Abstract:
The emerging Broadband Integrated Services Digital Networks (B-ISDN) will become the
core of the future telecommunication infrastructure based on the Asynchronous Trans-
fer Mode (ATM) technology and will provide a wide range of services such as as video
conferencing, video mail, image transfer, high de nition television, video on demand and video telephony. An important aspect of Broadband ATM networks is the multiplexing
of the multiple terminals (TEs) and diverse tra c types at the Customer Premises Net-
work (CPN). It is required that the access control within the CPN, connected to public
broadband ATM networks through a single User Network Interface (UNI), should reduce
the delay, delay variation, and the unfairness in their distribution. This is a major chal-
lenge due to the limitations of existing network technologies: the cyclic control in ring
technologies lead to large cell delay variation, while delay propagation leads to unfairness problem in reservation based networks. Various access control protocols based on the above technologies have been proposed to the International Telegraph and Telephones Consultative Committee (CCITT) and discussed for the last 3 years. However, it has been shown in recent studies that the four major problems, namely large delay, delay variability, cell clumping and the unfairness in their distribution, have not been satisfactorily solved by existing protocols. This research therefore aims to design and implement a multi-service access control protocol using the 4 bits of the generic
control (GFC) and reserved in ATM cell by CCITT, to overcome the problems outlined above. The protocol performance will be evaluated through simulation results, based on CCITT test criteria, and compared with the results of the known published existing GFC protocols.
