黑龙江国脉通信电缆有限公司以铜包铝（CCA）为导体的市话通信电缆正式批量生产

黑龙江国脉通信电缆有限公司在2006年连续成功试制出铜包铝（CCA）为导体的5对、10对、100对市话通信电缆。经检验。以上产品的电气性能和机械性能等全部指标完全符合以铜为导体的市话电缆国家标准,此项产品投入市场大大降低了市话电缆的生产成本。     

市话通信光缆的选型

市话通信网分市话中继网和用户网.我国市话通信网中的电缆线路主要应用铜芯纸绝缘对绞铅包电缆和铜芯聚乙烯绝缘对绞塑料电缆.局间中继电缆大部份采用0.5、0.6、0.7mm线径铜线,用户电缆大部分采用0.5mm线径铜线,部份采用0.4mm线径铜线.今后将逐渐采用铜芯聚烯烃绝缘铝塑综合护层市话电缆来代替铜芯纸绝缘铅包电缆.     

提高ADSL接入方式铜缆出线率的措施

随着信息技术的飞速发展，技术的不断创新，市话电缆已不再只是传输语音信号，如何提高铜缆出线率，基于市话电缆开通ADSL已成为目前迫切需求，本对目前市话电缆存在的问题做了定性分析，并提出一些解决措施。     

用户电缆对XDSL适应能力的调查(下)

5 NTT公司对数模兼收的市话电缆的串音特性测试 为了摸清市话电缆对数据通信的承载能力,日本NTT公司在前些年对模拟和数字通信回路兼收的市话电缆,进行了大量的测试工作。现对其测试结果进行介绍。 1． 市话电缆线对的串音途径 在数、模混合电容的市话电缆内,线对间的串音途径如图6所示。图中外来串音主要是无线电中波干扰,电缆芯线接续点的瞬断,仅发生在纸绝缘、芯线接续采用手扭方式的情况下,对全塑电缆,由于芯线采用接线子方式,因此不大会产生瞬断现象。 图中DSU为用户数字线路终端设备、OSU为局内数字线路终端盘、SLT为用…     

用户电缆对xDSL适应能力的调查（下）

为了摸清市话电缆对数据通信的承载能力,日本NTT公司在前些年对模拟和数字通信回路兼收的市话电缆,进行了大量的测试工作。现对其测试结果进行介绍。     

全塑市话电缆的供求形势及市场走向

文中简要论述了我国全塑市话电缆的市场需求趋势、生产状况，分析了全塑市话电缆的生产能力与供求关系。并就进口电缆以及亚洲通信电缆市场的形势作了简要分析。     

全塑市话电缆对ADSL传输的影响及改进措施

本文通过济南本地网内市话电缆的现状，分析全塑市话电缆对ADSL传输的影响，提出相应的改进措施。     

浅谈宽频市话电缆

分析了目前在市话电缆上开通ADSL上存在的不足，详细介绍了新型宽频市话电缆的主要工序和特点，以及与原电缆的数据对比。     

全塑市话电缆绝缘电阻分析

本文对影响全塑市话电缆绝缘电阻的诸方面因素进行了深入的理论分析；介绍了绝缘电阻的测试及其意义；结合实际阐述了提高全塑市话电缆绝缘电阻的有效途径。     

市话铜线电缆的开发应用

介绍了国内外应用市话铜线电缆开发宽带接人网的现状(包括标准化和市场两个方面)及其发展前景对市话铜线电缆的进一步开发和应用进行了分析并提出了一些建议。     

Bring home the Internet

In the good old days, the only two-way communications link with a residence was provided by the local telephone company (telco). But the growth of the Internet and the passing, in the United States, of the Telecommunications Act of 1996 have changed that tradition. Today, a competitive local exchange carrier can compete in the turf of the local telco, now called an incumbent local-exchange carrier. In addition, cable TV operators are allowed to offer telephony and Internet access services to their subscribers along with TV programs. The question of who will supply the `last mile' pipe to the home could lead to some of the toughest fights the communications marketplace has ever seen. Winners will gain the revenues from supplying a cornucopia of phone, TV and Internet services. The paper discusses these issues as well as asymmetric digital subscriber line, cable modems, service billing, wireless connections, and power grid use for optical cable laying for communications     

数字电视有线传输技术分析

主要介绍了有线数字电视传输技术中的数字码流直接传输方式和QAM调制后RF传输方式,通过进行分析和比较,前者适合省市以上有线数字电视联网的应用,后者适合地市以下有线数字电视联网的应用,从而为不同地区制定数字电视建设方案提供参考。     

