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

Personal safety from power, Personal  safety Power supplies can be very...

Personal  safety Power supplies can be very dangerous. This is specifically true of high voltage circuits, but anything over 12 V must be treated as lethal potentially. A po

Compute the percentage change, Q. A particular BJT has a nominal value of α...

Q. A particular BJT has a nominal value of α 0.99. Calculate the nominal β.If α can easily change ±1%, compute the percentage changes that can occur in β.

Explain input characteristic of common emitter configuration, Q. Explain Th...

Q. Explain The Input Characteristics Of Common Emitter Configuration? Input characteristics:In the figure the abscissa is the base current IB, The ordinate is the base to emitter

Example numerical of dc generator., Q. An 8 - pole dc generator has 500 arm...

Q. An 8 - pole dc generator has 500 armature conductors and has a useful flux per pole of 0.065 web. What will be the emf generated if it is lap connected and runs at 1000 r.p.m.

Explain working of digital-to-analog converters, Q. Explain working of Digi...

Q. Explain working of Digital-to-Analog Converters? Digital-to-Analog (D/A) Converters For the results of digital computations to be used in the analog world, it becomes n

Microprocessor development system, Write explanatory notes on  Microprocess...

Write explanatory notes on  Microprocessor development system. Microprocessor development system : Computer systems have undergone several changes recently. Machines which

Three phase ac circuit, Three Phase AC Circuit: Alternating circuits t...

Three Phase AC Circuit: Alternating circuits thus far discussed have single phase supply system and it's satisfactory for domestic application as light, fan and heating, etc.

Microcontroller, Project Garage door opener with password. Wrong password ...

Project Garage door opener with password. Wrong password "door close" on lcd screen, correct password "door open" on lcd Screen no need the motor. Material used - Microcontroller

Power, why do we use commutator?

why do we use commutator?

Working with various instructions using debug, The purpose of this experime...

The purpose of this experiment is to introduce you to a powerful 80x86 assembly/machine language utility called DEBUG. Preparing Your DEBUG Environment If you have an older

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