PTN技术与IP化移动回传网

融合了分组技术及同步数字体系（SDH）技术优势的分组传送网（PTN）技术以分组交换为核心,先天具备高效统计复用能力,更适应分组业务的高效传输。同时其类似SDH的强大运行维护管理（OAM）及电信级保护能力保障了移动回传业务的高效管理及传输质量。基于多协议标签交换传送应用（MPLS-TP）技术的分组传送网在多协议标记交换（MPLS）体系基础上去除了倒数第二跳（PHP）、标签合并及等价多路径（ECMP）等无连接特性,并在OAM、保护及同步技术方面做了相应增强,更适合承载IP化后的移动回传业务及大客户业务。PTN与原有多业务传送平台（MSTP）、城域以太网及IPoverWDM/OTN网络有机配合,合理分工,将共同服务于全IP时代的电信业务。

PTN and IP-Based Mobile Backhaul

Packet Transport Network（PTN） integrates the advantages of packet technology and TDM technology.Taking the packet switch as its core,PTN has a high statistical multiplexing ability,which allows it to become a more efficient packet transfer service.Its strong Operation Administration and Maintenance（OAM）—similar to SDH and carrier-class security protection services—ensure efficient mobile backhaul business management and transmission quality.MPLS Transport Profile-based（MPLS-TP） packet transport network eliminates its connectionless features（such as Penultimate Hop Popping（PHP）,label merge,and Equal-cost multi-path（ECMP））,and is enhanced in terms of OAM,protection,and synchronization.This is ideally suitable for carrying IP-based mobile backhaul services and key account services.PTN,and the original Multi-Service Transport Platform（MSTP）,Metro Ethernet,and the IP over WDM/OTN network of organic complexes,contribute to an ＂all IP＂ era of telecommunications services.