Lenovo ThinkPad L421 (English) User Guide - Page 140
Rear view, is for connecting an external monitor.
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Rear view ThinkPad Port Replicator Series 3 1 The power jack is for connecting the ac power adapter. 2 The Ethernet connector is for connecting the ThinkPad Port Replicator 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. Note: If you attach your computer to the ThinkPad Port Replicator Series 3 and use an Ethernet connector, use the Ethernet connector on the ThinkPad Port Replicator Series 3, not the one on the computer. 3 The Universal Serial Bus connectors are for connecting USB 1.1 and USB 2.0 devices. 4 The external monitor connector is for connecting an external monitor. Note: If you attach your computer to the ThinkPad Port Replicator Series 3 and use an external monitor connector, use the external monitor connector on the ThinkPad Port Replicator Series 3, not the one on the computer. 5 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 Port Replicator Series 3. 122 User Guide