| Author | Undugodage, Salitha Priyanka |
| Call Number | AIT Thesis no. TC-96-10 |
| Subject(s) | Ethernet (Local area network system)
|
| Note | A thesis proposal submitted in partial fulfillment of the requirements for the degree of Masters
of Engineering, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Abstract | LANs are becoming strategic elements of computer based work environment. Due to
increases in processing power and storage capacity, today's computers have the ability to
handle high quality multimedia applications. But with the limited operational speeds and
medium access techniques, traditional local area networking technology is inadequate to handle
the resources demanding for such applications. The delay experienced in a traditional LAN has
always being a constraint and had led to a need for higher speed networks. Fast Ethernet is
considered to be one of the emerging technologies in high speed networking environment.
lOOBase-T is a well known Fast Ethernet which is simply an extension of CSMA/CD based
Ethernet technology. The other known Fast Ethernet is I OOBase-VG which uses a different
transmission method known as Demand priority. The advantages over CSMA/CD is it
eliminates collision and provides priority for real time sessions in multimedia. But complete
change over from CSMA/CD based technology in local area networking is considered to be
harmful in the development of a cost effective networking solution for multimedia applications.
In this research we propose a dual medium access Fast Ethernet LAN based on both
CSMA/CD and a Token reservation protocols. This design not only provides fixed and
bounded delay for real time sessions, but also improves the performance of non real time
traffic. The design features a hybrid mode of operation where the medium access techniques
switches in to three different modes, according to the types of traffic available. When there is
no real time sessions the operation mode is known as No request mode. In this mode both
networks are based on CSMA/CD decentralized medium access scheme. When the first real
time session arrives the mode of operation switches in to a mode known as Normal request
mode. With this mode one of the networks operate based on Token reservation protocol with a
centralized medium access scheme, giving necessary bandwidth for real time sessions on
request. When the bandwidth requirement for real time sessions exceeds a defined admission
control policy, the mode of operation switches in to a mode known as High request mode. In
this mode both networks are based on Token reservation centralized medium access scheme.
An admission control policy is defined to control the bandwidth occupied by real time sessions
to ensure better performance for non real time traffic. All these modes of operation are then
evaluated based on a computer simulation |
| Year | 1996 |
| Type | Thesis |
| School | School of Engineering and Technology (SET) |
| Department | Department of Information and Communications Technologies (DICT) |
| Academic Program/FoS | Telecommunications (TC) |
| Chairperson(s) | Chindakorn Tuchinda |
| Examination Committee(s) | Makelainen, Kimmo;Yulu, Qi |
| Scholarship Donor(s) | DAAD (Federal Republic of Germany)
|
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1996 |