HP 10Base-T Hub 24M Manual page 159

Configuration Reference
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In the Number of Packets to Send box, use the list box to select a number,
either 1, 5, 10, or 20, to indicate the number packets the hub should send
to the test device to determine whether a valid connection exists between
the two devices.
In the Timeout in Seconds field, type a number between 1 and 30 that
indicates the number of seconds you want the hub should wait for a
response to a test packet request from the target device.
Click the left mouse button on the Start button.