双绞线

DMT调制在铜双绞线信道上的输入功率分配

Input Power Distribution of DMT Modulation over the Copper Twisted Pair Channels

目前的接入网技术主要有基于金属线缆的xDSL技术、基于HFC的CABLEModem技术、基于五类双绞线的以太网接入技术，以及光纤接入技术和宽带无线接入技术等。

The current access network technologies mainly include xDSL access technology based on metal cable , Cable Modem access technology based on HFC , Ethernet access technology based on five twisted pair , optical fiber access technology and broadband wireless access technology .

一线网络是一种基于PC或者微控制器的，通过双绞线与一线元件进行数字通信的低成本的总线。

The 1-wire net is a low-cost bus based on a PC or microcontroller communicating digitally over twisted-pair cable with 1-wire components .

学生终端即基于μC／OS-Ⅱ的IP智能终端，通过双绞线与交换机实现和教师机的物理连接。

Student Terminal is an IP intelligent terminal based on μ C / OS-II , which can be connected with teacher computer , and Switch though twisted-pair .

DSL系统中双绞线电缆的测试和分析

Testing and Analysis Methods of Twisted Pairs Cable in DSL Systems

最大和最明确的VGA质量超过任何制造商双绞线。

Sharpest and clearest VGA quality over CAT5 of any manufacturer .

PROFIBUS现场总线网络层采用屏蔽双绞线连接。

The shield twisted-pair was used to link with PROFIBUS field bus network layer .

通常是通过双绞线实现，双绞线对于传输话音数据是足够的，但是对于像Internet这种网络的高带宽要求就显得力不从心了。

Traditionally this connection is a twisted pair of copper wires , which is adequate for telephone calls , but the wide scale introduction of the Internet is placing higher bandwidth demands on the entire network .

目前，宽带网络的接入方式有：以太网（光纤双绞线交换机）、ADSL、CABLEModem（HFC）、宽带无线等。

At present , there are different modes of broadband access : Ethernet , ADSL , Cable Modem ( HFC ) and wireless broadband .

将2个RS232/CAN智能转换器通过双绞线连接起来，实现2个设备之间的RS232点对点远程通信。

Linking 2 RS232 / CAN converters of the RS232 devices by twisted wire can implement point to point long-distance communication .

超高速数字用户环路（VDSL）是利用无屏蔽铜芯双绞线传输高速数字信号的新技术。

VDSL is a new technology which transmits high-speed digital via unshielded twisted pair wire .

传统的有线接入网是基于DSL技术的铜缆双绞线网络，其提供的带宽能力非常有限。

Traditional wire line access network is based on DSL technology twisted-pair copper network . It can only provide very limit network bandwidth .

交叉功能大多在MAU内或双绞线链路中其他处实现。

Crossover functions may be implemented internally to a MAU or elsewhere in the twisted-pair link .

通信介质采用RS485屏蔽双绞线，可有效地减少电缆的数量，提高了系统的自动化水平及运行的可靠性。

It will reduce the quantity of lines and enhance the reliability by adopting RS 485 shielding twisted-pair line .

双绞线缆线的二类型是遮蔽双绞线（STP）和无遮蔽双绞线（UTP）。

Two types of twisted-pair cable are shielded twisted-pair ( STP ) and unshielded twisted pair ( UTP ) .

为此在馈线自动化系统中选择有线（双绞线）通信方式，采用OFDM技术实现数据传送，并用数字信号处理器（DSP）实现数据的调制与解调。

Therefore , wire ( twister-pair ) communication manner is chosen in the feeder automation system . The proposed system uses OFDM technology to transfer data , and adopts DSP to modulate and demodulate the data .

馈线主干线FTU和馈线支路上的FTU、TTU通信采用屏蔽双绞线的专线通信方式；

And the shield double line is used between FTU or TTU on main feeder branch and sub branch .

主站和从站采用ProFiBus-DP协议，通过屏蔽双绞线完成通信。

The communicating protocol between the network master station and the network associate station is ProFiBus-DP standard protocol , the communication is implemented through the twisted-pair .

实践表明：在现行条件下，基于普通铜质双绞线的xDSL技术群是远程监控更为现实、可行的传输方式。

XDSL technology group based on twisted pair lines is a transmission technology of higher feasibility in long-range supervision system .

主、从机之间传输介质为双绞线，按RS-485串行总线标准及接口技术实现信息交换。

The transfer medium between the host and slave processors is twisted-pair wire , and the information exchange is accomplished according to the RS-485 serial bus standard and the interface technology .

采用混合方法，即传输线链参方法、有限元方法和亚网格FDTD方法相结合，对切缝屏蔽双绞线的电磁泄漏进行了模拟分析。

By applying the hybrid-method , which is the combination of the chain-parameter-equation , the finite-element-method and the subcell-FDTD-method , the electromagnetic leakage from the transverse slot on the shield of the twist-pair are simulated .

TCN传输介质-双绞线采用四个性能指标进行评价：衰减、近端串扰、阻抗特性和时延。

Aiming at evaluating the performance of the transmission media-twisted pairs used for TCN network , including attenuation , near-end crosstalk , impedance and delay .

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 .

在系统主干线通道上采用光纤通信方式，对于分支通信采用屏蔽双绞线以RS-485方式通信，并对网络体系结构作了详细的描述。

Optical fiber communication mode is adopted in main channels , RS-485 communication mode using shielding twisted pair lines is employed in branch channels , and detailed description of network architectures is described .

试验结果表明，以光纤替代屏蔽双绞线作为传输介质的1773光纤数据总线能够使1553B总线系统具有更强的性能和更高的可靠性。

The experimental results show that the 1773 data bus with fiber-optic as the transmission media instead of twisted shielded pair cable could provide higher performance and reliability .

但由于双绞线的非理想特性，信号在传输过程中会出现直流衰减、高频衰减和基带漂移等问题，造成严重的码间干扰（ISI）。

Due to the nonideal characters of this medium , the data signals will suffer from the DC gain attenuation , high frequency attenuation and Baseline Wander , which induces the inter-symbol interference ( ISI ) .

实现宽带交互接入网有各种不同的解决方案，如建立光纤网，用双绞线对的ADSL对现有铜线网络进行升级，或在有线电视网中采用光纤同轴混合电缆。

Different alternative solutions have been presented to realize a broadband interactive access network , such as installing optical fiber or upgrading the existing copper network with ADSL for twisted pair or hybrid fiber coax for CATV networks .

一线制（1-wire）技术是Dallas公司推出的一种新技术，可通过普通双绞线传输双向数据，且能够为总线上的1-wire器件提供电能。

1-wire technique , a new technique of Dallas , can transmit both power and bidirectional data in a single twisted-wire cable , and is used in low-speed control system or the systems of multi-objects controlled .

本文首先对铜双绞线的传输特性、噪声特性、ADSL系统的技术特性、结构特点给以介绍，并详细介绍了DMT调制技术的理论知识。

Firstly , the transmission characteristic and noise characteristic of copper wire , the technology and architecture characteristic of ADSL system are discussed in this paper . And it introduces the theory knowledge of the Multi-Tone modulation technology detailedly .

非对称数字用户线（ADSL）技术以充分利用现有双绞线资源的潜力为出发点，在不影响电话业务的同时，提供高速、非对称的数据接入。

Asymmetric Digital Subscriber Loop ( ADSL ) is the technology that provides high-speed , asymmetric data access , synchronously the potential of Twisted Pair ( TP ) is utilized , and the Plain Old Telephone Service ( POTS ) is not interrupted .