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CS447HW2 - Computer Networks and Data Communications 2006...

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Computer Networks and Data Communications CS642/CS447, Fall 2006 Assignment 2 1- Discuss the differences between Analog and Digital Signals. List the parameters used to represent and describe each of them. - Analog Signals: Analog signals are the original and the natural expression of information. Analog signals are defined by their properties: Frequency(f), Period Time (t), Wavelength( λ ). - Digital Signals: An electronic signal transmitted as binary code that can be either the presence(1) or absence(2) of current, high and low voltages or short pulses at a particular frequency. Source: http://www.pcmag.com/encyclopedia_term/0,2542,t=digital+signal&i=41382,00.asp 2- What type(s) of wireless communication system require direct line of sight between transmitter and receiver? Explain this approach . - Microwave Transmission: A point-to-point transmission approach which uses microwaves traveling from node to node for data transmission. It is usually carried by two microwave dishes which are aligned with each other. *Source: www.about-wireless.com/terms/microwave.htm
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- Infrared: A short-wave transmission technology that is relatively cheap, but cannot pass through solid objects. It used indoors in many homes and in companies for transmission and security purposes. *Source: http://www.plasma.com/remotes 3- Define and Evaluate a value for each of the communication parameters below: The frequency of a signal that completes one cycle in 0.05 second.
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