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