AES 50 "supermac" is not TCP/IP data. The only thing in common is the Physical Layer, i.e. the use of 4 pair network data cabling. The shield is required because Music Group's design is not the same as the original Midas/KT AES50 design used the DL21xx, DL2xx, DL4xx stage boxes (which run happily on UTP) and ESD will cause loss of word clocking between the i/o boxes and the M/X32. Nasty POP, a half second or so of no audio while the clocks sync back up. In this use the shield has nothing to do with radiated energy escaping the cable or entering it over the run... it's about avoiding the nasty noise and embarrassing interruption.