Lenovo ThinkPad T420 (English) User Guide - Page 25
Left-side view, ThinkPad Mini Dock Plus Series 3, not the one on - ports
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Left-side view Figure 3. ThinkPad T420/T420i left-side view 1 Fan louvers (left) 3 Ethernet connector 5 USB connector (left) 2 Monitor connector 4 DisplayPort connector 6 Smart card slot 1 Fan louvers (left) The internal fan and louvers enable air to circulate in the computer and cool the central processor. Note: To avoid impeding airflow, do not place any obstacle in front of the fan. 2 Monitor connector You can attach an external monitor or a projector to your computer to display computer information. Note: If you attach your computer to the ThinkPad Port Replicator Series 3, ThinkPad Mini Dock Series 3, ThinkPad Mini Dock Plus Series 3, and ThinkPad Mini Dock Plus Series 3 (170 W) and use a monitor connector, use the monitor connector on the ThinkPad Port Replicator Series 3, ThinkPad Mini Dock Series 3, ThinkPad Mini Dock Plus Series 3, and ThinkPad Mini Dock Plus Series 3 (170 W), not the one on the computer. For details, refer to the instructions in "Attaching an external monitor" on page 70. 3 Ethernet connector Connect your computer to a LAN with the Ethernet connector. DANGER To avoid the risk of electrical shock, do not connect the telephone cable to the Ethernet connector. You can only connect an Ethernet cable to this connector. Chapter 1. Product Overview 7