Lenovo ThinkPad Edge E520 Hardware Maintenance Manual page 104

Cable routing: When you install the antenna assembly, route the cables as shown in the following figures.
As you route the cables, make sure that they are not subjected to any tension. Tension could cause the
cables to be damaged by the cable guides, or a wire to be broken.
For ThinkPad Edge E520 models
a : Wireless LAN AUX antenna (black)
b : Wireless WAN AUX antenna (blue)
c : Wireless WAN MAIN antenna (orange)
d
: Wireless LAN MAIN antenna (gray)
Note: Some models might have a third white cable for wireless LAN.
For ThinkPad Edge E525 models
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Hardware Maintenance Manual