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Proceedings Paper

Transmitting time-dependent multimedia data in FDDI networks
Author(s): Cheng-Chew Lim; L. Yao; Wei Zhao
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Paper Abstract

Timely delivery of multimedia data is one of the key requirements in a distributed multimedia system. In a token ring network, this can be achieved by a proper control of channel access. FDDI uses a timed token MAC protocol to control the token rotation time. During network initialization, a protocol parameter called target token rotation time (TTRT) is determined. Its value indicates the expected token rotation time. Each node is assigned a fraction of the TTRT, known as synchronous bandwidth, for transmitting its synchronous messages which may be deadline constrained. In this paper, we study methods used for setting the protocol parameters such as TTRT and synchronous bandwidth. The goal is to satisfy the message deadlines. In particular, we discuss the use of the normalized proportional scheme for allocating the synchronous bandwidth. We derive a condition on the utilization factor for ensuring timely delivery of all synchronous messages, and show that 33% utilization is the tight lower bound, regardless of the number of nodes, message lengths, periods, etc. Based on this scheme, we address proper selection of TTRT and trade-off between buffer size and the capability of meeting message deadlines.

Paper Details

Date Published: 20 January 1993
PDF: 11 pages
Proc. SPIE 1785, Enabling Technologies for High-Bandwidth Applications, (20 January 1993); doi: 10.1117/12.139255
Show Author Affiliations
Cheng-Chew Lim, Univ. of Adelaide (Australia)
L. Yao, Univ. of Adelaide (Australia)
Wei Zhao, Texas A&M Univ. (United States)

Published in SPIE Proceedings Vol. 1785:
Enabling Technologies for High-Bandwidth Applications
Jacek Maitan, Editor(s)

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