Lenovo ThinkPad T420 (English) User Guide - Page 257
Wireless LAN and WiMAX combo antenna Auxiliary
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If your computer comes with a wireless WAN feature, its transmitter antenna is located at the top left portion of the computer display. 3 Wireless LAN antenna (Third) If your computer has the Multiple Input Multiple Output (MIMO) wireless LAN feature, the third wireless antenna is located at the top right portion of the computer display, near center. 4 Wireless LAN and WiMAX combo antenna (Auxiliary) The auxiliary antenna connected to the wireless LAN or WiMAX feature is located at the top right portion of the computer display. 5 Wireless WAN antenna (Auxiliary) If your computer comes with a wireless WAN feature, the auxiliary antenna is located at the top right corner of the computer display. Type 2: Antenna location 1 Wireless LAN and WiMAX combo antenna (Main) The main antenna connected to the wireless LAN or WiMAX feature is located at the top left corner of the computer display. 2 Wireless WAN antenna (Main) If your computer comes with a wireless WAN feature, its transmitter antenna is located at the top left portion of the computer display. 3 Wireless WAN antenna (Auxiliary) If your computer comes with a wireless WAN feature, the auxiliary antenna is located at the top right portion of the computer display. 4 Wireless LAN antenna (Third) If your computer has the Multiple Input Multiple Output (MIMO) wireless LAN feature, the third wireless antenna is located at the top right portion of the computer display, near center. 5 Wireless LAN and WiMAX combo antenna (Auxiliary) The auxiliary antenna connected to the wireless LAN or WiMAX feature is located at the top right corner of the computer display. Appendix A. Regulatory information 239