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