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Next Generation Networking (NGN)
Next Generation Networking, also known as NGN, is a common term used for emerging computer network architectures and technologies. It encompasses data, voice and video. NGNs are based on Internet technologies, including Internet Protocol (IP) and Multiprotocol Label Switching.
It is generally the convergence of infrastructure and services, and integration of service offerings, with IP being the fundamental technology. NGN seamlessly blends the public switched telephone network (PSTN) and the public switched data network (PSDN) creating a single multiservice network
Rather than large, centralised, proprietary switch infrastructures, this next-generation architecture pushes central office functionality to the edge of the network.
The result is a distributed network infrastructure that leverages new, open technologies to reduce the cost of market entry, increase flexibility, and accommodate both circuit-switched voice and packet-switched data.
What is the current scenario?
Today's network is divided into two elements: the PSTN and the PSDN. The PSTN consists of large, centralised, proprietary Class-5 switches with remote switching modules and digital loop carriers.
This architectural configuration has changed little over the last several decades.In contrast, the substantially smaller PSDN-consisting of network points of presence and remote access devices-is growing at a dramatic rate.
The growth of the PSDN is driven by the Internet, intranets, virtual private networks and remote access. However, the PSTN continues to be the principal means of delivering data services. Many industry pundits claim that packet-switched voice will displace circuit-switched voice in a matter of a few years.
What are the benefits of NGN?
NGN allows the continuation of existing network as well as inter-operability with the same network, while in parallel enabling the implementation of new capabilities. Another big advantage of NGN is that it provides mobility.
It gives the user and devices the ability to communicate and access services from different locations and different technical environments. In addition, it gives the ability to communicate using a variety of terminal equipment, with or without service continuity, while in transit or while changing access means.
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