Each user process is operative to retrieve a requested title from two or more of {HEAD ~ the processors} via {TAIL ~ the backbone switch} and to assemble a requested title for delivery to a requesting subscriber location 
via
Each user process is operative to retrieve a requested title from two or more of { HEAD ~ the processors } via { TAIL ~ the backbone switch } and to assemble a requested title for delivery to a requesting subscriber location
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH