Each switching module is also connected to {HEAD ~ the cross bar switch} 14 to receive {TAIL ~ packets} from the switching controllers 20, 23 and 25 
to receive
Each switching module is also connected to { HEAD ~ the cross bar switch } 14 to receive { TAIL ~ packets } from the switching controllers 20 , 23 and 25
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH