D-Link DES-2218 - Manual (Page 24)

12 External Features
Rear Panel
♦
Cooling Fans Used to control the temperature within the switch’s
enclosure. When installing the switch, be sure not to block the fan
openings or otherwise restrict airflow.
♦
MII Port Used for connecting Fast Ethernet transceivers, which can
be used for attaching other Fast Ethernet media such as 100BASE-FX
(fiber optic) or 100BASE-T4 (4-wire twisted pair).
The MII port is shared with Port 2. If you are using the MII port, then
the 10BASE-T/100BASE-TX port labeled 2x cannot be used.
♦
Power Connector Used for connecting the power cord.
♦
Power Switch Used to turn the switch on (1 position) or off (0
position).