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