The single waveguide can be connected, tail in mouth, to provide a low loss ring concentrator to which receiving and {HEAD ~ transmitting nodes} are coupled via {TAIL ~ associated node switches} 
are coupled via
The single waveguide can be connected , tail in mouth , to provide a low loss ring concentrator to which receiving and { HEAD ~ transmitting nodes } are coupled via { TAIL ~ associated node switches }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL