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1794-IA8 AB

◆ 企业名称：厦门莫格电气自动化有限公司

◆ 联系人： 雷琳

◆ 手机：18050035902

◆ Q Q ：1982497648

◆ 电话：0592-6808394

◆ 传真：0592-6514751

诚信经营，质量为首，服务至上，莫格电气 小雷 竭诚为您服务！！！

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附表 国外品牌2003年中国市场销售统计表

摘要：ptn（分组传送网，packet transport network）是指这样一种光传送网络架构和具体技术：在ip业务和底层光传输媒质之间设置了一个层面，它针对分组业务流量的突发性和统计复用传送的要求而设计，以分组业务为核心并支持多业务提供，具有更低的总体使用成本，同时秉承光传输的传统优势，包括高可用性和可靠性、高效的带宽管理机制和流量工程、便捷的oam和网管、可扩展、较高的安全性等。

关键词：ptn ；sdh mstp； 优点 ;原理； 应用

中图分类号：tn915 文献标识码：a

从传送网的发展过程来看大致经历了pdh（准同步数字体系）、sdh（同步数字体系）、wdm(波分复用)、mstp（基于sdh 的多业务传送平台）、ptn（分组传送网）五个发展阶段。

在以往的电信网中，多使用pdh设备。这种体系对传统的点到点通信有较好的适应性。而随着数字通信的迅速发展，点到点的直接传输越来越少，而大部分数字传输都要经过转接，因而pdh系列便不能适合现代电信业务开发的需要，以及现代化电信网管理的需要。sdh就是适应这种新的需要而出现的传输体系。

sdh-容量较大，一般是16e1到4032e1。sdh是一种将复接、线路传输及交换功能融为一体、并由统一网管系统操作的综合信息传送网络，它可实现网络有效管理、实时业务监控、-络维护、不同厂商设备间的互通等多项功能，能大大提高网络资源利用率、降低管理及维护费用、实现灵活可靠和高效的网络运行与维护。

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