Digital communications system, Electrical Engineering

Assignment Help:

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.


Related Discussions:- Digital communications system

Explain soft magnetic materials, Explain Soft magnetic materials. So...

Explain Soft magnetic materials. Soft magnetic materials -They contain small enclosed area of hysteresis loop, high permeability low eddy current losses and high saturation

Need of microphone in telephone hand set, Q. Need of Microphone in telephon...

Q. Need of Microphone in telephone hand set? Microphone: For all practical purposes, microphone is transmitter for telephone. The microphone converts acoustical signals in the

Impedance heating system, Under what circumstances is individual circuit pr...

Under what circumstances is individual circuit protection for a lighting and applications panel board not required? What is the purpose of guarding runway contact conductors and

Determine the power rating of compressor motor, An ice plant produces 12ton...

An ice plant produces 12tonn of ice per day at 0 0 C using water at 300C. The plant operates on reversed Carnot cycle between -15 0 C and 28 0 C. If the actual C.O.P. is 50% of the

Karnaugh map, how can be a karnaugh map of the count of sequence: 0-5-6-9-1...

how can be a karnaugh map of the count of sequence: 0-5-6-9-11-14

Estimate conversion time of counter-controlled a/d converter, Q. An 8-bit A...

Q. An 8-bit A/D converter is driven by a 1-MHz clock. Estimate the maximum conversion time if: (a) It is a counter-controlled A/D converter. (b) It is a successive-approximat

Bidirectional shift register, Design 2-bit bidirectional shift register? ...

Design 2-bit bidirectional shift register? ## A list of ten 8-bit numbers is located at address $5000. Write a 68000 Assembly program (flowchart and code) to sort those numbe

Required conditions for connecting two transformers, Q. Required Conditions...

Q. Required Conditions for connecting two transformers in parallel? Ans: a) Voltage rating should be same b) Per unit impedance should be same c) Phase sequence should

Signals and systems, Assignment 2: FIR Filters in Audio Processing This as...

Assignment 2: FIR Filters in Audio Processing This assignment will focus on the filtering of audio signals using FIR filters. Audio signal processing uses many types of digital f

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd