Ethernet switching : a cost-effective approach to support multimedia applications

Pao Yue-kong Library Electronic Theses Database

Ethernet switching : a cost-effective approach to support multimedia applications


Author: Pong, Derek Siu-cheun
Title: Ethernet switching : a cost-effective approach to support multimedia applications
Degree: M.Sc.
Year: 1997
Subject: Ethernet (Local area network system)
Packet switching (Data transmission)
Hong Kong Polytechnic University -- Dissertations
Department: Multi-disciplinary Studies
Pages: viii, [76] leaves : ill. ; 30 cm
Language: English
InnoPac Record:
Abstract: The objective of this project is to study the feasibility of deploying Ethernet switching to support real-time multimedia traffic. We will discuss various switch features such as cut-through switching, internally nonblocking switch fabric architecture and high-speed switch fabric, all of which help provide a high bandwidth and low latency network. In this study, we also propose a priority control scheme - the two-class switch level priority scheme, which prioritizes traffic at the switch port level. The major advantages of the scheme are that it is simple to implement and does not require to modify the current Ethernet protocol. We have carried out a set of simulation experiments to support our conclusion. The performance measures include the average packet delay, the percentage of multimedia packet missing their deadlines, standard deviation of the packet delay and the observed maximum buffer length at the switch. The simulation results have shown that there is an immediate performance gain in using Ethernet switches instead of a single segment. However, dedicated connections between multimedia stations and switch ports are required. For multimedia communication across two switches, traffic contention occurs at the interswitch port and it causes input buffer overflow and a significant drop of packets. A high speed switch fabric can help relieve the input buffering problem but it may then cause output buffer overflow at the interswitch port. Our proposed priority scheme categories the packets into two classes and queues them into separate buffers at the interswitch port. A higher priority is given to the buffer holding multimedia packets. Consequently, we have obtained good performance for the multimedia transmission on high-speed switches even at heavy load at the interswitch port.

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