中兴传输产品技术问答

1 46 2001年第 2期 < 中兴通讯技术 > 中兴 ZXSM- 10G 传输设备的综合业务支持能力如何 ? 答传统 SDH设备只提供了将各种 PDH等级信号或其他信号复用映射进 STM- N帧结构的途径 , 使设备的应用缺乏灵活性 . 中兴 ZXSM- 10G系统支持 AU级的级联应用 , 级联应用方式适合传送非 PDH标准等级的信号 , 使中兴 ZXSM- 10G系统能适应更广泛的业务速率范围 , 满足 IP、 ATM等数据 /图像业务传送及引入新业务的需求 . ZXSM- 10G系统采用 IP over SDH/Ethernet over SDH技术 , 可提供 10Mbit/s/100Mbit/s Ethernet、 GE接口 , 并支持级联应用 , 适合 IP、 ATM等数据业务的接入和传送 . 设备利用了 SOH中的开销字节 , 还可提供额外的数据接口 , 有公务电话、 RS- 232/422、 F1同向数据接口 10Mbit/s/100Mbit/s以太网接口 , 并可提供灵活的开销通路上下方式 .     

基于机动光传输网的智能管理系统设计

根据机动光传输网的特殊性及网络运行、维护和管理面临的问题,研制了2 Mbit/s智能管理链路.整体设计采用模块化结构、功能集成和计算机网络控制的方法,解决了从2 Mbit/s复帧结构中提取和插入信令时隙、数字话音通路无阻塞交换、2 Mbit/s链路实时在线监测、网络远程监控的难题,实现交叉连接、光传输设备的性能监视、线路自动调度与维护功能.在机动光传输网中采用两种方式开通应用,网络运行正常.     

扩大中继问隔的SDH光传输系统

本文主要介绍新的SDH光传输系统。该系统扩大了中继问隔，传输线路更经济；采用SDH网控制系统，增强了运用性能。新的SDH光传输系统，采用了长间隔模块A。它是把52Mbit／s或156Mbit／s的低速信号复用成622Mbit／s高速信号的SDH光传输系统，是使用光奸放大器，实现160km中继间隔的SDH光传输系统。应用软件从面向目标设计的52Mbit／s／156Mbit／s交叉连接设备(模块AX)移用过来，这样做既可以提高开发效率，同时又易于扩充功能。     

大唐电信MSTP设备的高速连接解决方案成都大唐光通信公司

一.大唐电信TranSmartTMSCT10000 MSTP系统简介 大唐电信针对新的网络特点专门设计的TranSmartTM SCT10000 MSTP光传 输设备,是集155Mbit/s、622Mbit/s、2.5Gbit/s、10Gbit/s的全兼容、一体化光传输系统,可以实现从STM-1至STM-64的平滑升级.单子架容量:10G系统接入容量80G.2.5G系统接入容量40G.     

2Mbit/s高速信令链路架构移动通信七号信令网

2Mbit/s高速信令链路是在传统的64kbit/s七号信令链路上发展起来的一种新技术,是现有七号信令技术的延伸.文中通过对2Mbit/s高速信令链路原理、特点的介绍,阐明了该技术在现阶段使用的实际意义,并给出了用2Mbit/s高速信令链路架构移动通信七号信令网的总体方案.     

无线接入网络IP化的现状和未来

随着无线技术的发展,空口的传送速率在飞速增长,下行速率从R99的384kbit/s发展到LTE的100Mbit/s,基于2Mbit/s的传输带宽已无法满足未来无线数据业务的大带宽需求.因此,无论是2G还是3G网络,都在朝着更符合未来无线业务需求的全IP架构方向演进,而LTE网络从标准设计的初期就采用了全IP的架构.     

适用于骨干网的新型光纤研究

目前400Gbit/s光传输系统受到传输距离的限制,超低损耗光纤和大有效面积光纤等新型光纤有望助力400Gbit/s光传输系统大规模部署.首先介绍光纤网络的概况,然后分析100Gt/s和400Gbit/s系统在新型光纤传输的实验和现网测试结果,并提出光传送网基础设施的演进建议.     

