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