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

Power angle and performance characteristics, Q. Power Angle and Performance...

Q. Power Angle and Performance Characteristics? The real and reactive power delivered by a synchronous generator, or received by a synchronous motor, can be expressed in terms

Bode plot, Hai.. i have been given a open loop transfer function to draw a...

Hai.. i have been given a open loop transfer function to draw a bode plot with a particular K value and they asked me to find the value of K for which the phase margin becomes 45d

Explain about frequency shift keying, Q. Explain about Frequency Shift Keyi...

Q. Explain about Frequency Shift Keying? In this scheme frequency of the carrier signal is changed according to the data. Transmitter sends different frequencies for a "I" than

Explain virtual memory, Explain virtual memory. The term virtual memor...

Explain virtual memory. The term virtual memory considers as to something that appears to be present but in fact it is not. The virtual memory technique permits users to use m

Interrupt structure of the 8085 microprocessor, List the four instructions ...

List the four instructions which control the interrupt structure of the 8085 microprocessor. DI ( Disable Interrupts ) EI ( Enable Interrupts ) RIM ( Read Interrupt Masks

Compute the starting torque with the starting compen sator, A three-phase, ...

A three-phase, 2200-V, 60-Hz, delta-connected, squirrel-cage induction motor, when started at full rated voltage, takes a starting current of 693 A from the line and develops a sta

Personal and corporate income tax rate, Ginny Jones currently works as the ...

Ginny Jones currently works as the VP-Product Strategy for a well-established enterprise software company. She and her friend, Tom Robinson, currently CFO at a competing firm (and

Power, why do we use commutator?

why do we use commutator?

DC Generator, What is Commutator? Explain in brief about the Commutator act...

What is Commutator? Explain in brief about the Commutator action in dc generator.

How does voice one dsl work?, Question 1 Define the term telecommunication...

Question 1 Define the term telecommunication? Discuss briefly the various uses of telecommunication in daily life Question 2 Explain the powers and functions of the TRAI

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