多厂商环境下SDH网络管理系统的数据库访问模式

对多厂商设备组成的SDH传输网子网管理系统(SNMS)使用的数据库结构进行研究。阐述了不依赖于单个数据库系统和技术的模式。并且实现子网域管理中对象的虚拟定址。     

多厂商环境下SDH网络管理系统的数据库访问模式

对多厂商设备组成的 SDH传输网子网管理系统 ( SNMS)使用的数据库结构进行研究。阐述了不依赖于单个数据库系统和技术的模式。并且实现子网域管理中对象的虚拟定址     

德国赛克Tamino XML Database

这是一款XML标准数据库管理系统,数据库的管理对象,主要是Internet上的对象。在许多地方使用了标准的规模,可以通过HTTP来直接存取数据库,还支持了OLE DB、DCOM、ODBC、以及JDBC。     

NetWareV4目录服务数据库的管理

ＮｅｔＷａｒｅＶ４目录服务数据库的管理倪群管理ＮｅｔＷａｒｅＶ４目录服务数据库包括创建、管理对象和它们的环境（Ｃｏｎｔｅｘｔ），本文讨论管理ＮＤＳ数据库的主要任务。一、ＡＤＭＩＮ用户对象当网络超级用户首次入网时，它使用的身份为ＡＤＭＩＮ，ＡＤＭＩＮ是...     

SDH网管系统简单路由查询算法的设计与实现

提出了一次性查找出所有简单路由的算法．为查询子网管理系统(SNMS)管理域中任意两个插／分处处用器(ADM)网元之间所有路由上的空闲时隙,此路由算法一次性计算出从起点网元(NE)到终点NE的所有可用路由,经实践验证,存储量需求和计算时间较好．     

浅谈信息技术在电力调度管理中的应用

调度部门里面,生产和安全是信息管理的主体,办公自动化和班组管理作为客体辅助,信息管理框架为调度部门使用人、财、物,全面创建调度部门里面被管理对象和管理对象虚拟信息空间,为此调度中的管理、经营提供着畅通有效的现代化信息渠道.本文就是分析信息技术在电力调度管理中的使用状况.     

SDH传输网数据采集网络管理系统研究与实现

讨论了SDH网络管理的基本内容,并以华为公司的子网管理系统T2000为例,在Java平台上实现了基于SNMS的SDH数据采集网络管理系统,克服了目前SNMS存在的一些缺陷,能够实现告警信息、配置信息等的集中监视、屏蔽等操作,对更好的建设互操作的综合网络管理系统具有一定的指导意义。     

NetGuard-WDM在中国电信的应用

NetGuard－WDM传输网络集中监控系统是国信朗讯科技网络技术有限公司网管软件系列中的一种,是建立在各传输设备的网元管理系统(EMS)或子网管理系统(SNMS)上的网络层管理系统(NMS),能够在统一的平台上实现对多厂商、多制式传输设备的集中监控和性能分析,从网络层和面向维护的角度对众多厂商的传输设备进行统一的管理,提高网络的运行质量和效率。NetGuard－WDM目前已经在中国电信省际干线和广东电信省内干线得到应用。本文介绍NetGuard－WDM在中国电信省际干线的应用。网络管理系统功能NetGuard－WDM的管理对象为中国电信骨干DWDM传输网。管理范围包括朗讯、阿尔卡特、NEC等厂家的DWDM网元管理系统,将来还要管理网上其他厂商的DWDM网元管理系统。NetGuard－WDM分两级：集团网管中心级和省公司级。通过NetGuard－WDM集团网管中心可以做到：全国DWDM一级干线的故障管理、网络资源的配置管理和拓扑图管理、分配省公司的管理范围和权限;通过NetGuard－WDM省公司可以做到：本省范围内的DWDM一级干线的故障管理、网络资源的配置管理和拓扑图管理。NetGuard－WDM主要实现...     

应用于TMN的一种数据库框架

介绍了一种在TMN基本组件中使用数据库的框架。管理者和代理以客户/服务器方式动作,用数据库来存放TMN负责的被管目标的实例。数据库也用来存放能够反映这些被管目标状态变化的事件。各被管目标及相互间关系用GDMO和ASN.1来描述。 关键是这种框架不依赖于任何具体的数据库技术或系统,但能够满足TMN及其开发过程的需要。这是通过一个独立于数据库的客户/服务器应用程序接口(API)来实现的,对于该API每个数据库都有一个服务器实现,我们称为数据库包。另外,数据库包还有一个Schema产生器(Schema是这样定义的,它是一组以数据定义语言来表达的语句集,该语句集完整地描述了数据库的结构),用来将MIB信息组装到数据库中。 数据库还可以用来作为虚拟内存地址空间,以便寻址和操作大量的被管目标,而不用把它们同时调入内存。为了实现这个功能,引入了虚拟被管目标地址(VMOA)。它是一个描述被管目标在数据库中参考的类,这种方式允许所有、部分或零个被管目标属性存放于数据库中。例如,所有的属性可能在实际网络资源中维护,但数据库中只需要维护该被管目标与其它被管目标之间的关系。     

EPON的扩展OAM在广电双向网络的实现与应用

近几年随着中国FTTX的步伐不断迈进,中国电信(CTC)对EPON的标准定义也在日趋完善,在CTC2.1后引入了很多的管理对象如LLID、VOIP等。而对于每种管理对象的操作细节都开放了空间,因而每个EPON生产厂商都可以根据市场需求使用自己定义的标准来实现便捷管理。主要讨论EPON的OAM协议原理与设计实现中,标准OAM及扩展OAM对EPON产品的便捷管理及针对广电双向网络的独特设计需求应用。     

Carriage of SDH over satellite systems

This paper examines the potential of satellite systems to carry synchronous digital hierarchy (SDH) transmissions and proposes a possible earth-station architecture capitalizing on the benefits that SDH equipment offers. It is shown that a range of SDH multiplexing rates are viable over satellite and that multi-destination operation of satellite systems is facilitated by using the inherent features of the SDH. The use of STM-1 (155 Mbit/s) and sub-STM-1 transmission rates as transmission sections along with appropriate integration of the multiplexing and modem equipment would:. (a) enable SDH path continuity between earth-stations, allowing the satellite network to be integrated with managed terrestrial networks to form global managed transmission platforms. (b) provide bandwidth and equipment savings at earth-stations. Several technical issues relating to SDH operation over satellite systems are considered and SDH pointer corruption is examined in some detail.     

CMIS/P++: extensions to CMIS/P for increased expressiveness andefficiency in the manipulation of management information

CMIS/P is the OSI systems management service and protocol used as the base technology for the telecommunications management network. It is a generic object oriented protocol that provides multiple object access capabilities to managed object clusters administered by agent applications. Its navigation and object selection capabilities rely on traversing containment relationships. This is restrictive because information models for emerging broadband technologies (SDH/SONET, ATM) exhibit various other relationships. We present extensions to the CMIS service that provide a richer access language and show how these extensions can be supported by corresponding extensions to the CMIP protocol. These extensions allow traversal of any object relationship and filtering out objects at any stage of the selection process. CMIS++ provides much greater expressive power than CMIS, while CMIP++ supports the remote evaluation of the corresponding expressions, minimizing the management traffic required for complex management information retrieval. These extensions follow an incremental approach, starting from a version compatible with the current standard and gradually adding sophisticated features. The applicability and importance of the proposed concepts is demonstrated through an example from SDH management, while we also discuss implementation considerations     

An open network management architecture: OSI/NM Forum architectureand concepts

Several organizations are incorporating the architecture being developed by the Open Systems Interconnection/Network Management Forum into their network management products and systems. It is expected that, as this architecture develops, it will be the basis for multivendor exchange of network management data for the next five to ten years. This architecture and key concepts being developed by the Forum to allow the interoperation of several network management systems using an open interface are summarized. These apply to the full range of networks that must be managed, including computer and communication, local area, wide area international, voice (public and private), and packet data networks. The concepts covered include: Conformant Management Entity (CME), which is a management system that supports the interoperable interface defined by the Forum; managed objects, the abstract representations of the real resources to be managed; and the interoperable interface, which consists of a defined set of protocols (using the OSI seven-layer protocol stack) over which particular messages about managed objects are exchanged     

基于Packet over SDH的以太网业务接入的设计实现

POS（Packet over SDH)是一项新兴的技术，它能够在传统的SDH传输平台上提供灵活和高效的数据业务支持，从而实现网络功能的增值。目前，POS作为IP宽带传送技术得到了广泛应用，特别是在城域网建设中受到人们的青睐。在现有的SDH设备中开发POS接口能极大地提高产品的竞争力，推动网络建设的发展。本文提出了一种在SDH设备中实现以太接入的整体解决方案，并介绍了基于FPGA设计的POS方案的设计思想和结构。该方案实现效率高，充分考虑了传输的可靠性，并且易于扩展。     

锁相环在SDH网络中的应用

在同步数字网络中,同步是数据流正确传输的基础,因此同步技术是数字传输领域的关键技术。为了实现网络的同步,业界普遍采用锁相技术,因为锁相环的性能优越,尤其是数字锁相环的可调范围更宽而且更容易实现。文中以SDH(同步数字系列)技术为例,介绍了以锁相环为基础的同步技术的原理和特点,根据SDH网络中的同步结构和方式,提供了锁相环在SDH网络同步中的具体应用方案,着重分析了这种结构的特性。这种方案在实际应用中有较好的稳定性,对各种网络的同步是一种很好的参考。     

传输告警分时段屏蔽功能实现与应用

为了屏蔽本地传输网中由数据专线用户周期性对接入传输设备（特别是SDH设备）关电引起的大量告警,我们提出在传输网管加入告警＂分时＂＂屏蔽＂功能,主要是对于告警＂屏蔽＂功能增加＂时间＂维度,同时细化网管告警＂屏蔽＂对象的颗粒度。     

Access network management modeling

The effective management of access networks presents challenges which are not found in other sectors of the telecommunications network. The approaches being developed for the management modeling of access networks allow systems with different technologies and from different vendors to be managed in a uniform way. The functional architecture used for SDH can be generalized so that it is applicable to access networks, and this forms the basis of the modeling of their logical functionality. Technology-specific models of the various elements can be integrated into a technology-independent network model, and the physical resources and logical structure can be modeled to simplify repairs and improve inventory management. The development of standards for the management of the access network is an evolutionary process, but sufficient standards are now in place in order to achieve a useful level of functionality over a Q3 interface. Developing solutions that take advantage of the initial telecommunications management network (TMN) standards allows experiences to be fed back into the standards bodies to generate a more complete set of standard specifications, leading to the goal of access network management as part of a totally integrated TMN     

Error monitoring for optical metropolitan network services

Service providers rely on performance monitoring capabilities not only to ensure integrity of their network but also to support service-level agreements with their customers. The depth of monitoring is directly tied to the technology and protocol used in the transport layer of the network. Next-generation services based on enterprise-centric, non-SONET/SDH protocols, such as Gigabit Ethernet and Fibre Channel, as well as managed protocol-independent wavelength transport, have created a number of challenges for service providers because of the differences in how error monitoring is performed. In this article we describe and compare protocol-dependent and protocol-independent error monitoring techniques that apply to these service offerings     

SDH以太共享环在城域网的应用

随着因特网和数据业务的爆炸性增长，城域网的主要业务正在从话音向数据转移。然而过去的城域传送网是为话音业务设计的，所以采用的是TDMM网络(SDH、SONET)。本首先介绍了基于SDH网络传送数据业务的几种新技术，如：POS、GFP、LCAS、RPR、共享以太环等，以及可以实现业务隔离、保证安全的VLAN、VLAN嵌套技术，然后对各种城域网数据传输技术进行了比较，最后分新了薪一代的MSTP设各府该具有的几个特点。     

Evolution of the Italian Telecommunication Network towards SDH

The digitalization of both transmission and switching facilities as the basis for both a high standard quality of service and the introduction of advanced network features (like intelligent network and integrated services digital network, or ISDN) is described. The development of synchronous digital hierarchy (SDH) systems is discussed, with particular attention given to the add-drop multiplexer and to management issues. The impact of the new SDH transmission equipment on the present plesiochronous network is assessed. The currently envisaged strategy for introducing SDH systems into the Italian transmission network is examined. Deploying SDH systems within large metropolitan areas, both at loop plant and urban junction levels, is discussed