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