{HEAD ~ The gateway} can communicate with {TAIL ~ the RFID reader} using active RF communications, power line communications protocol, or hardwire connection 
communicate with
{ HEAD ~ The gateway } can communicate with { TAIL ~ the RFID reader } using active RF communications , power line communications protocol , or hardwire connection
HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH