交互式数字视频网络商用的启示

目前，世界各国都正在加紧进行为住宅用户提供交互式视频业务的宽带网络试验，由于这些试验及其小规模的商用均没有充分利用网络新应用和新业务的能力，因而缺乏吸引力，此外，近几年迅速崛起的因特网对当前徘徊不前的宽带视频网络也产生了相当大的冲击作用。文章主要就美国新不下班我佛城推行的光纤－同轴电缆视频拨号交换网商用中所取得的经验教训作了分析和研究。未来的宽带网络应该朝着在较低的使用价格上综合视频护拨号网和因特     

Quidway A8010 Expert多业务综合接入平台

1目前因特网业务的现状和前景分析1.拨号接入方式仍处持续发展阶段：根据2002年1月15日中国互联网络信息中心（CNNIC）在京发布的第九次《中国互联网络发展状况统计报告》，我国网民已经达到3370万人，其中拨号用户为2133万，约占网民总数的63%，2001年新增拨号用户590万，拨号用户增长率为38%。拨号用户的增长率虽逐年放缓，但是由于拨号费用低廉、接入方便，在未来的几年内仍是上网的主要形式。2.拨号业务也是目前少数几个能盈利的业务之一：窄带拨号投资少、周期短，而且技术成熟、运营成本低，是运营商非常稳定的利润来源之一。目前窄…     

用于住宅多媒体应用的分布式宽带市域网

1.引言 在不远的将来,住宅多媒体市场会发展成为一个非常有潜力的电信市场。借助分布式多媒体技术和宽带通信技术,住宅甩户希望能在自己家中享受按需提供的全套多媒体业务。通过混合光纤、同轴电缆环路将电影节目的视频拨号业务中的一种送到住宅用户家中便是一个例子。目前,新型视频业务的试验正在规划和进行之中,这股多媒体潮流将彻底改变现有的电信基础设施。     

CM-IMS点击拨号技术研究

点击拨号业务通常是指由PC侧发起、以手机或固话终端作为主被叫听筒的通话业务。用户通过鼠标点击动作即可由网络侧主动向通话各方发起呼叫,各方用手机或座机应答接通后即可建立通话。广义的点击拨号还包括WAP、短信、手机客户端发起的呼叫业务。CM-IMS是中国移动下一代网络架构,基于CM-IMS开展的点击拨号业务,在实现点击拨号业务功能的同时,更具有ICT融合的应用方式。本文对点击拨号业务的场景与业务体验、系统架构、业务流程等进行介绍。     

江苏电信、上海电信完成IMS试点省际互通

近日,江苏电信苏州IMS试点率先打通了苏州到上海的IMS省际电话,并基本完成了中国电信IMS的省际互通测试。江苏电信与上海电信通过省间IMS网络对两省IMS用户间的互拨、漫游呼叫、计费功能和业务体验等进行了全面的验证,其中业务功能包括语音业务、补充业务等传统PSTN业务,以及点对点的视频通话、3G手机视频通话、多媒体彩铃、融合多媒体会议等IMS多媒体业务,覆盖了多种用户终端的各种应用场景。此外,江苏电信还在现网进行了Web点击拨号业务、IMS融合视频会议系统与新视通会议系统互通等测试验证。     

对程控电话有关新业务软件的小小改进

对程控电话有关新业务软件的小小改进天津市蓟县邮电局刘子冬随着程控电话的发展，类似缩位拨号、热线服务、呼叫转移等新业务也走进了家庭，但有时用户使用起来并不满意，例如：某用户想把０５４０２２２５５０做成缩位拨号“２５”，但在话机上操作登记以后，使用“２５...     

新品展馆

级4和级5软交换机ArgentNetworks公司宣布推出新型软交换机框架解决方案，其营销目标是针对级4和级5替换市场和无线市场。这种软交换机可用该公司的应用服务器进行预配置，提供预付费和后付费记帐、IP集中式小交换机、虚拟专用网、网关、1个号码和信息业务应用。此外，它还提供传统无线网或有线网与下一代IP网间的唯一整合，对用于固定和移动网的话音、视频和数据提供多项业务支持。它由地址转换、选路、IVR和三方呼叫控制等各种应用组成，支持呼叫等待、呼叫转移和快速拨号等各种级5业务。该平台易于部署，易于集成到不同的系统结构中…     

基于Parlay API的Web拨号业务的设计和实现

分析了基于ParlayAPI(ApplicationProgrammingInterface)技术的Web拨号业务的功能结构及业务的初始功能 ,然后结合Web拨号业务消息流程说明了业务处理功能 ,阐述了该业务的支撑功能。     

数据业务的OSS策略

1引言数据业务是近年来增长最快的电信业务，也是未来最具潜力的电信服务。数据业务的开发和普及虽然较快，但针对数据业务的运营支撑系统的建设和应用却显得相对滞后。由于数据业务的业务特点、营销方式以及网络特征与传统电话业务都有着显著的差别，所以有必要按照数据业务的特点为其订制适合业务发展和网络运维的支撑系统。2从OSS看数据业务2.1数据业务的业务特点从OSS（运营支撑系统）的功能实现，可以把数据业务分为以下几类：拨号访问提供的数据业务、以专线方式提供的数据业务和基于带宽数据增值业务。拨号访问的数据业务有窄带的…     

爱立信融合视频解决方案——全业务运营商业务腾飞的关键

端到端多层面融合视频解决方案 随着视频技术的不断发展和演进，全业务运营商会面临多种网络下视频的统一管理问题。如何整合移动视频系统、宽带视频系统和IPTV系统，降低运营商的CAPAX和OPEX，提供满足用户多样性业务需求的综合视频业务，是摆在全业务运营商面前的难题。针对市场的需求，爱立信在业界提出了融合视频解决方案，     

