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