A method and an apparatus for implementing {HEAD ~ a storage function} in {TAIL ~ a passive optical network system} 
in
A method and an apparatus for implementing { HEAD ~ a storage function } in { TAIL ~ a passive optical network system }
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL