{HEAD ~ The switching fabric} comprises a plurality of data ports through which data frames enter or exit {TAIL ~ the switching fabric} 
{ HEAD ~ The switching fabric } comprises a plurality of data ports through which data frames enter or exit { TAIL ~ the switching fabric }
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL