The routing data identifies one of {TAIL ~ the plurality} of data ports through which {HEAD ~ the data frame} will exit the switching fabric to reach the destination device 
The routing data identifies one of { TAIL ~ the plurality } of data ports through which { HEAD ~ the data frame } will exit the switching fabric to reach the destination device
OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH