订户接口

在为订户接线时应安装二个盒子：室内装一个频道识别器，室外装一个可寻址开关。室外的盒子可以是新建或现有设施分支器的一部分，位于分支器端口与订户家之间。室内的盒子有多种设计方式，根据是否有转换器及订户电视     

基于SJA1000的雷达信号处理机接口设计

SJA1000芯片是Philips公司的一种有效支持分布式控制或实时控制的CAN总线控制器芯片.介绍了采用SJA1000芯片的雷达信号处理机接口的硬件设计和软件设计,给出了发送节点的程序流程.     

数字电视输出接口参数测量

本文介绍了数字电视输出接口参数测量方法；输出接口HDB3编码；2048kbit／s、8448kbit／s、34368kbit／s、139264kbit／s接口输出信号波形；CMI编码：和输出接口信号速率偏差指标等。     

具有双电流限值的以太网供电接口控制器

LTC4257-1为在IEEE 802．3af以太网供电系统中工作的器件提供了完整的签名和电源接口功能。它通过将25kΩ特征电阻器、分级电流源、输入电流限值、欠压闭锁、热过载保护、特征电阻器失效以及电源状态良好信号指示全部集成在一个8引脚封装中，而使受电设备设计得以简化。LTC4257—1采用了一个精准的双电平电流限值电路。这使得它能够在保持与当前IEEE 802．3af规格的兼容性的同时对大负载电容器进行充电，并与老式的以太网供电系统相连。通过采用一个片内高压功率MOSFET，LTC4257—1不仅能够为系统设计师降低成本，还能够节省电路板的占用空间。     

蓝牙主控制器接口简析

介绍了蓝牙主控制器接口(HCI)规范的内容,着重描述了对HCI的功能分析。HCI提供对基带控制器和链路管理器的命令接口以及对硬件状态和控制员的访问。该接口还提供对蓝牙基带的统一访问模式。     

电致发光显示屏接口电路设计

介绍一款电致发光显示屏接口电路,它采用普通小型LC D接口,可以利用I2C接口和并行接口与外界通讯。该接口电路采用单片机处理显示数据;利用C PLD产生显示控制信号,采用"乒乓操作"对数据流进行控制。除介绍接口电路的硬件结构外,还讨论了单片机的开发程序设计流程。最后介绍了点阵显示器相关字库的生成和有限字符集的查表译码方法。     

几种数字视频接口的发展及应用

简述了几种模拟、数字视频接口标准及技术，重点对HDMI和DisplayPort数字视频接口技术优势及应用前景进行分析。     

用PLD设计高清晰度电视帧缓冲器接口

设计背景 高清晰度电视(HDTV)是在世界范围引起广泛重视的一种高新技术,它将把电影院的声象效果带入家庭。然而,除了在消费类电子领域中之外,HDTV在商业和军事上也将得到广泛应用,例如,美国宇航局(NASA)正在探索利用HDTV把在     

基于FPGA的VGA接口驱动技术

VGA(视频图形阵列)作为一种标准的显示接口得到广泛应用。依据VGA显示原理,利用Verilog硬件编程语言作为逻辑描述手段,设计了一种基于现场可编程器件FPGA的VGA接口控制器。主要是对于系统时序的控制,完成对整个显示器的扫描,利用FPGA的高频率时钟优点;在使用FPGA的嵌入式系统中能代替VGA的专用显示芯片,节约硬件成本,节省计算机处理时间,加快数据处理速度并具有显示面积大、色彩丰富、承载信息量大、接口简单等优点。最后利用ModelSim进行仿真运行,得出与资料相同的时序波形。     

Subscriber line interface circuit LSI fabricated using high-voltage CMOS/SIMOX technology

High-voltage buried-channel CMOS/SIMOX technology which is characterised with the existence of an electric-field-shielding layer formed by oxygen implanatation was applied to fabricate a BSH-LSI for a subscriber line interface circuit, providing three functions of battery feed, supervision and hybrid. In this CMOS BSH-LSI, a high breakdown voltage of higher than 60 V and a low breakdown voltage of 15 V were fabricated by the same process. This BSH-LSI showed a high level of performance during operation. The chip size and dissipation power of the BSH-LSI were reduced to approximately one-third and one-half, respectively, compared with a conventional BSH-LSI fabricated with bipolar technology.     

浅谈用户管理系统

有线电视行业多年来一直采用包月制的粗放型经营体制,数字电视可以实现端到端的控制,通过建立和使用用户管理系统(SMS,Subscriber Management System)将使有线电视管理由粗放型管理走向集约化管理,大大提高广播电视的管理水平和服务水平。     

A Digital Subscriber Set

The Electronics Research Laboratory at the Norwegian Institute of Technology has since 1974 studied PCM-transmission in the local subscriber plant. A short discussion of this work is presented together with choice of design parameters and concept for a digital subscriber set. Construction and laboratory testing of the digital subscriber set are described. The paper concludes with a discussion on future development.     

用户环路接入网

介绍了用户环路接入网的概念、结构及接口的演变等。对Ｖ５接口和采用Ｖ５接口及光纤接入网的方式作了具体的论述和介绍。     

Rural Subscriber Physical Loops

This paper briefly traces the development of physical subscriber loop design in the Rural Electrification Administration (REA) Program from 1949 to the present. Development of equipment for overcoming in the most economical manner the signaling and transmission problems encountered with long subscriber loops is also discussed. This includes loading systems for wider bandwidth, better structural return loss, less bridging effects with multiparty lines; loop extenders in place of costly long-line adapters (LLA's); lower cost voice-frequency repeaters (VFR's) and switching methods such as Common-Mode Operation (CMO) where less equipment is required. Discussion of the problems still encountered with transmission and signaling on rural subscriber loop is presented with ideas for solution. Development of VFR equipment with automatic gain control for use in CMO or Common-Control Central offices would permit designing to common circuit net loss and minimize contrast between circuits. Extension of signaling limits of central office equipment (COE) now being developed could eliminate the need for external loop extension equipment on better than 90 percent of rural subscriber loops. Development of a telephone instrument requiring less dc line current would eliminate the need for elevated line voltages.     

不对称数字用户线（ADSL）

本文对不对称数字用户线（ＡＤＳＬ）的基本概念，所能提供的宽带业务、技术性能、系统组成作了和说明，并指出利用ＡＤＳＬ，把宽带信息沿普通电话线（铜线）送到千家万户，是数十年时间内过渡到光纤到家（ＦＴＴＨ）的有效传输手段。     

Millimeter Wave Subscriber Loops

Advantages and drawbacks of using millimeter waves in the telephone and data subscriber distribution network are listed. Fields in which it seems attractive to use millimeter wave loops are examined. For such applications, cost and reliability constraints led to the design of very simple systems. Two systems will soon be introduced into the French subscriber plant. The first one will be commissioned in 1983 to connect groups of remote subscribers, working at 31 GHz, using a homodyne millimetric front end. The second one, still under experiment, is designed for the connection of subscribers of the integrated service communication network; working at 23 GHz, it uses time-division multiplexing to assume duplex operation. The most drastic constraint when setting up such systems is the line-of-sight requirement. Investigations of that problem, using computer-aided coverage map plotting are discussed.     

用户环路宽带化的进程

本文介绍了几种主要的接入网技术并对其特点和特色加以比较，另外，介绍了一些国家光纤用户环路的进展和实施计划。     

光纤数字用户环路系统

简要介绍了国际上光纤数字用户环路的发展概况及我们新近研究成功的光纤数字用户环路系统的原理、特点和功能