3Com 3CRWX120695A Reference Manual page 457

Accessing Realtime Performance Statistics 457
Viewing Historical Data
To see historical performance data in a graph, click the History tab.
Graphing starts when you click the tab and is based on the polling
interval you selected.
To see details for historical data You can see historical data for the
objects in the scope you selected. For example, if you selected a Mobility
Domain as the scope, you can see historical data for the Mobility Domain,
WX switches in the Mobility Domain, or WX ports.
To see the objects available in the scope, click the button next to Select
Detail (the button text depends on what scope you selected), and select
the object whose historical data you want to see.
To hide the list of objects that you can graph, click Hide Object Selector.
This allows you to see the graph in the full width of the Statistics tab in
the View panel.
Figure 14 shows the historical data in delta values for the 30 minutes
between 15:20:14 and 15:30:24. If the polling interval is 60 seconds, the
graph is refreshed every 60 seconds, but the Time axis always spans 30
minutes.