| 摘要 |
A flow control method in an Ethernet switch being a downstream device using a full duplex mode in a packet switched network of the type having a plurality of input ports connected to a plurality of Ethernet switches being upstream devices and a common memory for storing packet data received from each input port and for transmitting packet data read from the common memory to a destination upstream device. In such flow control method, the buffer state of the common memory is first determined. If the buffer state is buffer-full, a pause frame including a predetermined pause time is transmitted to the plurality of Ethernet switches being upstream devices and an expected pause time of the upstream devices is counted. The buffer state of the common memory is determined again if the expected pause time expires. If the buffer state is buffer-full, the pause frame including the predetermined pause time is re-transmitted to the plurality of Ethernet switches being upstream devices and the expected pause time of the upstream devices is initiated.
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