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