The study of frame relay with voice applications

Pao Yue-kong Library Electronic Theses Database

The study of frame relay with voice applications


Author: Chiu, Sin-man Stephen
Title: The study of frame relay with voice applications
Degree: M.Sc.
Year: 1996
Subject: Frame relay (Data transmission)
Hong Kong Polytechnic University -- Dissertations
Department: Multi-disciplinary Studies
Pages: x, 91 leaves : ill. ; 31 cm
Language: English
InnoPac Record:
Abstract: Local Area Networks (LANs) connecting heterogeneous computers running on different operating systems are becoming more and more popular. Similarly, the number of different protocols traversing the LANs is also increasing. When these LANs are interconnected over a wide area, a backbone network must exist that allows simultaneous routing of more than one network layer protocol. Several alternative backbone technologies have been proposed to solve the above problem. The traditional ones include Time Division Multiplexing (TDM) and X.25. Newer ones include Frame Relay (FR) and Asynchronous Transfer Mode (ATM) for LAN interconnect applications. This project aims to study the theory and applications of frame relay. Like X.25, frame relay is a packet-oriented network access protocol. However, it uses only the physical layer and part of the data link layer. So frame relay relies on end-to-end protocols to perform retransmission and error recovery. Hence, there is less processing required at the network nodes and consequently less overall delay across the network. Simulation techniques have been used to study the performance of frame relay. COMNET IIITM is used in this project. It is a powerful communications-oriented simulation package that allows one to simulate a network with no programming required. Typical modelling constructs for network and telecommunication modules have been built, and parameters can be adjusted for each module. Based on the facility and restrictions of the simulation tool, studies have been carried out to evaluate the effects of frame size, access link speed and committed information rate (CIR) on frame delay. Congestions on frame relay are also evaluated. Voice over frame relay has attracted much attentions. The major obstacles to carry voice over frame relay are the variable delay and audio quality. Several schemes have been proposed to evaluate their performance on average voice delay and the spread of the voice delay. The schemes include the sharing of the DLCI, separate DLCIs, prioritization and segmentation. A strategy combining the advantages of the four schemes is proposed.

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