Nope, CCAPI allows you to RTM wirelessly. This means that an ethernet cable is not needed, all you need to do to set it up is download the CCAPI package file (listed on this thread:
You must login or register to view this content.) and install it. Once installed simply find any RTM tool that is CEX compatible and connect to it using your PS3's IP address! If you've got any questions please feel free to ask.