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Viewing Device Properties 37
9 Click the ATU Table button to make changes to the NJ220’s ATU table. The screen
you see allows you to display all MAC addresses that have been plugged into that
IntelliJack or just the ones that you have “locked down” to it. You can refresh the
list, add MAC addresses to it, edit existing ones or delete entries in the ATU table.
The Address Translation Unit (ATU) performs MAC address searching, learning,
and aging functions for all ports of the NJ220 IntelliJack. By default, the ATU table
allows a total of 512 entries and an aging time is 304 seconds for each entry.
The NJ220 IntelliJack lets you manage its ATU table. You may want to know
which MAC addresses have been plugged into a particular IntelliJack. You may
want to associate a MAC address with selected ports, so the unselected ports will
not receive frames from this MAC address. You may want to set a certain priority
level to the frames associated with the MAC address. Finally, you may want to
lock down a MAC address so that it is never dropped from the ATU table. This
last operation is referred as MAC address filtering and you can lock down up to 32
MAC addresses into the ATU. All of these configurations are handled through the
Properties page, since an ATU table is related to a specific IntelliJack.