworking unit
Author(s): Masahiko Ohno
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Paper Abstract

This paper reports the design of the inter-working unit (IWU) required when high-speed information processing machines (hosts) communicate to each other by channel interface via the lower-speed wide area network (WAN). It formulates the relationship among the window size W, N of ACK_N (the acknowledgement returned for each N frames), ATM network utilization ratio RTP (relative throughput), required segmentation buffer size Bmax, and queue average delay Tw by analysis. The research target is the maximum enhancement of inherent host performance (throughput) up to the limit of the network bandwidth by new flow control It focuses 1.0625 Gbps fiber channel (FC) mounted on supercomputers, workstations, etc., and 622.08 Mbps ATM network. The report proposes ACK based flow control consists of pseudo ACK in order to fully utilize the network bandwidth independent from the network propagation delay, and ACK priority transmission to prevent queuing in full-duplex communication. It also discuses ACK registration in order to minimize required segmentation buffer size. At present, the prototype IWUs are being developed and basic function of FC through ATM transmission has already been verified in the laboratory test.

Paper Details

Date Published: 6 October 1997
PDF: 10 pages
Proc. SPIE 3233, Broadband Networking Technologies, (6 October 1997); doi: 10.1117/12.290471
Show Author Affiliations
Masahiko Ohno, Ultra-High Speed Network and Computer Technology Labs. (Japan)

Published in SPIE Proceedings Vol. 3233:
Broadband Networking Technologies
Seyhan Civanlar; Indra Widjaja, Editor(s)

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