{TAIL ~ The buffer} receives {HEAD ~ a data frame} to be transmitted to a destination device via the switching fabric 
{ TAIL ~ The buffer } receives { HEAD ~ a data frame } to be transmitted to a destination device via the switching fabric
TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH