运用接入新技术组建农村用户接入网

对接入网的基本概念和V类接口作了说明,介绍了接入技术的发展动向,对组建我国农村用户接入网的有关策略进行了论述。     

运用接入新技术组建农村用户接入网

在对接入网的基本概念和Ｖ类接口作了说明后，对接技术的发展动向作了简介，并运用接入新技术对组建我国农村用户接入网的有关策略进行了论述。     

运用接入新技术,组建农村用户接入网

运用接入新技术组建农村用户接入网已势在必行。本文针对我国经济水平低、地区间发展不平衡等实际情况，对组建我国农村用户接入网的有关策略进行了论述。     

用户接入网介绍及应用

用户接入网是目前通信网建设中的新兴领域.本文就用户接入网的引入及发展动态作了分析和探讨,并结合江苏省用户接入网的有线和无线接入建设进行简单介绍.     

基于CATV网的宽带用户接入网

本文介绍了用户接入网这一当前通信热点的现状及其发展趋势，并进一步就当前用户网接入方式的发展主流－光纤／同轴混合方式作了详细的探讨，最后还对发展我国用户接入网提出了一些看法。     

农村接入网建设的几点考虑

重视农村接入网的规划目前中国的本地电话网,基本完成了交换网和局间传输网的数字化,乡镇以上已经实现了局间的光缆化。用户接入网是电信网的基础,也是信息高速公路的“最后一公里”。虽然在农村大部分地区,用户接入网主要还是解决农村用户的通话问题,但随着电信网数字化、综合化、宽带化的发展,尤其是SDH、ATM／IP技术的日益成熟和推广,各种非话业务将会得到迅速发展,接入网工程完全以传统的以双绞线接入电话业务为主的用户网络已不能满足电信业务的需求。与城市一样,大量的铜缆直接接入将在不久的将来成为农村通信网发展的“…     

对农村采用接入网和远端模块的一点思考

对农村采用接入网和远端模块的一点思考程鸿雁周立宇侯立朋光纤用户接入网以光纤接入的方式，使用户设备尽可能地接近用户，这样做既可以大幅度地减少线路投资，又可以提高通信质量。除此以外，光纤用户接入网还可以提供多种业务，如既可以提供传统的电话业务，也可以提供...     

关于现代通信的用户接入网

简要介绍了用户接入网的定义及其特点；阐述了现代接入网技术的发展以及光纤接入方式、光纤同轴混合接入方式、高速数字用户环路、非对称数字用户环路、无线本地环路等５种主要的接入方式。     

浅谈用户接入网及其在石首市电信网中的应用策略

介绍了用户接入网的基本概念及几种接入方式,并简述了石首市组建用户接入网的基本策略。     

接入网设备的112测试

接入网的引入一方面促进了光纤靠近用户 ,能提供配置灵活、具有宽带能力的接入方式 ;另一方面由于带有Ｖ５接口的交换机不再承担对用户线的管理和维护 ,使原来简单的用户接入段发展成为复杂多样的传输系统。因此 ,必须首先解决通过Ｖ５接口接入的用户的集中维护问题 ,包括故障管理 ,确保不因接入网设备的商业化而引起服务质量下降。正因为接入网的灵活程度和服务质量直接关系到电信企业的声誉,而光纤接入网由于其技术的特殊性,故接入网用户的１１２测试就成为衡量光纤接入网设备性能的重要参数之一。１光接入网定义１．１接入网定义整个电…     

广东省宽带通信网建设及其发展的考虑

本文介绍了广东省宽带通信网的建设方案和设想，提出应根据ＡＴＭ交换技术的发展状况逐步发展ＡＴＭ交换网。在接入网方面，ＡＤＳＬ因具有较好的性能价格比且可以利用现有电视用户配线，成为目前较为理想的接入网产品；ＨＦＣ网络则不失为在农村地区的一种经济、灵活的发展模式。ＩＴＶ业务与宽带数据通信是目前宽带通信网的主要应用，它们的发展趋势是走向融合。     

农村地区接入网建设建议

本文根据近年来我国农村地区通信发展的态势,在一线调研的基础上,主要从农村地区接入网建设的角度出发,分析农村地区接入网发展的现状及存在的问题,从市场、技术、运维等角度提出今后农村地区接入网的发展策略,并提出一系列有争议的技术的取向及具体的网络建设原则和建议.     

