NGN (NEXT GENERATION Network)
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NGN (NEXT GENERATION Network)
What is NGN?
NEXT GENERATION NETWORK is a communication line network based on an IP that can be replaced with a conventional public exchange telephone network.The aim is to create a Ubikitas network society by building a QOS and security IP networks as the next -generation communication infrastructure, so that various services can be developed.Standardization is being promoted around the world, and the NTT Group is promoting in Japan.
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Detailed explanation
NGN is a next -generation network that can be replaced with a conventional public exchange telephone network.In particular, it refers to a communication line network based on IP.The aim is to create a Ubikitas network society by building a QOS and security IP networks as the next -generation communication infrastructure, so that various services can be developed.
By shifting the public exchange telephone network to NGN, the maintenance cost of the conventional telephone network can be reduced, and at the same time providing various services unique to IP line networks, a new source of income can be secured.For this reason, NGN is being promoted mainly by telecommunications carriers.The ITU-T (International Telecommunications Federation / Electric Communications Standardization Division) classifies the following six types of services provided by NGN.
NGN is currently under standardization in the ETSI (European Telecommunications Association) "Telecommunications and Internet Services and Protocols for Advanced Networking" project.ITU-TS (Internet Engineering Task Force) and IETF (Internet Engineering Task Force) have launched the “FOCUS Group Next Network) in a joint project in May 2005.
| NTTグループが提唱するNGNの利用イメージでは、3階層のルーターネットワークとSIPサーバーで構成され、SIPサーバーとルーターが通話ごとに帯域を割り当てる方式を採用している。現在、FMCとFTTHを組み合わせてインフラを構築するとして、すでにフィールドテストが実施されている。 |
The NTT Group's proposed NGN also builds an IP network that has improved security and security as the next generation communication infrastructure.In the images of the use, it consists of three -level router network and SIP server, such as "SNI" (application server network interface), "UNI" (user network interface), and "NNI" (interstant interplan interface), and the SIP server and router.A method of assigning a bandwidth for each call is adopted.
Of these, UNI is the user interface, and when receiving multicast communication from IP broadcast server or unicast communication from VOD server, communication is performed via SNI, and other ISP users and audio calls are used.When performing a video phone, communicate through NNI.The Internet use is also accessed by tunning the ISP and NGN connected by NNI, and communication is performed by PPPoE.In the case of Internet use, QOS is not provided, and it is a best -effort communication.
Currently, a field test is already being conducted to build infrastructure by combining FMC and FTTH.When a field trial, the three -level network is opened, which aims to provide bandwidth control, users and line authentication technology, and security functions.
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