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Distributed multimedia applications have created a need for
support of QoS guarantees for continuous media such as audio and
video over local area network. Among various architectures of
LAN, Ethernet has been the dominantone and we believe that it
will continue to be popular in the future for itscost-
effectiveness. Nevertheless, Ethernet is unable to carry time-
constrainedmultimedia data because of its lack of bandwidth
guarantees. In order to provideQoS guarantees over Ethernet,
access to the underlying network medium has tobe deterministic.
In this thesis, we present the design and implementation ofa
software-based scheme called Periodic Token that makes it
possible to transmitreal-time data in Ethernet. Periodic Token
scheme is implemented totally in software and thus doesn't need
to rely on any special network hardware.
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