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A change from one significant condition to another in a telegraph or a data signal. 在电报或数据信号中，从一个有效状态到另一个有效状态的一种变化。
Modulate: To mix a voice or data signal onto a carrier for transmission in a communications network. 调制:把声音或数据信号混入承载体内，以便在通信网络内传送的情况。
Ethernet relies on baseband signaling, which uses the entire bandwidth of the transmission medium. The data signal is transmitted directly over the transmission medium. 乙太网路依据基频讯号，它使用传输媒体的全部频宽，资料讯号是直接在传输媒体上传输。
A digital data network (DDN) is a data transmission network within which digital channels are utilized for data signal transmission. 数字数据网(DDN)是采用数字信道来传输数据信号的数据传输网。
When the temperate has changed greatly .The system will also transmit one reversal data signal in order to control the vidicon on site . 同时为了实现对现场摄像机的控制，还需回传一路数据信号。
All modulus switch (ADC) and the d/a converter (DAC) all needs a datum signal, usually is the voltage datum. 所有模数转换器(ADC)和数模转换器(DAC)都需要一个基准信号，通常为电压基准。
Today, signaling systems transport not only voice, but also video and data signals throughout both analog and digital networks. 现今，信令系统传输的不仅仅是语音，而且还包括视频以及整个模拟和数字网络中的数据信令。
PCM modem is the highest speed modem on the PSTN network,which offers 56 kbit/s data signaling speeds in the direction of ISP(Internet Service Provider)to client,which also is the hot subject of ITU TSS SG16.Now its related content is introduced. PCMModem是迄今为止在PSTN网上出现的最高速的Modem，它在ISP（InternetServiceProvider）到用户方向上实现了56kbit/s的数据传输速率，本文介绍了有关的技术概况。
In WLANs, a third type of modulation called phase modulation is used to superimpose the data signal onto the carrier signal that is broadcast by the transmitter. 在WLAN中，第三种调变称为相位调变，使用来附加资料讯号到传送器广播出的载波讯号。
Today,signaling systems transport not only voice,but also video and data signals throughout both analog and digital networks. 现今，信令系统传输的不仅仅是语音，而且还包括视频以及整个模拟和数字网络中的数据信令。
In data communications, a mode in which data is transmitted at a specific data signalling rate during controlled, intermittent intervals. 在数据通信中,在受控制的时间间隔内,按特定数据信号发送速率发送数据的一种方式。
Modulate: To mix a voice or data signal onto a carrier for transmission in a communications network. Data is modulated onto the carrier by various methods, such as amplitude modulation (AM), frequency modulatikon (FM), etc. 调制:把声音或数据信号混入承载体内，以便在通信网络内传送的情况。数据调制，有各种方法，例如振幅调制（调幅）和频率调制（调频）。
Which devices are primarily used to extend cable segments within a collision domain by regenerating the data signals? 哪些装置主要地用来在一个碰撞领域里面藉由再产生数据信号扩充电缆片段?
Decoder A device used to unscramble data signals and display them on a video screen. 解读数据信号并把它列出于显示器的荧光屏上的装置。
Decoder: A device used to unscramble data signals and display them on a video screen . 译码器:解读数据信号并把它列出于显示器的荧光屏上的装置。
Terminator A resistie load placed at the end of a cable to preent data signals from reflecting back into the data path. 终结器终结器就是置于电缆终端的一个电阻负荷，用来防止数据信号又反射回到线路中去。
On copper cable, data signals are represented by voltage levels that represent binary ones and zeros. 在铜质缆线，资料讯号以二进位壹和零的电压位准表示。
Direct memory access(DMA)is an important technology used for fast speed data transfer in data signal processor(DSP). DMA is able to move data block independent of CPU, and this capability meets real time image processing. 直接内存存取(DMA)是数字信号处理器(DSP)中用于快速数据交换的重要技术,它具有独立于CPU的后台批量数据传输能力,能够满足实时图像处理中高速数据传输要求。
A receiver demodulates the carrier signal that arrives from its antenna. The receiver interprets the phase changes of the carrier signal and reconstructs from it the original electrical data signal. 接收器解调变到达它的天线的载波讯号。接收器解释载波讯号的相位变化和从它原来的电资料讯号重建。
A buffer in a drum used to temporarily store data. 磁鼓中用来暂时存放数据的一种缓冲区。