Lenovo ThinkPad T420 4236 User Manual page 178

ThinkPad Mini Dock Series 3
1 The power jack is for connecting the ac power adapter.
2
The DisplayPort is for connecting a display device.
3 The digital visual interface connector is for connecting a monitor that supports Single-Link DVI.
Note: The DVI connector provides a digital interface only. This connector can be used with a computer that
supports DVI via docking only.
4 The headphone jack, a jack 1/8 inch (3.5 mm) in diameter, is for connecting an external stereo headphone.
5 The microphone jack, a jack 1/8 inch (3.5 mm) in diameter, is for connecting an external microphone.
6 The Ethernet connector is for connecting the ThinkPad Mini Dock Series 3 to an Ethernet LAN. The
indicator on the connector is the same as that on the computer.
Notes:
• You cannot use the Token Ring cable for this connector.
• You can use this connector for a 10BASE-T/100BASE-TX/1000BASE-T Ethernet.
If you attach your computer to the ThinkPad Mini Dock Series 3 and use an Ethernet connector, use the
Ethernet connector on the ThinkPad Mini Dock Series 3, not the one on the computer.
7 The Universal Serial Bus connectors are for connecting USB 1.1 and USB 2.0 devices.
8 The external monitor connector is for connecting an external monitor.
Note: If you attach your computer to the ThinkPad Mini Dock Series 3 and use an external monitor connector,
use the external monitor connector on the ThinkPad Mini Dock Series 3, not the one on the computer.
9 When you attach a mechanical lock to the security keyhole, the eject button is locked so that the
computer cannot be removed from the ThinkPad Mini Dock Series 3.
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User Guide