Lenovo ThinkPad T540p Hardware Maintenance Manual page 106

Cable routing:
When you install the antenna kit, route the cables as shown in the following illustration.
Attention: As you route the 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.
Antenna location
a Wireless LAN auxiliary antenna (black)
b Wireless WAN auxiliary antenna (blue)
c
Wireless WAN main antenna (red)
d Wireless LAN main antenna (grey)
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Hardware Maintenance Manual