Integrated network management and control for interactive videodial tone networks

The emerging interactive video dial tone (VDT) services pose some unique requirements for real-time network monitoring and control. To support the roll-out of VDT-based networks and services, GTE is developing new network management applications on its TONICS (Telephone Operations Network Integrated Control System) platform. TONICS's applications are embedded in a high availability software platform providing distributed processing. The article describes the real-time management requirements of VDT networks, provides an overview of the TONICS integration platform, outlines a network management and control architecture for VDT networks, illustrates example VDT management applications, and discusses the deployment issues     

MPEG-2 over ATM for video dial tone networks: issues and strategies

Market growth for PC multimedia and digital video owes largely to the rapid adoption of ISO compression standards by the industry. For video dial tone (VDT) services, the MPEG-2 set of standards have clearly emerged as the preferred coding method for VDT networks. For point-to-point switched video or multimedia connections, ATM has emerged as the technology of choice for switching and transport. This article describes how compressed digital video is transported over a VDT network, what some of the issues are, and how they are being addressed by the industry. It describes a generic VDT reference architecture, and the delivery method of video and multimedia information over such a network     

MPEG—2标准在基于ATM的VDT网络中的应用

主要讨论视频拨号音（ＶＤＴ）网络模型，及ＶＤＴ网络的ＭＰＥＧ－２标准数字视频信号在ＡＴＭ网中传输存在的问题和应用。     

Operating and powering optical fiber network

Fiber-in-the-loop (FITL) systems enable the distribution transport of existing telecommunications services and future broadband services over fiber optic media. An FITL system comprises a host digital terminal (HDT) connected to some number of optical network units (ONUs) via a fiber optic passive distribution network (PDN). Each ONU provides metallic service interfaces via short drops consisting of metallic wire pairs or coaxial cable. FITL systems that carry plain old telephony services (POTS) are referred to as “POTS FITL” systems. FITL systems that deliver VDT services or combined VDT and telephony services are referred to as “VDT FITL” systems. There are a number of architectural alternatives for VDT FITL, including configurations involving the use of parallel technologies for transporting video signals in the distribution. The authors discuss network operations and powering in particular     

The voltage-doping transformation: a new approach to the modelingof MOSFET short-channel effects

It is shown that the influence of the drain-source field on the potential barrier height is physically equivalent to and can be replaced by a reduction in channel doping concentration according to a formula derived from the two-dimensional Poisson equation. The actual barrier height for any drain bias and channel length, on which the derived equation depends, can be calculated easily using well-known one-dimensional (long-channel) solutions. This simple but general procedure, called the voltage-doping transformation (VDT), is shown to lead to analytically calculated potential distributions in fairly good agreement with two-dimensional numerical simulation. An application of the VDT to threshold voltage (V_tj) calculations also is shown. The V_th model is compared with measurements taken on implanted n-MOSFETs with various channel lengths. Good agreement demonstrates the accuracy of both the VDT and the new V_th model     

A survey of electric and magnetic fields among VDT operators inoffices

The ambient electric and magnetic fields as well as the electromagnetic fields associated with video display terminals (VDTs) at 150 offices are measured. The aim of the study is to determine the general level of the various electromagnetic parameters in offices and establish a technical base for a case referent study of skin symptoms among VDT workers. The median value of the 50-Hz background field in the 150 offices is 0.07 μT. Seven of the offices have background levels higher than 0.5 μT, which is high enough to cause distortion of the picture on the screen. The dominant source for electric fields in the ELF range is electric equipment in the office, not the VDTs. The equivalent surface potential is less than 0.5 kV for 63% of the measured VDTs. The computer monitor is a major source of magnetic fields in the offices. The median value of the magnetic field in the ELF range in front of the VDT is 0.21 μT, and in the VLF range it is 0.03 μT     

A systems analysis for implementing video display terminals

The utility of a seven-step systems analysis model is demonstrated. This analysis addresses the safety and ergonomics problems associated with implementing video display terminals (VDTs). The seven-step analysis model consists of: defining the problems; setting the objectives and developing an evaluation criteria table; developing alternatives; modeling alternatives; evaluating alternatives; selecting an alternative; and planning for implementation. A detailed diagrammatic analysis of these steps is presented. Solutions to VDT problems are suggested using data gathered from case studies     

Refinement of the Subthreshold Slope Modeling for Advanced Bulk CMOS Devices

We present here a simple analytical model of the subthreshold slope of CMOS devices that successfully describes the long-channel plateau, the initial improvement for medium gate lengths, and the final degradation for short gate lengths. The model is based on the voltage-doping transformation (VDT) that leads to a new term in the subthreshold slope expression, explaining the degradation of the slope at very short channels. The potential minimum at the virtual cathode was expressed using a semiempirical expression that allows our model to fit to data that were extracted from simulation in a wide range of device parameters. Finally, the new slope model successfully reproduced experimental data that were measured on devices based on 90- and 65-nm technologies, demonstrating the validity of our model for advanced bulk CMOS technologies.     

Signaling challenges in video dial tone networks

Residential broadband networks present new signaling challenges as compared to the more traditional telephony networks. Access signaling protocols such as DSM-CC and Q.2931 for ATM, are evolving to meet these challenges. A desirable outcome will be a solution that supports seamless interworking among the newer video applications and the more traditional applications. First we examine the new requirements that arise when considering control of VDT networks. We then provide a brief review of the capabilities and development status of each protocol. Finally, we examine possible evolution paths for the development of broadband signaling. Our primary objective is to describe a signaling evolution path that integrates the requirements of both business and residential broadband networks, thus allowing partial or total sharing of network resources in support of both types of applications