TRENDnet TE100 S810Fi - Manual (Page 66)

6. Click add
5-4-6-3. Port Security
A port in security mode will be “locked” without permission of address
learning. Only the incoming packets with SMAC already existing in the
address table can be forwarded normally. User can disable the port from
learning any new MAC addresses, then use the static MAC addresses
screen to define a list of MAC addresses that can use the secure port.
Enter the settings, then click Submit to apply the changes on this page.
5-4-6-4. MAC Filtering