The number of bits in {TAIL ~ each submask} equates to the number of exit ports in {HEAD ~ fabrics} 602 and 604 
The number of bits in { TAIL ~ each submask } equates to the number of exit ports in { HEAD ~ fabrics } 602 and 604
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH