Patent ID: 6226265
Filing Date: 2001-05-01
Classification: H04L

Abstract:
A packet flow monitor and control system for monitoring a flow of fixed-length packets into a network routing fixed-length packets, comprisingfirst usage parameter control means for setting a first monitor rate, and monitoring the flow of the fixed-length packets using the first monitor rate;second usage parameter control means for setting a second monitor rate, and monitoring the flow of the fixed-length packets using the second monitor rate;switch means for validating either of said first and second usage parameter control means to make it monitor the flow of fixed-length packets, entering the other of said usage parameter control means into a wait state, and alternately switching states of said first and second usage parameter control means between a valid state and the wait state;setting means for receiving the monitor rate from the network, calculating a transfer rate of a fixed-length packet transmitted by a transmitting terminal, and setting a lower rate of the monitor rate and the transfer rate as a next monitor rate, in said first or second usage parameter control means in a wait state; andcomparison means for making a comparison between the monitor rate set in said first or second usage parameter control means in a valid state, and the next monitor rate set by said setting means, wherein:said switch means immediately switches the valid state and the wait state of said first and second usage parameter control means if the next monitor rate is higher than the monitor rate set in said first or second usage parameter control means in a valid state, and switches the valid state and the wait state of said first and second usage parameter control means after a predetermined time elapses if the next monitor rate is lower than the monitor rate set in said first or second usage parameter control means in a valid state.