Cable: it's not just for TV

Hybrid fiber-coaxial-cable systems can download data from the Internet at up to 30 Mb/s while also carrying multiple telephone channels and broadcast radio and TV signals-both analog and digital. This paper concentrates on single-access technology-cable modems. The cable modem packs the Internet data in the form of 10BASE-T frames, which are fed over an Rj-45 connection to the Ethernet network interface card (NIC) in a computer. The phone connections at the cable modem are for Internet protocol (IP) telephony, which has yet to come to residences in a big way. The connection between a cable modem and the Internet is packet-switched and so the link is always active. The standards for cable modems are discussed as is the sending of digitised voice over a packetised system     

下一代有线数字电视用户驻地网结构仿真

介绍了下一代有线电视用户驻地网的结构、物理层及数据链路层配置、仿真建模,并对仿真结果进行分析,认为以太网交换器作为核心的星型结构,可满足网络传送高清电视、IP电话和网页的需求.     

US phone companies set stage for fiber to the curb

From almost the dawn of the Internet, phone and cable companies have been fighting for the hearts and minds of the savvier consumers all over the world. The key battleground is the so-called last-mile link to the home or business, where the phone companies have been pitting their digital subscriber lines (DSLs) against the cable providers' cable modems. In most places in the world, DSLs have been the more popular option, though in the United States, with its very large cable infrastructure, cable modems have had a distinct edge. All along, however, the Holy Grail has been fiber to the curb-an all-optical link going right into homes or businesses and providing bandwidth and speed that just can't be beat. Now, three of the four US regional Bell operating companies (RBOCs, or Baby Bells)-Verizon, BellSouth, and SBC-intend to start building such fiber-optic networks to the premises as early as the first quarter of 2004. Verizon Communications has by far the most ambitious plans: it says it intends to provide every home and business it serves with a fiber-optic connection during the next 10-15 years, at an estimated total cost of as much as US $40 billion. Verizon, BellSouth, and SBC got together and agreed on a common set of specifications for fiber to the curb. They are considering responses from vendors to their requests for proposed equipment built to those specs.     

地县广播电视台向无线数字发射站传送节目的技术方案

随着广播电视地面无线数字发射站建设的加快推行,本地广播电视台的数字节目需向发射站远程传送,目前主要依靠光缆传输和数字微波手段实现,在实施的过程中,需要综合考虑当地的网络状况、传输距离、设备选型、价格指标等多种因素,制定适合本地的传输规划方案,以保证电视节目的可靠传输。     

Loop survey in the Taiwan area and feasibility study for HDSL

About 2800 lines out of a total of 8,500,000 subscriber lines in Taiwan have been sampled and characterized. Various kinds of physical compositions and transmission characteristics were investigated and measured. It was found that the near-end crosstalk (NEXT) loss of Taiwan's subscriber loops is about 10 dB worse than that of US local loops. A corresponding new foam-skin PIC cable is proposed to reduce the NEXT loss. The new type of cable will be used to replace the paper cable and old foam-skin PIC cable step-by-step. Based on the measured data, the feasibility of HDSL (high bit rate digital subscriber line) service in Taiwan is studied. To improve the HDSL service distance via the existing subscriber lines, several cable models are discussed and suggested     

基于嵌入式流媒体服务器的视频点播系统

移动通信网络流媒体服务资费较高,限制了人们在没有有线电视、宽带互联网连接、无线WiFi互联网连接的地方用手机收看视音频节目.针对这一现状,提出了一种基于嵌入式流媒体服务器的多功能视频点播系统.以ARM板和WiFi网络适配器作为流媒体服务器,设计一款Android手机播放器作为客户端,实现在智能手机上、多个客户端同时免流量接收服务器本地或外接设备推送的高清、超高清视频.该系统适用于公交、广场、电梯、商场、景区等场合,人们用手机观看视音频,实现不用耗费自己的流量,自由快速地选择自己喜欢的节目.     

有线数字电视信道编码技术

在传输有线数字电视信号的过程中,为保证信号正常无误地传送,采用的核心技术就是有线数字电视信道编码技术。在介绍有线数字电视及信道编码的基础上,详细分析讨论了有线数字电视信道编码中的数据随机化、RS编码和卷积交织等技术的原理及其参数的意义。     

西部县域有线数字电视发展的思考

随着广播电视技术的发展,如何因地制宜应用网络化、数字化来丰富频道资源,使节目信息更加通畅、交流更加便捷、功能更加完善,是目前各级广播电视部门亟待解决的问题。结合本地区广播电视的发展实际,探讨发展有线数字电视的重要性和具体对策。