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