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