Dell PowerConnect 3024 User Manual page 26

The History Chart charts one type of statistic for any combination of ports. The chart presents data across a set time period so that you can monitor
fluctuations over time.
Statistics — The type of system data to monitor
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Refresh Rate — The time interval between automatic refreshes
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Port Selection — The port for data to monitor
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Counter Reset
The Counter Reset page allows you to reset all statistics counters.
Utilization Summary
The Utilization Summary page allows you to view (by port) the link status; percent utilization; and ratios of incoming unicast, nonunicast, and error packets.
Click the Refresh button to refresh the Utilization Summary page.