Confidential and Proprietary Information of ZTE CORPORATION 15
C h a p t e r
1
Overview
In this chapter, you will learn about:
The development of NGN products.
IP networks will become infrastructure for the next generation network
(NGN) due to rapid development. The NGN system features following
remarkable distinctions than PSTN:
The PSTN networking and services are not transparent. The PSTN
services are transported in segments over physical networks. The
PSTN is constructed in a leveled networking mode in terms of services
and structure. Since the Internet is virtual, any two points within the
Internet can have peer-to-peer communications. As a result, the
service deployment and physical construction on the IP network are
transparent. The NGN is a kind of application on the IP network, so it is
a virtual stepless network.
The PSTN switch is comprehensive and integrates access, control,
transmission and other functions; the switch thus is complicated and
high in cost. The NGN network equipment separates access, control
and transmission functions.
Firstly, the transmission in the NGN is carried by IP base networks.
Secondly, since the complexity of communication technologies between
devices and networking is reduced in the IP network, separation of
subscriber access from control becomes possible.
Control functions independent of access equipment enables one single
control point controlling a larger network than a PSTN CO office. This
facilitates service provisioning and central management. In the NGN,
control functions are implemented by Soft Switch (SS).
The PSTN implements subscriber access at central offices (CO) . The
CO features the following advantages:
Forming a large scale operation with a certain convergence ratio
between switching resources and subscribers.
Minimizing PSTN layers.
Simplifying management in a centralized way and providing quality
services for subscribers in a central and uniform way (within one same
exchange).
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