多协议标记交换的体系结构

MPLS是宽带网络技术的重要组成部分，本文从概念上简明扼要介绍了MPLS的体系结构。     

网络简化与多业务交换

PSTN（公用交换电话网）将逐渐向分组化和宽带化的方向演变,在演变过程中,PSTN的网络简化与采用多业务交换平台,将起重要的作用。文中对这两方面作一简要介绍,说明网络简化的目标和应考虑的实际问题,包括远端交换模块和转接局、网关局的合理配置,以及大容量交换系统的选用。并以E-Cube多媒体交换系统为例,说明窄带STM（同步传送模式）和宽带ATM（异步传送模式）的综合交换,窄带业务与IP的结合,以及ATM与IP的结──MPLS（多协议标记交换）。这种多业务交换平台用在ATM／IP骨干网的边缘级,将有利于PSTN与各种新型网络互通。     

本地多点分布业务系统的体系结构及其关键技术

介绍宽带固定无线接入技术——LMDS的体系结构及其关键技术。     

多业务宽带交换（续）

3.ATM网络 八十年代末ITU-T确定ATM作为实现B-ISDN的技术,到九十年代末,ATM技术在LAN方面受到千兆比以太网技术的挑战;在WAN方面受到千兆比路由器技术的挑战,很多人目前对ATM的评价是:不切实际。     

从电信网的演进看多业务承载技术的发展

将电信网络的发展过程归纳成一张电信网络演进路线图。并进行分析。得出的结论是：目前在多业务承栽研究方面，电信运营商应把研究重点放在IP over SDH技术上，探索如何通过现有技术的功能整合实现SDH对多种基于IP的业务的高效支持；同时要跟踪基于分组交换技术的网络传输技术的发展。     

xPON系统的多业务接入体系结构与机制

1 IP应用推动接入体系架构演化 在xPON作为新媒体探索接入手段的同时,接入网体系架构也在各种接入技术手段和各种业务与应用的推动下完成了重要转换.Ethernet技术的进步为这种转换创造了条件,其作为一种技术载体,在实现新一代的接入网架构中,具有很大的优越性.     

小体积 大容量 少维护 多业务——朗讯科技的LambdaUniteMSS多业务交换传输设备

电信走入了薄利时代，每一个精明的运营商在考虑自己网络投资的规模时，都会想用每一分钱去换取最大的获利。他们总想要求这么一种近乎完美的设备．它拥有极高的性价比，在小小的空间里却可以完成以往好几排设备所有的功能。可另一方面，运营商投资规模的减少，电信市场规模的缩小却又使得许多大型的设备供应商不得不缩减在研发新设备，开发新技术上的投资。这似乎使得电信运营商的这一梦想成了泡影     

光突发交换宽带多业务接入技术探索

文章探索了一种以低廉价格实现多业务高速接入的光突发交换(OBS)接入网方案,方案采用OBS技术实现多业务传送平台.文章介绍了该方案的网络架构、边缘节点和核心节点的结构,以及基于多协议标签交换(MPLS)的控制平面和数据平面的软件架构;重点研究了一种在边缘节点处权衡带宽利用率和实时业务延时要求的业务分类和调度机制,利用该机制可以实现满足不同业务要求的多业务高速接入,并可根据实时性业务低延时的要求来合理地分类和设置最大等待时间.     

Multiservice Ethernet access

Ethernet is evolving from its origins in the local area network into a cost-effective and reliable wide area network technology. Market research shows that business customers are moving away from traditional leased lines and selecting Ethernet as the access network technology of choice due to its low cost, simplicity and flexibility. Developments in Ethernet technology are now offering service providers the opportunity to deliver cost-effective carrier class Ethernet services. In particular, a new generation of Ethernet network termination equipment (NTE) is emerging which provides remote management, flexible bandwidth and fault diagnosis while supporting access to multiple services delivered over a single physical connection. This paper describes the advantages and potential cost savings of using Ethernet in the access network. A case study for a city demonstrates significant capital expenditure cost savings and highlights the advantages of using new Ethernet NTEs, which can be up to ten times cheaper than SDH technology, delivering equivalent bandwidth. Remote management and fault diagnosis features can also reduce operational expenditure by avoiding unnecessary site visits. A network architecture is presented which supports delivery of Ethernet services over a combination of circuit-switched and packet-switched domains. New standards which are maturing in the IETF, IEEE and ITU to support Ethernet delivery of interoperable services with carrier class reliability are also discussed.     

