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

Calculate the speed of motor when armature current is 25 a, Q. The magnetiz...

Q. The magnetization curve taken at 1000 r/min on a 200-V dc series motor has the following data: Field current, A: 5 10 15 20 25 30 Voltage, A: 80 160 202 222 236 244 Th

System of forces.., Example of unlike coplaner parallel force''

Example of unlike coplaner parallel force''

Explain power-system loads, Q. Explain Power-System Loads? Figure repre...

Q. Explain Power-System Loads? Figure represents a one-line (single-line) diagram of a part of a typical three-phase power system. Notice the symbols that are used for generato

Minimize f in a pos form and obtain a possible realization, Q. The truth ta...

Q. The truth table for F(A,B,C) = Mi (0, 1, 6, 7) is as follows: (a) Express F in a canonical product-of-sums form. (b) Minimize F in a POS form and obtain a possible re

Electrons and holes, E l e c t r ons and Holes For T> 0 K, t...

E l e c t r ons and Holes For T> 0 K, there would be some electrons in the otherwise empty conduction band, and some empty states in the otherwise filled valence ban

Traffic light display, Traffic Light Display Design a three color LED sy...

Traffic Light Display Design a three color LED system with the following times for each LED: Duration of Green signal : 16s Duration of Yellow signal : 1s Duration of R

Obtain expressions for the open-loop voltage gain, Q. Consider the op-amp c...

Q. Consider the op-amp circuit shown in Figure and obtain expressions for the open-loop voltage gain at (a) low and (b) high frequencies. Also determine relations for the 3-dB poin

Scientists, biography of scientists in different branches

biography of scientists in different branches

Triac, what is the daily life work of triac

what is the daily life work of triac

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