The system includes {HEAD ~ a layer specific operation support subsystem} configured to manage {TAIL ~ network elements} that form a sub network over an optical transport network 
configured to manage
The system includes { HEAD ~ a layer specific operation support subsystem } configured to manage { TAIL ~ network elements } that form a sub network over an optical transport network
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH