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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.
If a compressor in a system can change a message crest factor from 3.2 to 2, while maintaining its peak amplitude constant, find the decibels of improvement in signal-to-noise rati
What is faithful amplification. What are basic condition for faithful amplification. Describe : (a) Peak Inverse voltage. (b) Maximum forward current. (c) Knee voltage
What is RXD? RXD- Receive Data Input This input pin of 8251A gets a composite stream of the data to be received by 8251A.
What is use of co-processor in a typical microprocessor based system. This is a processor that works in parallel with the major processor. This has its own set of specialized i
Figure shows the block diagram of an aircraft pitch stabilization system which uses position, velocity and acceleration feedback. i) Show that for a unit step input the steady s
Define Spectrum of Real Signals? In the real world, we rarely come throughout a pure sine wave. Typical signals have a wide spectrum as displayed in the above diagram. Informat
Q. Commercial FM radio broadcasting? Commercial FM radio broadcasting utilizes the frequency band of 88 to 108 MHz for the transmission ofmusic and voice signals. The carrier
The five addressing modes are given below: Immediate, Register, Direct, Implied addressing modes Register indirect,
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