HP 10Base-T Hub 24M Manual page 139

Configuration Reference
8.
9.
Figure 6-35. The Backup Links Configuration Window
6-82
From the Retries box, type the number of times you will allow the port to
time out during test packet transmissions because of no response from
the remote device before being disabled.
Press the Apply Changes Button.
Remember that this is
the MAC address of the
device being tested for
a reachable link.