NGN is different from PSTN or TDM network in that all information
is transmitted by packets. The best thing of NGN is a single network offering many services.
NGN is designed to separate transport network from the services layer. By separating transport and service layers, a telco can offer new services by defining it directly at the service layer without considering the transport layer. The major components of NGN are transport (core network, access network), service control, service and application layers.
1. Transport: Core Network layer: The core network is a single converged fixed network, which can carry voice and data. The network technology is multi-protocol label switching (MPLS) with all traffic transported as IP.
2. Transport: Access Network layer: The Access Network supports wire and wireless access. It is service independent and can support multi-services.
3. Service Control layer: Service control layer will provide a means for teleco to bring new service to market quickly.
4. Service and Application layer: The service and application layer provide service independent from transport (core and access network) such as VOIP, IPTV, high speed Internet access.
Source: European Telecommunications Platform (ETP)
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