2G/3G互操作网络优化原则与策略

在进行TD-SCDMA网络建设时,利用现网资源和用户资源,实现网络以及用户体验的平滑过渡。2G/3G互操作主要解决混合组网过程中碰到的网络驻留、小区选择、小区重选、切换以及用户接入控制和转网策略等问题。     

对光纤用户接入设备的探讨

介绍了用户接入网的发展, 光纤用户接入设备的组成和功能, 光纤用户接入设备与交换机远端用户模块、用户数字环路设备的比较,以及光纤用户设备引入对本地网建设的影响。     

Novel algorithm for time division multiple access in broadband ISDN passive optical networks

For shared access to a broadband communication network using the asynchronous transfer mode (ATM) a passive optical network (PON) has previously been proposed. A novel algorithm to evaluate the time division multiple access (TDMA) protocol which controls the traffic from the various subscribers towards the shared access equipment (upstream direction) is proposed. It uses counters to estimate the moment of a data packet arrival at the subscriber side. By this ‘look-ahead’ technique no extra upstream channels are needed to initiate the polling by the subscriber. The algorithm guarantees fair access for all subscribers and minimizes the necessary overhead. Both the maximum access delay and overhead may be readily calculated, and the obtained results were supported by numerical simulation. Applicability in the standard broadband network environment has been proved by hardware design simulation.     

Development of the urban and rural transmission networks in Russia

The paper describes the main characteristics of the transmission networks that are used in the urban and rural areas. Existing principles of the urban and rural transmission networks' creation are given. The subscriber transmission network is considered. The St. Petersburg transmission network is analyzed as an example of an urban transmission facility. Aspects related to commercial network creation are briefly discussed     

The fiber-optic subscriber network in Japan

Nippon Telegraph and Telephone Corporation (NTT) has two primary aims regarding the installation of optical fiber cables for subscriber networks as the access network: to provide high-speed broadband services, and to provide narrowband services through optical fiber cables with subscriber-line multiplex technology. Thus, NTT is preparing an infrastructure to support the forthcoming B-ISDN subscriber networks. NTT has been developing technologies for implementing the full-scale construction of fiber-optic subscriber networks. The present article describes the deployment methodology for these networks, their current status, and plans for their future development     

Design Philosophy and Hardware Implementation for Digital Subscriber Loops

This paper presents various requirements and configurations in the information network system (INS) NTT's version of the integrated services digital network (ISDN)- such as field trials, and technologies and equipment design of the digital subscriber loop using balanced wire pairs. The main aspects characterizing digital subscriber loops, are a customer access structure, a digital transmission system on existing subscriber loops, and customer interface. A configuration of two-wire digital subscriber loops with two customer access channels, which is adopted in the field trials, will be described. The time-shared two-wire digital transmission and power feeding methods on subscriber loops are discussed. The common mode rejection ratio (CMRR) is discussed in detail, since CMRR is one of the main factors which affects the transmission ability of balanced wire pairs. A proposed self-clocked four-wire customer interface utilizes time division multiplexing technique. The digital subscriber loop operates on a call-by-call basis for link establishment to avoid excessive power dissipations as well as to avoid impairments caused by crosstalk from other lines within a cable. Its design objectives and implementation are also discussed.     

农村WLAN覆盖解决方案

随着农村信息化工作的不断深人,农民上网需求越来越大,而农村宽带网络覆盖程度较低,运营商的服务已经无法满足客户需求.WLAN有着建网速度快、建设成本低的特点,因此在农村部署WLAN势在必行.     

光纤用户接入网的可靠性研究

提出了研究光纤用户接入网可靠性的一般方法,探讨了光纤用户接入网的连通性,由网络生存性的角度提出了适用于光纤用户接入网的组网与保护方式。