hertz; the digital bandwidth‚ in bits per second. Figure1.2 Bandwidth Signals: Analog or digital Signals can be analog or digital. Analog signals can have an infinite number of values in a range; digital signals can have only a limited number of values. Analog signal has infinitely many levels of intensity (infinitely many values‚ continuous values) over a period of time. Digital signal has only a limited number of defined values (discrete values) say‚ 0‚1. Figure 1.3 Analog and Digital Signal
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Repeater: operates at physical layers of osi model. Digital signals or analog signals that carry digital data can only be transmitted over a limited distance. After a certain distance attenuation or noise endangers the integrity of that data. Repeaters reproduce and transmit the received digital data. This new signal is the exact duplicate of the original signals. Repeaters offer simple means to extend a network‚ increased traffic on the network is introduced. This increased network congestion may
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ADC0803‚ ADC0804 ® Data Sheet August 2002 8-Bit‚ Microprocessor-Compatible‚ A/D Converters FN3094.4 Features The ADC080X family are CMOS 8-Bit‚ successiveapproximation A/D converters which use a modified potentiometric ladder and are designed to operate with the 8080A control bus via three-state outputs. These converters appear to the processor as memory locations or I/O ports‚ and hence no interfacing logic is required. The differential analog voltage input has good commonmode-rejection
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Before I say anything‚ I’d like to do a little survey. How many of you have an ipad or an e-reader? Do you prefer reading on the ipad or reading a paper book? A couple of weeks ago I read an article on the New York Times website‚ it is called “Long Live Paper” written by Justin B. Hollander. The argumentation of the author was aroused by the US Education Secretary Arne Duncan’s declaration of "Over the next few years‚ textbooks should be obsolete." but According to the author; good old paper
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used in a corporate environment? I like to think of a CSU/DSU(Channel service and Data service unit) as something similar to a modem. In general Dial-up or DSL service a modem is required to convert digital signals to analog and vice versa. A CSU/DSU acts in the same way. The CSU/DSU converts the digital data frames that local area networks (LAN) uses into a frame a wide-area network (WAN) uses and just like the modem it will change the frames back to go the other direction across the network. Within
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Diggital Nation Digital Nation/ Growing up online 1 Malcolm Robinson College Of Staten Island Professor Kovacs Com 100 Nation/Online
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cellular (wireless) network‚ to receive or transmit data over the fixed line a modem is needed on each end of the line. The modem/ router take the digital information and turn it into segments that have been specifically selected for the transmission over the telephone network. The modem on the other end is responsible for turning the segments back into the digital data. Up until the DSL was created‚ the modem’s job was to transmit data over a telephone network that is designed for voice so the data rates
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President‚ Fr. Carlo Magno Ilagan last July 2013. Also‚ the school has secured classrooms with LCD projectors to further aid in efficiency and effective learning process of the students. With the advantages that entail the new leap in the introduction of digital education‚ we took on the risks. But are the risks worth taking compared to the advantages the traditional education system offers? Throughout the years‚ books and other written materials have been man’s “immobile” transportation to the information
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2009 3rd International Conference on Power Electronics Systems and Applications PLC and Configuration Software Based Supervisory and Control System for Oil Tanks Area Xi CHEN1 Yanbo CHE1 K.W.E CHENG2 1 School of Electrical Engineering & Automation‚ Tianjin University‚ Tianjin China. E-mail: ybche@tju.edu.cn 2 Department of Electrical Engineering‚ The Hong Kong Polytechnic University‚ Hong Kong‚ E-mail: eeecheng@polyu.edu.hk Abstract - A supervisory and control system for oil tanks
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innovative methods and technologies to capture‚ distribute‚ manage and analyze larger-sized data sets with high rate and diverse structures that conventional data management methods are unable to handle. Digital data is now everywhere—in every sector public or private‚ economy‚ organization and customer of digital technology. There are many ways that big data can be used to create value across sectors of the global economy. It has demonstrated the capacity to improve predictions‚ save money‚ gain efficiency
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