Allied-telesis AT-8326GB Manuel d'utilisateur télécharger pdf (Page 38)

AT-8326GB Installation Guide

How a switch signals an end node to stop transmitting data differs

depending on the speed and duplex mode of the end node and switch

port. A twisted pair port operating at 100 Mbps port and half-duplex

mode stops an end node from transmitting data by forcing a collision. A

collision on an Ethernet network occurs when two nodes attempt to

transmit data using the same data link at the same time. A collision

causes end nodes to stop sending data. When the switch needs to stop a

100 Mbps, half-duplex end node from transmitting data, it forces a

collision on the data link, which stops the end node. Once the switch is

ready to receive data again, the switch stops forcing collisions. This is

referred to as backpressure.

A twisted pair port operating at 100 Mbps and full-duplex mode uses

PAUSE frames, as specified in the IEEE 802.3x standard, to stop the

transmission of data from an end node. Whenever the switch wants an

end node to stop transmitting data, it issues this frame. The frame

instructs the end node to cease transmission. The switch continues to

issue PAUSE frames until it is ready again to receive data from the end

node. This is referred to as flow control.

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Allied-telesis AT-8326GB Manuel d'utilisateur Page 38