电信专业英英词典D-4

　　D type Channel Bank

　　A D type channel bank is channel termination equipment used for combining (multiplexing) individual analog¹ channel signals on a time division basis. D type channel banks provide interfaces³ for "n" analog signal inputs⁵. Each analog input⁴ signal is directed to a codec for en coding to PCM samples. A part of a Tl carrier system.

　　DACS

　　digital access & cross-connect system

　　DARPA

　　Defense⁶ Advanced Research Projects Agency

　　Data Compression

　　Data compression is a technique that removes redundancy in transmitted bit patterns to reduce transmission rates by 20% to 200%. For example, a modem⁷ designed to send and receive data at 1200 bps without data compression may be capable of supporting 2400 bps with data compression, using the same network analog voice-grade channel.

　　Data Service Units (DSU)

　　DSUs are channel service units (CSI's) and data service units (DSUs) are required to connect digital customer premises⁸ equipment (CPE ) to carrier networks. A hardware device providing an interface² between a digital line and a unit of data terminal equipment. DSUs provide transmit and receive control logic⁹, synchronization¹⁰ and timing¹¹ recovery across data circuits. DSUs may also convert ordinary binary¹² signals generated by CPE to special bipolar signals. Bipolar signals are designed specifically to facilitate transmission at up to 1.544 Mbps rates over UTP cable, a media originally intended for 3 kHz, voice bandwidth signals. See Channel Service Units (CSU).

　　Data Terminal Equipment (DTE)

　　DTE is any device that can send data, receive data or perform both functions. (Note: sometimes DTE implies digital terminal equipment, a type of CPE used with digital Service——see CSU and DSU.)

　　DB Loss

　　Decibel¹³ (dB) is a unit of measure of signal strength, usually the relationship between a transmitted signal and a standard signal source. Loss is measured when the signal received across a communication circuit is less than what was transmitted by the signal generator¹⁴.

1 analog   

n.类似物，模拟

参考例句：

• The analog signal contains high-frequency video information,which helps make up the picture.模拟信号包括有助于构成图像的高频视频信息。
• The analog computer measures continuously,without proceeding step by step.模拟计算机不是一步一步地进行，而是连续地进行量度。

2 interface   

n.接合部位，分界面；v.(使)互相联系

参考例句：

• My computer has a network interface,which allows me to get to other computers.我的计算机有网络接口可以与其它计算机连在一起。
• This program has perspicuous interface and extensive application. 该程序界面明了，适用范围广。

3 interfaces   

界面( interface的名词复数 )； 接口（连接两装置的电路，可使数据从一种代码转换成另一种代码）； 交界； 联系

参考例句：

• If the class needs to be reprogrammed, new interfaces are created. 如果class需要重新程序设计，新的interfaces创建。
• Interfaces solve this problem of evolving code. Interfaces解决了代码升级的问题。

4 input   

n.输入(物)；投入；vt.把(数据等)输入计算机

参考例句：

• I will forever be grateful for his considerable input.我将永远感激他的大量投入。
• All this information had to be input onto the computer.所有这些信息都必须输入计算机。

5 inputs   

n.输入( input的名词复数 )；投入；输入端；输入的数据v.把…输入电脑( input的第三人称单数 )

参考例句：

• Uncheck the inputs checked for optimization in the previous stage. 不测试那些已经测试过的优化了的以前步骤的inputs.（变量参数）。 来自互联网
• Just in case, save in a file the inputs obtained at the previous stage. 以防万一，保存以前步骤获得的inputs（变量参数值）到一个文件中去。 来自互联网

6 defense   

n.防御，保卫；[pl.]防务工事；辩护，答辩

参考例句：

• The accused has the right to defense.被告人有权获得辩护。
• The war has impacted the area with military and defense workers.战争使那个地区挤满了军队和防御工程人员。

7 modem   

n.调制解调器

参考例句：

• Does your computer have a modem?你的电脑有调制解调器吗？
• Provides a connection to your computer via a modem.通过调制解调器连接到计算机上。

8 premises   

n.建筑物，房屋

参考例句：

• According to the rules,no alcohol can be consumed on the premises.按照规定，场内不准饮酒。
• All repairs are done on the premises and not put out.全部修缮都在家里进行，不用送到外面去做。

9 logic   

n.逻辑(学)；逻辑性

参考例句：

• What sort of logic is that?这是什么逻辑？
• I don't follow the logic of your argument.我不明白你的论点逻辑性何在。

10 synchronization   

n.同一时刻；同步；使时间互相一致；同时性

参考例句：

• Communication record: the function supports synchronization record during the communication process. 通话录音：支持通话过程的同步录音。 来自互联网
• Synchronization is an important problem of digital audio watermarking. 同步性是数字音频水印的一个重要问题。 来自互联网

11 timing   

n.时间安排，时间选择

参考例句：

• The timing of the meeting is not convenient.会议的时间安排不合适。
• The timing of our statement is very opportune.我们发表声明选择的时机很恰当。

12 binary   

adj.二，双；二进制的；n.双(体)；联星

参考例句：

• Computers operate using binary numbers.计算机运行运用二进位制。
• Let us try converting the number itself to binary.我们试一试，把这个数本身变成二进制数。

13 decibel   

n.分贝(音量的单位)

参考例句：

• The noise pollution reached a high decibel level.噪音污染达到了很高分贝。
• In sound we use the decibel scale.在声学中我们采用分贝标度。

14 generator   

n.发电机，发生器

参考例句：

• All the while the giant generator poured out its power.巨大的发电机一刻不停地发出电力。
• This is an alternating current generator.这是一台交流发电机。