IBM X23 - Manual (Page 78)

1110 Wirelesslan assembly for X22, X23,
X24
v Battery pack (1010)
v Keyboard assembly (1050)
22
m
m
10m
m
1
2
Step Antena Color Wireless LAN Board
1 Gray Color Main (J1)
2 Black Color Aux (J2)
74 ThinkPad X20, X21, X22, X23, X24