1、概述化导致传送网络的分组化,分组传送网(PTN)以分组交换为核心,将以太网的灵活性与传送网的高可靠性、安全性有机地结合起来,既支持高效高质量地传送以太网业务,又兼容传统的TDM、ATM等业务,能较好地满足电信运营商实现全业务统一承载和网络融合的需求。 1, the generalization led to the transmission network packetization, Packet Transport Network (PTN) to packet switching at the core of the Ethernet flexibility and transport network of high reliability and security organically combine both to support efficient and high quality Transmit Ethernet services, but also compatible with the traditional TDM, ATM and other services, to better meet the telecom operators to achieve full service uniform bearer and network convergence needs.