a control unit that is designed to convert {HEAD ~ an Ethernet telegram} received via {TAIL ~ the first interface} into an internal data telegram and to output the internal data telegram via the second interface 
a control unit that is designed to convert { HEAD ~ an Ethernet telegram } received via { TAIL ~ the first interface } into an internal data telegram and to output the internal data telegram via the second interface
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH