The -777 uses the ARINC 629 buss and much of the equipment and LRU's are linked by twisted pair cables to carry the data. I think the failure of those cables is worth considering in terms of getting data to the satellite transceiver which keeps its connection whether or not it is getting data from the aircraft systems. Remember also that the cockpit VHF and HF control heads use the buss to connect to their LRU in the avionics bay.