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Question 1
(a) Describe the functions of the modulator and source encoder in a digital communications system.
(b) By using appropriate examples, distinguish between the simplex and half duplex mode of communication.
(c) Briefly illustrate what is meant by the physical topology of a network. Given that there are n devices in a network, what is the number of cable links required for the following topologies:
(i) Mesh (ii) Ring (iii) Bus (iv) Star
(d) Identify which layer of the OSI model each of the five functions below is most likely to belong to. It is also possible that one or more of the functions cannot be mapped to an OSI layer. If this is the case, explain why.
(i) Translating between EBCDIC to ASCII (ii) Defining the pin-outs in a connector used to attach to a network cable (iii) Generating error correction codes for packet error correction (iv) Arbitrating between multiple nodes attached to a single medium (v) Providing an interface to a visual packet monitoring program
(e) Why is digital transmission better than analog transmission over a long distance where repeaters are needed in any case? Give two advantages of digital transmission over analogue transmission.
Flow of electrons - Electrons flow down a wire that is what current, is. Good conductors like copper and silver and aluminum have free electrons in their outer shells, and they jum
Active-mode NPN transistors in circuits Figure: Structure and use of NPN transistor. Arrow according to schematic. The figure opposite is a schematic presentation
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Forth Generation VLSI technology of IC made it possible to design the complete circuit of ALU Arithmetic logic unit and cu ( Control Unit ) within single chip which
project to write a program to simulate a dc motor on a matlab
Q. What will be the effects of an increase in real national income on the interest rate? Answer: An enhance in real national income will increase the interest rate. If
Q. Two three-phase generators are supplying to a common balanced three-phase load of 30 kW at 0.8 power factor lagging. The per-phase impedance of the lines connecting the generato
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1) Study the CPLD Design Project Brief to gain an understanding of the project, and the System Specification, Circuit Description, Pre-processing and Post-processing Requirements f
i want to know the all the three jfet in present and future use and desing for each component
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