信息通信英语新缩略语

HCI(Human鄄ComputerInteraction，人—机对话)HDLC（High鄄levelDataLinkControl，高级数据链路控制）ISO颁布的一种基于比特流的数据链路层通信规程。链路控制通过一定比特组合表示的命令和响应实现，可与信息文件一起传送，而且信息文件可以是任意的比特串组合，传输效率、可靠性及灵活性很高。HDSL（High鄄bit鄄rateDigitalSubscriberLine，高速数字用户线）一种铜线接入技术，具有在一对普通用户线上双向传输1.168Mbit/s的信息，或两对用户线上传输2.048Mbit/s信息的能力。但目前还不能传输2.048Mbit/s以上的信息，传输距…     

S560海底光通信系统

自从采用光传输以来,光传输技术发展的步伐大大加快。工作在280Mbit/s比特率、1.3μm长波长的第一条海底干线光通信系统敷设完毕仅3年,一种工作在565Mbit/s比特率,1.55μm光窗口、使用单模激光器和雪崩二极管的新系统即将敷设。     

2Mbit/s高速信令链路架构移动通信No.7信令网

2Mbit/s高速信令链路是在传统的64kbit/sNo.7信令链基础上发展起来的一种新技术,是具有No.7信令技术的延伸,本文通过对2Mbit/s高速信令链路原理,特点的介绍,阐明了该技术在现阶段使用的实际意义,并给出了用2Mbit/s高速信令链路架构移动通信No.7信令网的总体方案。     

基于GPS和短信技术的迷路报警器

文章阐述了一种迷路报警手持终端系统的硬件设计。该系统基于GPS全球定位技术和GSM通信技术,采用MSP430F149作为处理核心,将GPS模块采集的经纬度信息储存并通过GSM模块以短信的形式发送到后台监控系统。该手持终端专为盲人设计,采用一键报警方式,后台监控系统定位,与传统的GPS导航手机相比,更加人性化。     

光传送网的故障管理

用分层方法讨论了光传送网络的告警管理功能,着重分析了全光网络中缺陷指示信号的起源、传输与终结问题,此外还对光监控信道的故障情况的处理方法进行了讨论。     

Supervisory signal transmission by modulating the mB1C codecomplementary bit

A supervisory signal transmission method for digital optical communication systems is proposed. It minimizes circuit scale, clock frequency increase, and interference between traffic and supervisory information, and does not require customization. The supervisory signal is carried by the amplitude-modulated complementary bit in the mB1C coded sequence. The code adds a single bit after every m bit block as a complement to the last bit of the block. Clock frequency increase is kept at a level of (m+1)/m. This additional bit is called the C bit. If the C bit's amplitude is modulated according to the supervisory (SV) signal and the main data block is not modulated, traffic and supervisory information can be isolated in time over the same fiber transmission     

A Network-Based Dynamic Channel Assignment Scheme for TDMA Cellular Systems

Network-based dynamic channel assignment (DCA) schemes can be used to increase the capacity of TDMA cellular systems. In this paper, a new distributed network-based DCA scheme, known as DCA with interference information, DCA-WI, is proposed and its performance is studied. In this scheme, a base station (BS) assigns a channel in such a way as to minimize the effect on the availability of channels for use in its interfering cells. To accomplish this, each BS maintains an interference information table which contains information about the local cell and its interfering cells. DCA-WI does not require system-wide information. Channel reassignment for new and completed calls are used to further reduce the call blocking probability. Simulation results show that DCA-WI provides a lower call blocking probability compared to other existing schemes in both uniform and nonuniform traffic distributions.     

Dependable Traffic Control Strategies for Urban and Freeway Networks

Traffic congestion is a growing problem in many countries around the world. It has been recognized that instead of constructing more roads and freeways to counter this problem it is prudent to improve the utilization of existing road network through a judicious combination of advances in control engineering, communication and information technology. The traffic control architecture proposed in this paper is a combination of communicating Urban Traffic Control Architecture (UTCA) and Freeway Traffic Control Architecture (FTCA). The UTCA combines context-awareness, Cyber-Physical Systems (CPS) principles, and Autonomic Computing System (ACS) principles to optimize traffic congestion and enforce safety in urban traffic network. The UTCA includes a network of adaptive intersection traffic controllers and their immediate supervisory systems, who are also networked. The central piece of each traffic controller is an arbiter, which is a mini CPS. It is aware of the traffic dynamics at the intersection managed by it, by virtue of continuous input from monitoring sensors. Due to this context-awareness ability and its communication ability to exchange traffic information with its neighbors, it can execute policy-based reactions in order to enable safe and efficient traffic throughput at its intersection. Each urban traffic supervisory system is designed with ACS principles in order to minimize downtime caused by environmental emergencies and maximize security of the subsystem under it. A supervisory subsystem will also collect global traffic flow information and contextual constraints from its neighbors. Based on this input it will modify policies and communicate them to its traffic controller for timely adaptation. The urban traffic flowing into freeway traffic will be mediated by Intelligent Ramp Meters (IRM). An IRM interacts with the urban traffic control system and its nearest Intelligent Roadside Unit (IRSU) to regulate the flow of traffic from urban to freeway network. The FTCA consists of a network of mutually interacting IRSUs which monitor traffic flow, communicate with IRMs for providing traffic guidance for freeway drivers. An IRSU will communicate with the vehicles in the zone managed by it in order to provide information on rerouting when road and weather conditions warrant it. It also facilitates exchange of information between vehicles, guide them in lane changes and maintaining safe distance in order to avoid collision.     

