The data is transmitted over {TAIL ~ a return channel} that is established over the satellite to a hub; the hub has {HEAD ~ connectivity} to a packet switched network 
The data is transmitted over { TAIL ~ a return channel } that is established over the satellite to a hub ; the hub has { HEAD ~ connectivity } to a packet switched network
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH