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