Lenovo ThinkPad X230 Tablet - Manual (Page 114)

c Wireless LAN antenna, MAIN (gray)
d Wireless WAN antenna, MAIN (red)
e Wireless LAN antenna, 3rd (white) (available on some models)
Attention: As you route the antenna cables, ensure that they are not subject to any tension. Tension could
cause the cables to be damaged by the cable guides, or a wire to be broken.
108 Hardware Maintenance Manual