| 摘要 |
The present invention provides for an ATM switch for transferring ATM cells from input channels to output channels. The switch has a plurality of input and output ports, each connected to input and output channels respectively. The ATM switch also has a switch block connected between each one of the input ports and each one of the output ports to convey the cells from the input ports to the output ports, and a backpressure signal circuit. Each input port has an input buffer which holds cells which arrive faster from an input channel than the input port can transmit to the switch block, and each output port has an output buffer holding cells when the cells arrive faster from the switch block than the output port can transmit. The backpressure signal circuit sends a signal from a congested output buffer to those input port buffers which have transmitted a cell to the output buffer (during congestion) so that the input port buffers cease transmission. The cells destined for the output buffer are then stored in the input port buffers.
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