Design of an ATM Shaping Multiplexer withGuaranteed Output

In order to utilize network resources eeectively while providing satisfactory quality of service (QoS) to all users on the ATM network, it is necessary to control users' traac at the network edges. ATM traac may be controlled at the User-Network Interface (UNI) and Inter-Network Interface (INI) based on the traac contracts. We propose an ATM shaping multiplexer along with its implementation architecture for all ATM traac connections multiplexed in an output stream. These connections are to be strictly regulated by the so-called Generic Cell Rate Algorithm (GCRA). When ATM streams conforming to the GCRA are multiplexed together, contention can disturb the streams such that they are no longer in conformance. Thus, a departure event driven traac shaping (DEDTS) algorithm is adopted to shape the cell streams in such a way that the outgoing ATM stream of each individual connection conforms to the ATM traac descriptors, Peak Cell Rate (PCR), Sustainable Cell Rate (SCR), Cell Delay Variation Tolerance (CDVT), and Burst Tolerance (BT) declared in the traac contract. A proposed architecture can be implemented to support up to thousands of virtual connections using oo the shelf components.