Dell Latitude D520 - Manual (Page 6)

USB connectors
modem connector (RJ-11)
network connector (RJ-45)
S-video TV-out connector
serial connector
video connector
AC adapter connector — Attach an AC adapter to the computer.
The AC adapter converts AC power to the DC power required by the computer. You can connect the AC adapter with your computer turned either on or off.
Connect USB devices, such as a mouse, keyboard, or printer. You can also
connect the optional floppy drive directly to a USB connector using the
optional floppy drive cable.
If you ordered the optional internal modem, connect the telephone line to
the modem connector.
For information on using the modem, see the online modem
documentation supplied with your computer. See
Finding Information for
information about accessing online user's guides.
NOTICE: The network connector is slightly larger than the modem connector. To avoid damaging the computer, do not plug a telephone line into the
network connector.
Connects the computer to a network. The two lights next to the connector
indicate the status of both the connection and the transfer of information
for wired network communications.
For information on using the network adapter, see the device user's guide
supplied with your computer. See
Finding Information .
Connects your computer to a TV. For more information, see Connecting
Your Computer to a TV or Audio Device .
Connects serial devices, such as a mouse or handheld device.
Connects an external monitor. For more information, see Using the
Display .