新型副载波调制EDFA远程在线监控技术的原理论证

从理论和实验上论证了一种用于掺铒光纤放大器 (EDFA)远程在线监控和判断级连EDFA系统级间断点位置的技术方案。该方案利用频移键控 频分复用 (FSK FDM)技术进行声频副载波调制 ,通过光强度调制实现远程在线EDFA监控信息随主信号的传输。实验测得在副载波调制度为 3 %和 15 %时 ,10Gbit s波分复用 (WDM)光传输系统的功率代价分别为 0 16dB和 0 86dB。采用锁相技术 ,成功进行了 3 %调制度的监控信息解调。说明该方案可以实现对 5级EDFA系统的监控     

Human supervision and control in engineering and music: similarities, dissimilarities, and their implications

The human supervisory control model has been used successfully for decades and in numerous contexts to describe human interaction with complex technical systems. Recently, it has been argued that supervisory control modeling can also be applied in a musical context, to describe the interaction between a conductor and an orchestra. This paper reviews a range of applications of supervisory control modeling. Further, the authors attempt to identify similarities and dissimilarities between its use in technical and musical settings. The aim is to identify valuable knowledge and experience from the musical field. Such experience could be used to enrich the design of interaction between humans and complex technical systems. The key to successful knowledge transfer is the general applicability of human supervisory control modeling.     

电力系统分层分布式监控通讯模式的研究

电力监控系统是将现代的计算机技术、通讯技术和现代控制思想综合运用到发电厂的生产环节，是发电厂或变电站运行和管理的综合自动化系统。其中通讯技术是负责信息交换的软硬件技术的总称，通讯的网络拓扑结构决定了信息交换的可靠性和稳定性。现就通讯技术中的网络拓扑结构展开分析，提出了分层分布式监控系统的通讯模式，并将该模式在工程实践中加以应用，取得了满意的效果。     

Expert-based maintenance: a study of its effectiveness

Monitoring of computer-based systems by a supervisory computer is common for high-availability systems. Expert-based supervisory systems are being proposed which are able to use dynamic information of the system to operate them with increased reliability. This paper brings out the functional capabilities of expert-based maintenance, and presents an analytic model to evaluate the effectiveness of the expert system in maintenance. The abilities of the expert system to maintain the host are parameterized and their effects on the performance of the system are studied. The results show possible improvement in the performance of a host due to expert-based maintenance     

A Double-Deck Elevator Group Supervisory Control System Using Genetic Network Programming

Elevator group supervisory control systems (EGSCSs) are designed so that the movement of several elevators in a building is controlled efficiently. The efficient control of EGSCSs using conventional control methods is very difficult due to its complexity, so it is becoming popular to introduce artificial intelligence (AI) technologies into EGSCSs in recent years. As a new approach, a graph-based evolutionary method named genetic network programming (GNP) has been applied to the EGSCSs, and its effectiveness is clarified. The GNP can introduce various a priori knowledge of the EGSCSs in its node functions easily, and can execute an efficient rule-based group supervisory control that is optimized in an evolutionary way. Meanwhile, double-deck elevator systems (DDESs) where two cages are connected in a shaft have been developed for the rising demand of more efficient transport of passengers in high-rise buildings. The DDESs have specific features due to the connection of cages and the need for comfortable riding; so its group supervisory control becomes more complex and requires more efficient group control systems than the conventional single-deck elevator systems (SDESs). In this paper, a new group supervisory control system for DDESs using GNP is proposed, and its optimization and performance evaluation are done through simulations. First, optimization of the GNP for DDSEs is executed. Second, the performance of the proposed method is evaluated by comparison with conventional methods, and the obtained control rules in GNP are studied. Finally, the reduction of space requirements compared with SDESs is confirmed.