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