參數(shù)資料
型號(hào): CONFERENCEPAPERREPRINT
英文描述: Conference Paper Reprint - Multimedia over FDDI (Paper)
中文描述: 會(huì)議文件再版-在FDDI(多媒體文件)
文件頁(yè)數(shù): 2/28頁(yè)
文件大小: 120K
代理商: CONFERENCEPAPERREPRINT
Multimedia Over FDDI
Amit Shah
1
,
Don Staddon
2
, Izhak Rubin
3
, Aleksandar Ratkovic
4
Advanced Micro Devices
1
, IBM
2
, IRI Corp. and UCLA
3
, IRI Corp. and UCLA
4
Abstract
This paper focuses on issues in multimedia networking
over FDDI and simulation results demonstrating the
feasibility of multimedia over FDDI. Previous work in this
field has concentrated on the asynchronous channel in
FDDI. Other examinations of the FDDI synchronous
channel have applied bursty traffic to the synchronous
channel. Multimedia traffic is typically stream oriented.
Our simulations were focused on simulating typical
configurations with a range of applications and traffic
models.
The advantages of FDDI as an integrated
voice/video/ data network are demonstrated.
1: Introduction
The paper is organized as follows.
A brief discussion on the basics of FDDI and
multimedia is followed by an overview of the various
multimedia applications and issues in networking of
multimedia applications such as voice and video. The
importance of parameters such as network delay, intra-
packet jitter, and bandwidth is highlighted.
The simulation models are discussed. The methodology
involved testing the effect of variations in TTRT, network
size, packet size, and offered load on the multimedia
streams of voice and video, using the IRI Planyst
tool.
Finally, the simulation results for running multimedia
over the FDDI synchronous channel are discussed. A
comparison of multimedia over FDDI synchronous and
asynchronous channels is made demonstrating the ability of
the synchronous channel to provide a near-constant latency
and bandwidth under various loads and configurations.
1.1: FDDI Basics
FDDI is a 100 Mbps high speed local area network
standard developed under the auspices of American
National Standards Institute (ANSI) X3T9.5 committee.
Unlike other LANs whose origins were proprietary
products, FDDI was developed by a group of people whose
interest was to create a reliable fault-tolerant, high-speed
network connecting numerous stations over greater
distances than existing standards. The ANSI X3T9.5
committee thus developed a specification for a network
based on a dual counter-rotating fiber optic ring using
timed-token protocol, which is capable of transmitting data
at 100 Mbps in each ring and which can extend to 500
stations over a total fiber length of 200 km with full system
performance.
The FDDI MAC supports multiple classes of service:
Synchronous, Asynchronous and Restricted Asynchronous.
The asynchronous class is used for normal, bursty data
traffic. For more constant, isochronous traffic, the
synchronous channel can be used and it provides
guaranteed bandwidth to each station on each token
rotation. The restricted asynchronous service provides a
mechanism for extended and protected dialog between a
limited number of stations. This feature is rarely used.
There have been several publications on FDDI [10],
[11], [12], [13], [14], [15], [16] which explain the protocol
in further detail.
2: Multimedia
Multimedia is a term used to denote a set of
applications, products, and technologies [1]. We define it
as the use of multiple means to communicate information
via a computer. Whereas computers today are mainly used
for textual data information presentation and storage,
multimedia uses the computer for text, natural and animated
images, rendered graphics, auditory stimuli and realistic
sound. There are two key components to multimedia:
multiple output media and interaction.
Television as we know it today exemplifies one of the
components of multiple output media; it delivers 'realistic'
pictures, animation and sound. However, the content of
what is viewed, and the way it is presented is largely
beyond the control of the user. The user interaction is
limited to turning on or off, switching channels, volume
control and some image control.
Personal computers demonstrate the other key concept
in multimedia: interaction. Unfortunately, most current
personal computers exploit only a limited number of media
such as text, graphics and a few sound tones. It is only now
that the personal computers' ability to present clearer,
sharper images is being exploited by multimedia
applications.
2.1: Multimedia applications
The concept of multimedia is only as interesting as the
applications it can support. It is the scope of multimedia
applications which is drawing such a tremendous response
from the information technology industries.
The various multimedia applications are shown in table
1 below.
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