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Subsystems and network elements in GSM

Network Management Subsystem (NMS)

The Network Management Subsystem (NMS) is the third subsystem of the GSM network in addition to the Network Switching Subsystem (NSS) and Base Station Subsystem (BSS), which we have already discussed. The purpose of the NMS is to monitor various functions and elements of the network. In the Nokia implementation, these tasks are carried out by the NMS/2000, which consists of a number of workstations, servers, and a router, which connects to a Data Communications Network (DCN).

Figurę 8. The NMS and the GSM network

The operator w'orkstations are connected to the database and communication servers via a Local Area Network (LAN). The database serwer Stores the management information about the network. The Communications server takes care of the data Communications between the NMS and the eąuipment in the GSM network known as “network elements”. These Communications are carried over a Data Communications Network (DCN), which connects to the NMS via a router. The DCN is normally implemented using an X.25 Packet Switching Network.

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