wherein {TAIL ~ the lower level bus system} uses {HEAD ~ a unique protocol} instead of an Ethernet protocol 
wherein { TAIL ~ the lower level bus system } uses { HEAD ~ a unique protocol } instead of an Ethernet protocol
OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH