【精品】中国电信下一代承载网络.ppt

Background Challenges Total voice traffic and revenue decreases by the end of 2005. The mobile phone and IP phone calls have cannibalized part of the voice traffic businesses Traditional communication network is unable to support China Telecom’s strategy to become a Integrated Information Service Provider. This is due to its lack of capability in offering value-added service. High OPEX (Operating Expenses) is required for traditional hetergeneous/multiple networks Existing ChinaNet is not a profit generating business Opportunities Acceleration of the Information and Communications Technology (ICT) adoption in government and enterprises would drives the demand for telecom services Adoption of the SIP-based soft-switch technology The impending releases of 3G license Rapid development of the broadband service solutions Migration of voice service from PSTN to soft-switch-based VoIP technology Preparation for 3G-based mobile services Accelerate the development and application of the broadband services base on xDSL access technology Drive managed service and system integration service Built an Integated IP/MPLS-based multi-service platform — CN2 Philosophy of Building CN2 CN2 strength network topology Scalable routing architecture Highest level of redundancy Highest level of security Different class service All services have edge functionality End to end control and managment Simple Network Topology CN2 comprises of two functional planes and four structural layers to offer a seamless connectivity for customers. CN2网络包括2个网络功能层面和4个网络结构层次，实现承载和业务提供相对独立 The two functional planes are high speed data forwarding plane and service provisioning plane 2个功能层面分别是高速转发层和业务提供层 The four structural layers are core layer, aggregation layer, edge layer and services connecting layer 4个结构层次指核心层、汇聚层、边缘层和业务接入层 The high speed data forwarding plane and service offering plane is supported by 4 and 1 vendors respectively. This is to ensure minimum service disruption and better edge servi