SYSTEM FOR MEASURING TRAFFIC USING VIRTUAL BUFFER IN ASYNCHRONOUS TRANSFER MODE MULTIPLEXER

摘要

PURPOSE: A system for measuring traffic using a virtual buffer in an ATM(Asynchronous Transfer Mode) multiplexer is provided to introduce a virtual buffer which is a monitoring buffer, to effectively detect a characteristic of multiplexing input traffic and correctly estimate the performance of the ATM multiplexer. CONSTITUTION: An ATM(Asynchronous Transfer Mode) multiplexer(1) has a buffer(4) for storing cells(3) doubly inputted from traffic sources(2). A monitoring buffer system(7) including a virtual buffer(8) has an input traffic load identical with that of the ATM multiplexer(1), and has a constant output transmission speed. Monitors(12-14) measure traffic variables, through an arrival time(Xi) of virtual traffic cells, the number(Ni) of arrived cells, and the number(Qn) of waiting cells inputted to the virtual buffer(8) of the monitoring buffer system(7). Counters(15-19) calculate distribution for the number of waiting cells, a moment for a cell arrival time interval and autocorrelation, or a moment for the number of cells arrived during a predetermined time.