{HEAD ~ A bus coupler} for exchanging {TAIL ~ data} between a network constructed for transmitting Ethernet telegrams and a lower level bus system , comprising: 
for exchanging
{ HEAD ~ A bus coupler } for exchanging { TAIL ~ data } between a network constructed for transmitting Ethernet telegrams and a lower level bus system , comprising :
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH