{HEAD ~ The network} employs {TAIL ~ a Ring Wiring Center} which includes a single optical fiber attached to a processor 
employs
{ HEAD ~ The network } employs { TAIL ~ a Ring Wiring Center } which includes a single optical fiber attached to a processor
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH