The study of voice transport on local area network

Pao Yue-kong Library Electronic Theses Database

The study of voice transport on local area network

 

Author: Wong, Tak-yuen George
Title: The study of voice transport on local area network
Degree: M.Sc.
Year: 1995
Subject: Local area networks (Computer networks)
Hong Kong Polytechnic University -- Dissertations
Department: Dept. of Electronic Engineering
Pages: viii, 86, [36] leaves : ill. ; 30 cm
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b1205040
URI: http://theses.lib.polyu.edu.hk/handle/200/3157
Abstract: Speech traffic is sent periodically with periods of typically 20 - 40 msec but occasionally as large as 100 msec. The packets carrying speech are of fixed length in most speech encoding techniques. The delay for voice packets cannot exceed 250 - 300 msec unless echo suppressors are used. No acknowledgement is needed for speech traffic. Traffic load is expected to be very heavy at peak hours in integrated LANs, unlike data networks which are usually underutilized. It is clear that many popular channel access protocols, such as CSMA/CD, are not suitable for integrating voice and data. In this MSc project, a protocol scheme in bounding the access delay of voice channels on the Local Area Networks with random access methodology, such as CSMA/CD, has been proposed. The focus of the proposed protocol scheme has been put on the Media Access Control (MAC) layer in IEEE 802.3 standard for resolving the collisions in random access after voice channels established. The main theme of this proposed scheme is to merge the concepts of time slotting and on-hook / off-hook registration with the random access characteristics for bus topology in LAN. Furthermore, the performance of this proposed idea has been analysed in two approaches : - Theoretical and Mathematical Analysis - Simulation (by SimScript II.5) The analysis has been emphasised on the throughput and access delay in the Local Area Network implementing the proposed protocol scheme. The results reflect the trade-offs between the bounded access delay in voice channels and performance in data channels on the Local Area Network.

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