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Rear view
Figure 5. ThinkPad T420/T420i rear view.
1 Modem connector or IEEE 1394
2 Always On USB connector (rear)
3 Power jack
4 Fan louvers (rear)
1 Modem connector or IEEE 1394
• If your computer has a modem connector, connect your computer to a telephone line with the modem
connector. For details, refer to the instructions in “Dialup connections” on page 68.
• If your computer has an IEEE 1394 connector, which is used for connecting devices that are compatible
with the IEEE 1394 interface, such as digital video cameras and external hard disk drives.
Note: Depending on your model, your computer might have neither modem connector nor IEEE 1394
connector.
2 Always On USB connector (rear)
The Always On Universal Serial Bus connector is used for connecting devices compatible with a USB
interface, such as a printer or a digital camera.
By default, even if your computer is in sleep (standby) mode, the Always On USB connector still enables
you to charge some devices, such as iPod
®
, iPhone, and BlackBerry
®
smartphones, by attaching the
devices to the connector.
However, with the ac power adapter attached, if you want to charge these devices when your computer
is in hibernation mode or powered off, you will need to open the Power Manager program and congure
corresponding settings to enable the Always On USB connector function. For details about how to enable
the Always On USB connector function, refer to the on-line help of the Power Manager program.
Note: Your computer is compatible with USB 1.1 and 2.0.
3 Power jack
The ac power adapter cable connects to the computer power jack to provide power to the computer and
charge the battery.
10 User Guide