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