Patent ID: 6067298
Filing Date: 2000-05-23
Classification: H04L,H04Q

Abstract:
An ATM switching system comprising:a switch section for storing an ATM cell into a buffer to implement an ATM cell exchange between an input port and an output port at a predetermined transmission rate;an input buffer module section having a buffer that multiplexes plural input/output lines with a transmission rate slower than said predetermined transmission rate to the input port of said switch section and then stores said ATM cell; anda buffer module section for separating an output from the output port of said switch section into plural output lines with a transmission rate slower than said predetermined transmission rate and then storing said ATM cell;said input buffer module section which enables queuing from said ATM cell to said buffer for each of the output lines and for each service class accommodated by said input buffer module section itself;said output buffer module section which enables queuing to said buffer for each destination output line and for each service class;said output buffer module section including:means for originating a cell inhibit signal to said switch section when the total occupancy of said buffer exceeds a predetermined threshold value;queues respectively placed for said output lines; andmeans for originating a cell inhibit signal to all said input buffer module sections when the length of each of said queues exceeds a predetermined threshold value;said switch section including:queues respectively placed for said output ports;means for originating a cell inhibit signal to all, said input buffer module section when each of said queues exceeds a predetermined threshold value; andhalt control means for halting a cell transmission to said output buffer module section to which said cell inhibit signal has originated;said input buffer module section including:halt control means for halting a cell transmission to said output port and said output line to which said cell inhibit signal is originated.