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ROADMAP-TO-NGN-1
Roadmap to NGN Documents Issue 2, August 2008
Overview of NGN
2–2
video, and multimedia, while maintaining the high reliability, security, ubiquity, and
controlled Quality of Service (QoS) offered by today’s voice infrastructure. The
NGN is intended to be able to support users with a wide range of Customer
Premises Equipment (CPE), from the telephony phones in the PSTN to Internet
appliances including PCs and Personal Digital Assistants (PDAs), using a variety of
wireline and wireless access technologies. NGN is intended to provide an
infrastructure to rapidly offer new innovative applications and services and offer
service providers the option of time or usage-sensitive billing.
The convergence of voice and data on the same network, coupled with the flexible,
open architecture of these networks, creates a platform for the development of
advanced features and services. Therefore, a Next Generation Network is define as
follows:
A Next Generation Network is a packet-based multi-service network
supporting voice service, data applications, and advanced features.
An important component of NGN is Voice Over Packet (VoP). VoP transports voice
calls on packet-based data networks. The NGN/VoP presents carriers with an
opportunity to migrate all information transport, i.e., voice, data, fax, image, and
video, onto a single medium. This would likely create significant cost reductions on
transport, switching, on-site cabling and equipment, and administration and
management, with the single network for both voice and data communications.
2.1.1 Next Generation Network Framework Architecture
Figure 2-1 illustrates the functional elements in a typical NGN framework
architecture. The key functional elements shown in the figure are defined below.
The architecture relies on a Core Network and an Access Network for providing the
necessary connectivity and transport. The Core Network is the packet transport
network (typically based on IP-networking) that provides connectivity to the
functional elements in the NGN. The Access Network represents the local loop
network of the NGN. There are various ways of offering access to the NGN. The
Access Network could be based on the existing copper plant of LECs or could use
other technical options such as Hybrid Fiber-Coax (HFC), Digital Subscriber Loop
(DSL), wireless access, etc.
However, the descriptions of the Functional Elements (FEs) and the interfaces do
not imply any specific physical implementation. Various suppliers have developed
products with functional elements with a single node that communicate with the
relevant elements in other nodes. This framework does not endorse any particular
physical architecture.