[video] Build A Super Long TTL Cord Using Ethernet Cables
YouTube member Matthewrichey made a short video describing the process which is worth checking out.
If you are more proficient with a credit card than a cable RJ45 plug crimper you can get a pretty long (10m) TTL cord for about $36 at your friendly online book store.
If any of you folks out there had a try, I would love to hear how long you got your cable before commands to the strobe stopped working.
Lastly, if you wondered why you would need a long TTL cord, check out Syl Areana's super smart way of using a Canon TTL master strobe inside a softbox to control other Canon strobes OR David Hobby's Strobe on a Rope self-assist way of off camera flashing.