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