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 the signals hold and sid, Explain the signals HOLD, READY and SID ...

Explain the signals HOLD, READY and SID HOLD indicates that a peripheral such as DMA controller is requesting the use of address bus, data bus and control bus. READY is used to

Induction motor, A 100hp,460v,8pole,60hz,star connected 3phase IM runs at 8...

A 100hp,460v,8pole,60hz,star connected 3phase IM runs at 891rpm under full load what is the speed of the rotor field relative to i)rotor structure ii)stator rotating field

What is the use of latch signal on the ad0-ad15 bus, What is the  use of l...

What is the  use of latch signal on the AD0-AD15 bus in an 8086 system? Latch signal is used to load the data those are fetched from memory to bus.

Increase in ht and lt ratio, Increase in HT and LT Ratio It is well kn...

Increase in HT and LT Ratio It is well known that for high HT/LT ratio, the losses will be low. The losses for a given quantum of power supplied through a line are inversely p

Operation of a transistorized phase shift oscillator, Q. Discuss the operat...

Q. Discuss the operation of a transistorized phase shift oscillator with the help of a diagram? Explain the phase shifting circuit? An oscillator is a circuit which converts elec

Overcoming power shortages, Overcoming power shortages: NEP aims at me...

Overcoming power shortages: NEP aims at meeting both energy and peak demand fully through 2012 along within creating 5 percent spinning reserves at national level. The policy

For sign flag - return instructions, For sign flag  RP ( Return on ...

For sign flag  RP ( Return on Plus ) and RM ( Return on no minus ) Instructions RM returns from the subroutine  to the calling program if sign flag is set  (S=1). The in

Characteristics of transformer, Q. Characteristics of Transformer? The ...

Q. Characteristics of Transformer? The characteristics of most interest to power engineers are voltage regulation and ef?ciency. The voltage regulation of a transformer is a me

Conductors for lines, Conductors for Lines The sizing of conductor mus...

Conductors for Lines The sizing of conductor must depend upon the load it is expected to serve and other factors, such as capacity required in future. Or else conductors/cable

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