Abstract: A buffer management system and method for use in an ATM switch that allows for data processing of variable bit rate (VBR) and constant bit rate (CBR) traffic using a common buffer memory. The buffer memory is broken down into data sub-queues, each of which is assigned an output and purge priority. ATM cells are allocated to a particular data sub-queue by matching the desired quality-of-service of the cells with the output and purge characteristics of each sub-queue. The system and method dynamically sizes the data sub-queues so as to be equal to the number of ATM cells in the data sub-queue. In addition, age and size ratio thresholds may be assigned to each data sub-queue to better distribute available bandwidth among the sub-queues, and to ensure that cells are not excessively delayed.

Abstract: A data protocol compatible with ATM data transmission systems that provides a frame format that allows for ATM cell transmission in a low speed, high noise link such as a radio link and further provides for reliable radio data communication in the ATM format through the provision of timing and control information. A TDMA implementation of the present protocol is suitable for reliable data communication between a single headend station and a plurality of mobile substations. The protocol format is such that simple and easy interconnection with standard ATM data communications systems can be made to allow for wide distribution of relevant data. The protocol is suitable for implementation in either software or low cost hardware.