ATM over ADSL: The “Best-Effort” PVC Provisioning for ATM Call Flow

Asymmetric digital subscriber line (ADSL) is the latest copper-wire access technology that has the capability to deliver data rate up to 8 Mbps in downstream and up to 640 kbps in upstream. The ADSL Forum has also defined the model for ADSL/ATM connections. ADSL can be connected to ATM core network through the access network called digital subscriber line access multiplexer (DSLAM). This paper is a compendium of research addressed on ATM over ADSL. Considering ATM over ADSL, a new method of “best-effort” specified bitloading algorithm is developed via HartleyShannon capacity considerations. The specific research tasks performed refer to provisioning permanent virtual channels for ATM specific calls on the ADSL access lines. Feasibility of including switched virtual channel is also considered. Relevant callblocking probabilities and bandwidth utilization are ascertained. Simulation results based on Poisson arrival of different classes (QoS specified) traffics, are obtained pertinent to the algorithms derived. The procedure allows a quick evaluation of blocking probabilities and the bandwidth utilizations involved. The relevant analytical pursuit is new and no comparable effort is addressed in the literature.