FLOW CONTROL METHOD IN ATM SWITCH OF DISTRIBUTED CONSTITUTION

摘要

PROBLEM TO BE SOLVED: To avoid the danger of causing congestion in a management module by distributing the (n) pieces of shapers adjusted as the function of a total average transmission speed dedicated to the flow of a VBRnrt category and the n-1 pieces of the shapers adjusted as the function of the available transmission speed of an output port dedicated to ABR and UBR category flow to respective input line cards. SOLUTION: On the respective input line cards 7i, the shapers 91 -9n are executed. One shaper is dedicated to the real time of the category VBRnrt (non real time variable transmission speed). The transmission speed of the shaper is adjusted as the function of the total average speed of the VBRnrt flow. The fixed number n-1 pieces of the shapers dedicated to the UBR (unspecified transmission speed)/ABR (available transmission speed) flow are adjusted as the function of the AvCR (available speed) of the output port. An operation range for featuring the value of the transmission speed achievable by the shaper is allocated to the respective UBR/ABR shapers identified by the number.