Dell Latitude X1 - Manual (Page 5)

Right View
CompactFlash card slot — The CompactFlash card slot supports one CompactFlash card. Use CompactFlash cards to save or back up data.
USB 2.0 connector
network connector (RJ-45)
modem connector (RJ-11)
Attach headphones or speakers to the connector.
Attach a microphone to the connector.
1 CompactFlash card slot
2 USB connector
3 network connector
4 modem connector
5 power button
Connects USB 2.0 compliant devices that require power from the USB port.
NOTICE: The network connector is slightly larger than the modem connector. To avoid damaging the computer, do not plug a telephone line in to the
network connector.
Connects the computer to a network. The lights next to the connector indicate activity for wired network communications.
For information on using the network adapter, see the online network-adapter documentation supplied with your computer.
Connects the telephone line to the modem connector, if you ordered the optional internal modem.
For information on using the modem, see the online modem documentation supplied with your computer.