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