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