Network operation center (NOC). NOCS are responsible for monitoring the network for ALARMS like as power fail, Service affected alarm (site down,LAPD OML fault, TRX close HPA alarm etc)& communicate its FIELD engineer to solved the problem. if need any support for software base they provide to recover the problem.

A Network MANAGEMENT System (NMS) is a combination of hardware and software used to MONITOR and administer a network. Communicate with NOC recover the Alarm. 

NMS-->NOC-->Field Engineers=Solved the problem.

Network operation center (NOC). NOCs are responsible for monitoring the network for alarms like as power fail, Service affected alarm (site down,LAPD OML fault, TRX close HPA alarm etc)& communicate its field engineer to solved the problem. if need any support for software base they provide to recover the problem.

A Network Management System (NMS) is a combination of hardware and software used to monitor and administer a network. Communicate with NOC recover the Alarm. 

NMS-->NOC-->Field Engineers=Solved the problem.