Allied Telesis AT-S39 - Manual (Page 200)

Section III: Web Browser Management
200
4. To create a port trunk, do the following:
a. Click the ports that will make up the port trunk. A selected port
changes to white. An unselected port is black. A port trunk can
contain 2, 3, or 4 ports.
b. Click Apply.
The new port trunk is immediately activated on the switch. You
can now connect the data cables to the ports of the trunk on the
switch.
5. To delete a port trunk, do the following:
a. Click the ports of the port trunk so that they change from white to
black.
b. Click Apply.
The port trunk is immediately deleted on the switch.