一种自选路由ATM容错交换网络

本文提出一种自选路由ＡＴＭ容错交换网络结构，网络通过在基准网的级间增加交换单元来增加输入到输出间的通路，进而达到容错的目的，它具有选路简单，可提高交换网络性能的优点，与同等硬件量的其它容错方案比较，它可容纳更多的网络内部故障，且随着网络规模的增大，效果更明显。     

Electronic Switching Systems in Japan

A recently introduced large-size commercially available electronic switching system has versatility in application to different hierarchies of switching stages and is available not only in the telephone systems, but for forthcoming new telecommunication services such as video telecommunications, data applications, mobile radio telephones, etc. Successive developmental programs are now in progress for remote control switching systems, a small-medium-size electronic switching system and data-switching systems. In the international telecommunication field, an electronic telegraph switching system has been completed and electronic telex and telephone switching systems and a data-switching system are now under development. This paper describes some features of various electronic switching systems available in Japan for domestic and international telecommunications.     

企业多元融合网络

1.多元融合网络的网络架构 企业多元融合网络包括企业多元融合的园区网络、广域网络,以及企业的多媒体应用系统.     

基于SDH的多业务传送平台

现有网络存在多种不同的业务网，每种业务网只能提供单一的服务，介绍基于SDH的多业务传递平台，这是一种TDM／ATM／Ethernet混合传送的解决方案，具有明显的优势。     

Stabilization of Discrete-Time Nonlinear Switching Systems

This paper presents sufficient conditions for the stabilization of saturated switching nonlinear discrete- time systems. The type of nonlinearity is the so-called Lur’e type. Less conservative stability regions are obtained. This fact is shown upon a numerical example.     

通信网交换系统的发展趋向

本文对宽带综合通信网交换系统几个主要方面技术的发展趋向作了概括介绍，内容包括：电子交换的分布结构、ＡＴＭ交换的开始应用，个人通信的无线进网，宽带交换引用光子技术和多媒体交换结构分析。     

Switching Characterization of Cascaded Multilevel-Inverter-Controlled Systems

In this paper, the method of triangular carrier switching control of two-level inverters is extended to cascaded multilevel inverters using phase-shifted multicarrier unipolar pulsewidth modulation (PWM). The condition for smooth modulation is obtained using the Bessel's function representation of the PWM output and the switching condition of the multilevel-inverter-controlled system. A method is proposed for the determination of the minimum amplitude of the triangular carrier for smooth modulation at fixed switching frequency. It is shown that the multilevel modulation based on the phase-shifted carriers significantly reduces the ripple magnitude in the switching function and allows the use of a smaller carrier amplitude under closed loop. This increases the forward gain and, hence, improves the tracking characteristics. The proposed cascaded multilevel inverter control is implemented for the operation of a distribution static compensator (DSTATCOM) in the voltage control mode. The experimental verification of the theoretical and simulation results is provided through a field-programmable gate array (FPGA) based control of a laboratory model of a single-phase DSTATCOM.     

A Super-Tripling Technology Used in Radio-Over-Fiber Systems for Multiservice Wireless Signals Within a Millimeter-Wave Band

A super-tripling technology used in radio-over-fiber systems is presented in this letter for the optical generation and multiplexing of multiservice wireless signals within a millimeter-wave band. To realize the technology, optical carrier suppression is followed by optical single sideband with suppressed carrier modulation in the central station and optical stopband filtering in the base station is utilized. With the technology, 38.5-GHz amplitude shift keying and 41-GHz differential phase-shift keying signals both with 1.25-Gb/s data bit rate were demonstrated experimentally, and power penalties of about 1 dB at a bit-error rate of $10^{-8}$ were obtained after both signals transmitted over 10 km fiber. The spurious-free dynamic range of the link was measured to be 65 $hbox{dB}cdothbox{Hz}^{2/3}$ for the 38.5-GHz channel and 70 $hbox{dB}cdothbox{Hz}^{2/3}$ for the 41-GHz channel, both with the phase-noise at about ${-}$70 dBc/Hz.