There are several different antennae on the belly of the airplane and a sat com sender/receiver on top, so a failure of just one would only affect that one radio/transponder. Everything is redundant, except the AIMS Cabinet, that's the weak link and it controls... everything!

We have 5 generators, 3 hydrolic systems, 6 fuel pumps, two in each tank, 2 pressurization systems, electronic engine controllers, three autopilots, two independent GPS/Nav systems, etc. but they all run through the E/E bay and AIMS cabinet, and it even has a 'dumb mode' to back up the normal mode...but if the whole thing catches on fire, or shorts out for some reason...not good!