Allied Telesis AT-FS970M Series - Manual (Page 70)

Chapter 4: Setting Port Parameters
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A cell represents 128 bytes. The range is 1 to 7935 cells. The
default value is 7935 cells.
 Flow Control Status— Enable or disable the flow control feature.
By default, flow control is disabled on the port.
 Flow Control Limit (1 - 7935)— Set the threshold level for flow
control on the port. Enter the number of cells for flow control. A cell
represents 128 bytes. The range is 1 to 7935 cells. The default
value is 7935 cells.
6. To set the port to the default port value, click Default. Otherwise skip
this step.
7. Click Apply.
8. Click SAVE to save your changes to the startup configuration file.