业务的IP化是电信网络发展的一个必然趋势，在承载网络逐步由接口IP化向内核IP化演进的过程中，分组传送网（PTN，PacketTransmissionNetwork）技术应运而生。 本文从业务发展的需求和运营商传送网转型的角度分析分组传送网技术产生的背景，并对PTN的相关技术包括运营商骨干桥技术(PBB/PBT，ProviderBackboneBridge/ProviderBackboneTransport)、运营商VLAN传送(PVT，ProviderVlanTransport)以及多协议标签交换(MPLS，Multi-ProtocolLabelSwitching)等技术的优缺点进行分析和...IP-based business is an inevitable trend of development in telecommunications network. When the bearer network is evolving from the interface-based IP to the core-based IP, the PTN(packet transport network) is born. In this paper, the technical background of PTN from the business needs and view of transformation of the transmission network operator are analyzed,and the advantages and disadvantag...学位：工程硕士院系专业：信息科学与技术学院电子工程系_电子与通信工程学号：X200722203
