用户线

通过IP网络延伸电话用户线

Extending subscriber line using IP network

甚高速数字用户线（VDSL）是数字用户线（DSL）家族中速率最高的接入方式。

Very-high-speed digital subscriber line ( VDSL ) is the fastest access technology of the xDSL family .

分析了非对称数字用户线的技术特点及其在Internet的接入和应用、发展前景。

Analyses the technical features of asymmetric digital subscriber line , applications and developable foreground on the Internet .

用ISDNU接口实现用户线环路扩容

Realize the expanding capacity of subscriber loopback with ISDN U interface

本文介绍了各种Internet接入技术或手段，其中包括专用线、模拟调制解调器、综合业务数字网、不对称数字用户线、线缆调制解调器，以及无线接入技术等等。

The article describes almost all kinds of Internet Access technologies and methods , which include leased private line , analog modem , ISDN , ADSL , cable modem , and wireless access , etc.

对利用现有用户线实现窄带ISDN进行了讨论；

Then how to realize N-ISDN by making use of the present user line is proposed .

不对称数字用户线（ADSL）是在现有电话用户铜线上以不对称速率传输数据的一种新技术。

ADSL is a new data transmission technology in asynchronous bit rate over the existing telephone copper lines .

采用变分法，对平均功率受限条件下的用户线的理论容量进行了估算，利用分别得到的白噪声和NEXT条件下的信道容量，给出了一般条件下用户信道的理论上限。

Finally , the capacity in theory when average power is limited is estimated . Then noise and channel capacity in NEXT is gotten and the ultra-limitation of subscriber channel in theory in general condition is presented .

介绍了一种通过IP网络将交换机用户线延伸的技术，使在监控中心也能直接检测电话系统的通话情况。

This paper introduces one way of extending the subscriber line through IP network , the use of which makes possible any direct examination of the communication process in the monitoring center .

EDSL是以太网数字用户线（EthernetDigitalSubscriberLine）的简称，它的主要特点是利用现代调制解调技术在电话铜缆上直接进行IP包的传送。

EDSL is the abbreviation for Ethernet Digital Subscriber Line , its main feature is direct transmission of IP packages in phone line by using modern modem technology .

甚高速数字用户线VDSL技术

The Technology of Very high rate Digital Subscriber Line

在ISDN用户线基本接入全双工传输系统的设计中，线路编码是重要的一步。

Line coding is an important step in the design of full-duplex transmission system to support ISDN subscriber line basic access .

高速数字用户线（HDSL）技术是通信网络多种接入技术中的一种。

HDSL Technology is one kind of multi-switch-in technology in communication network .

ADSL技术，即不对称数字用户线（AsymmetricDigitalSubscriberLine），是一种非对称的传输技术，通过不同的调制方法在铜缆上实现高速数据传输。

The ADSL technology , namely Asymmetric Digital Subscriber Line , is one kind of asymmetrical transmission technologies which realizes the high speed data transmission in the copper cable through the different modulation methods .

数字用户线（DSL）技术，就是解决这最后一公里接入瓶颈的主要技术之一。

The DSL is one of the mostly technology , which can resolve the problem ( we call it the last kilometer ) .

在数字用户线（DSL）系统中，每个符号在进行传输时要加入循环前缀（CP）以消除符号间干扰。

In DSL systems , a cyclic prefix ( CP ) was inserted before every symbol being transmitted , to alleviate the interference between consecutive symbols .

介绍了数字电话系统中用户线接口电路的一个重要电路&基于数字信号处理（dsp）和∑Δ调制技术的新一代编解码器（codec）。

This paper describes an important part of subscriber line interface circuit in digital telephone switching systems the new generation Codec based on DSP ( Digital Signal Processing ) and ΣΔ modulation technologies .

本建议为数字用户线（DSL）收发器交换能力和选择共同工作模式提供灵活的机制。

This Recommendation provides a flexible mechanism for Digital Subscriber Line ( DSL ) transceivers to exchange capabilities and to select a common mode of operation .

DMT（离散多音频）调制/解调是ADSL（不对称数字用户线）应用的标准传输技术。

The discrete multitone ( DMT ) modulation / demodulation is the standard transmission technique in the application of asymmetric digital subscriber lines ( ADSL ) .

比较了高比特率数字用户线（HDSL）、不对称数字用户线（ADSL）、光纤到路边（FTTC）、光缆同轴混合网的技术经济比及实用性。

It compares the technological economy ratio and practical applicability of HFC , HDSL , ADSL and FTTC .

不对称数字用户线（ADSL）的线路测试，基于窄带和宽带特性确定其故障。

Test of asymmetrical digital subscriber line ( ADSL ), based on POTS ( plain old telephone service ) and broadband character , is used to confirm the fault .

本文描述了高比特率数字用户线HDSL帧结构的基本组成、帧格式和不同帧之间的映射关系，并且简要介绍了它的实现方法。

The HDSL frame structure , frame format and frame mapping as well as its implementation are described in this paper .

在各种宽带接入方案中，数字用户线（DSL）技术由于通过现有普通电话双绞线线路提供高速的Internet连接，投资低、技术实现简单，从而一举成为宽带网络技术的主角。

Among all the technique of broadband access network , Digital Subscriber Line ( DSL ) which provides fast Internet access via the existing twisted-pair telephone wires , has become the leading actor because of its low cost and simple implementation .

本文系统研究了非对称数字用户线的理论，重点研究了国际上对其通用的编码方式&离散多音调制（DMT）技术。

We study the theory of Asymmetric Digital Subscriber Loop ( ADSL ), important in Discrete Multi-Tone ( DMT ) modulation that is the usual international encoder in ADSL .

随着互联网应用的不断拓展，客户网络应用需求和对网络接入的要求也在不断提高，传统的DSL（数字用户线）技术由于受带宽和接入距离的限制，已无法满足需求。

As the Internet application development , customer network application needs and to Internet access requirements are constantly improve , the traditional digital subscriber line ( DSL ) technology has failed to meet demand .

VDSL技术被视为不对称数字用户线（ADSL）的下一代产品&这是对ADSL概念的扩展，故其现在还处在研究阶段。

VDSL technology is considered as the next generation product of the Asymmetrical Digital Subscriber Loop ( ADSL ), which is the conception expansion of ADSL , so it is in the research stage .

本文讨论了建设宽带接入网的必要性，简述了在无源光纤网络、不对称数字用户线和有线电视光缆/同轴电缆混合网上实现宽带接入的方案，并探讨了BCDMA在宽带接入网中的应用。

The article discusses the necessity of the construction of broadband access network and describes the approaches of implemetation of broadband access over PON , ADSL and hybrid fiber coax network of CATV , coming up with a discussion on the application of B CDMA in broadband access network .

该产品主要应用于数字用户线访问复用器（DSLAM）、第三代无线地面机站、及各类光接入系统等宽带综合业务接入设备。

It is applied in device of broadband integrated service access , such as DSLAM , wireless station of3G , and all kinds of optical access system .

ADSL（不对称数字用户线）技术是在双绞铜线上进行视频通信的新技术，它采用DMT（离散多音调制）编码等传输技术，可为现有的电话用户提供宽带业务。

ADSL ( Asymnetric Digital Subscriber Line ) is a new technology for video communication over twisted copper pairs . By using DMT line coding , it could provide broad-band services for existing telephone customs .

介绍国内外数字用户线DSL业务现状、发展趋势、宽带测试需求分析以及ADSL宽带测试技术、测试项目、组网技术等。

This article discusses about DSL service status in quo , DSL service development , ADSL broadband test requirement analysis . It also deals with ADSL broadband test technology , test items and test network configuration technology , etc.