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