Canon EOS-1D X Manual

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You can use EOS Utility to shoot remotely over a wired 

LAN.

In addition to remote capture, almost all EOS Utility 

camera operations except firmware updating are 

supported, because this option utilizes a wired network 

instead of a USB cable.

Mac Versions of EOS Utility
The EOS-1D X’s wired LAN functions cannot be used in Mac OS X 
10.8.0 or 10.8.1.