HP 10Base-T Hub 24M Manual page 137

Configuration Reference
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Primary Port. Indicates the number of the port on the hub. This port is
used during a standard connection of a hub and the connected device.
Backup Port. Indicates the number of the backup port on the hub.
Test Time (Seconds). Indicates the number of seconds allowed for the
primary port to wait for a response from its target device before timing
out and attempting a retry. The number can be between 1 and 15.
As a general rule, for connections of greater distances, slower media
throughput, and higher hop counts, the test time value should be higher
so more time can be allowed for a response.
Number of Failures till switching to backup. (Retries on the Browser
Interface) Indicates the limit of the number of times the hub does not
receive a response from test packets sent to its target device before the
hub disables the primary port and activates the backup link. The number
can be between 1 and 16.
Add New Backup Link Button. Begins a backup link add session.
Delete Selected Items Button. Restores all settings to values present
during the last session when settings were stored.