【作者】 史国炜；

【导师】 陈明；

【作者基本信息】 西北工业大学 ， 检测技术与自动化装置， 2001， 博士

【摘要】 SDH在向高速骨干网进军的同时，正向速率较低的接入网领域渗透。因此，研究开发适合本地业务情况的SDH光纤接入传输系统是目前SDH技术应用的一个重要方向。此外，在SDH传输平台上直接接入和传输Internet业务（IP overSDH），是SDH目前研究的热点。国外一些设备厂商和研究单位已宣布研制成功了SDH的IP接口设备，其核心技术仍对外封锁。本论文将围绕这两个方向的一些关键技术问题进行分析和研究，具体包括以下一些内容： ◇研究开发出一种高性能的SDH设备时钟（SEC）。提出SEC的核心器件——锁相环（PLL）的优化设计原则，并优化设计出具有极窄带宽的数字式锁相环（DPLL）。由该DPLL构成的SEC能自适应地调节相位捕捉的速度和精度，直接对155MHz的线路定时信号实施跟踪，有效地解决了SDH技术在接入网中应用时存在的网同步问题。该SEC已成功地应用于大唐电信SDH（155Mbps）光纤传输系统中。 ◇提出一种新的减小指针调整抖动的方案——自适应调制泄漏法。该方案采用新的相位扩散机理，对每1比特抖动的泄漏进行序列调制，有效地将相位泄漏频率从低频段移向高频段，使泄漏相位很容易被锁相环滤除，从而达到减小输出抖动的目的。与以往减小指针调整抖动的方案相比，该方案极大地提高了对在SDH/PDH网络边界产生的抖动的抑制能力，确保了SDH技术在接入网中应用的服务质量。 ◇提出SDH接入网的组网方法和保护策略。在研究SDH自愈网络的可靠性、生存性以及网络成本的基础上，首次论证了SDH在接入网中采用U-SHR/2环型拓扑和相应保护方式的优势。同时对SDH接入网的生存性的定量分析，有助于对其防破坏能力作出预测和评估。这些研究对SDH接入网的设计与维护具有指导意义。 ◇研究开发出一种用于接入网的SDH光纤传输系统。重点给出SDH光纤传输系统核心网元——分插复用器（ADM）的设计，以及ADM中一种具有自主产权的交叉连接（DXC）矩阵芯片的设计。对系统的技术指标进行了较为全面的测试，测试结果表明本SDH光纤传输系统具有优良的性能。 摘 要—— 中研究开发出一种m OV盯 SDH宽带接人服务器。在研究基于 SDH的＊业务接入技术O OVer SDH）相关协议的基础上，提出一种P叫erSDH宽带接入系统的设计方案，并进一步提出了系统关键部件一包交换路由引擎的数据转发算法。设计出基于 FpGA的包交换路由引擎，填补了国内空白。 今跟踪研究P OV0 WDM光因特网技术。在对另一种新兴的传输技术一波分复用（WDM）技术进行研究的基础上，探讨 IP over DWDM技术在未来光英特网中的应用。着重对IpOVOfWDM这种正处于探索阶段的因特网解决方案的关键技术进行了跟踪研究。更多还原

【Abstract】 As developing in the high speed trunk networks, Synchronous Digital Hierarchy (SDH) is now entering the low speed access networks. Researching and developing SDH optical transport system, which is suitable for the local service situation and is used in access networks, is an important trend in the application of SDH. In addition, IP over SDH technique is the hot topic in the SDH research field. Some foreign companies and institutes announce that they have succeeded in designing the IP interface equipment, but the core technique is still closed to the public. In this thesis, I will analyze and study the key technical problems meeting in the two research directions. It includes contents as follows: Research and develop a new kind of high quality SEC for SDH system. We provide the optimal principle for designing the Phase Locked Loop (PLL), which is the core component of SEC, and design an optimal Digital PLL (DPLL) with very narrow bandwidth. The SEC containing this kind of DPLL can adjust the phase acquisition speed and precision adaptively. It tracks the timing signal of 155MHz line directly and resolves the network synchronous problem during applying SDH in access networks. The SEC has been used in the SDH optical transport system (155MHz) of Datang Telephone Co. Ltd successfully. Provide a new scenario to reduce the pointer adjustment jitter named adaptively modulated bit leaking. It adopts a novel phase spreading principle and carries out sequence modulation to the leaking of per bit. Therefore, the phase leaking is removed from the low frequency band to the high frequency band effectively, which makes leaked phase to be filtered by the PLL easily. Compared with previous scenarios reducing the pointer adjustment jitter, it greatly improves the ability to suppress the jitter generating in the SDHIPDH network edge and ensures the service quality when SDH technique is used in access networks. Provide the network organizing method and protecting strategy for SDH access networks. On the basis of studying the reliability, survivability and the cost of SDH self- healing networks, we certify the advantages of using U-SHRI2 loop topology and corresponding protection manner in SDH access networks. At the same time, thesurvivabiIity quanitative analysis for SDH access networks is helpful to forecast andevaluae the ability against damage. These researches are significan in designing andmaintaining SDH access netwOrks. Research and develop the SDH optical transport system used in accessnetwOrks. We provide the design of the core network elemellt of SDH opticaltrAnsmission systeWep multiplexor (ADM), as well as the design for the crosscotmection matrix chip with property right in ADM. We comPletely test the tecImicalparameters of the system. The testing results show that our SDH optical transportsystem has excellent performance. Research and develop a kind of IP over SDH wide band access server. On thebasis of studying the corresponding protocols of IP over SDH, we provide a novelscenario for designing IP over SDH wide band access system, and develop the daretransfer algorithrn of the key comPonent of the systemopacket switch router engine.Furthermore, we design the packe switch router engine based on FPGA and it fills thetechnical empty in China. Traking the research abollt IP over WDM optical Intemet tCchnique. On thebasis of studying another novel trAnsport techniqueWaVelength Division Multiplexing(WDM), we discuss the aPPlication of IP over DWDM technique in the optical Intemetof the fuure. We focus on studying and tracking the key techniques and development ofIP over WDM, which is an Intemet resolution scenario更多还原