DEVELOPMENT OF ENHANCED DIFFERENTIATED SERVICES MODEL OF CAMPUS INTERNET NETWORK: A CASE STUDY OF AHMADU BELLO UNIVERSITY, ZARIA

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Department of Engineering

ABSTRACT
Modern campus networks are designed for high-speed service with the capacity to handle many organization's bandwidth requirements, support data applications such as electronic-mail, web and files sharing services. These networks sometime lack the capacity to guarantee quality of service for voice, video and other interactive applications due to bandwidth requirement and high packet end-to-end delay. In some networks, voice, video and other interactive packets must be given priority in terms of bandwidth and delay over less-time-sensitive packets such as mail or file sharing for the networks to meet the QoS demand of these voices, video and other interactive applications. In this research, best-effort service model currently employed in Ahmadu Bello University (ABU) Internet network and differentiated services networking model define in RFC 2474 were analyzed. Enhanced differentiated services model was developed to improve and achieve better reduction in packet end-to-end delay of interactive traffic such as video conferencing and voice streaming in networks. The simulation results obtained of simulation of the three services model showed that enhanced differentiated services model with mean packet end-to-end of 0.10481s has 26% delay reduction as compared with differentiated services model with mean packet end-to-end of 0.10757s. The enhanced differentiated services model has 32% delay reduction as compared to the best-effort services model with mean packet end-to-end of 0.15417s. Similarly, validation results obtained of mean delay of the enhanced differentiated services model performed better than the differentiated services model by and better than the best-effort services model by 83%. These results demonstrate the superiority of the enhanced differentiated service to differentiated service and best-effort services models in reduction of packet end-to-end delay of a network.