All Questions
Question

Using Shannon's formula, estimate the channel capacity of a voice grade telephone line having S/N ratio of 3018 and bandwidth 3400Hz

Subject Data Communication
NU Year 2008
Question

Name the common guided transmission media and give the physical description. Application areas and transmission characteristics of any one of them.

Subject Data Communication
NU Year 2008
Question

Write down the advantages of packet switching over circuit switching.


Subject Data Communication
NU Year 2008
Question

Distinguish between data gram and virtual circuit with diagram.

Subject Data Communication
NU Year 2008
Question

Write short notes on any two of the following:-

(i) Microwave transmission.

(ii) Time Division switch.

(iii) Cellular system.

(iv) Amplitude Modulation (AM).

Subject Data Communication
NU Year 2008
Question

 What are three popular ARQ mechanisms for error control in data communication?


Subject Data Communication
NU Year 2008
Question

How does ARQ correct an error?

Subject Data Communication
NU Year 2008
Question

How does Go-Bank-N ARQ differ from Selective Repeat ARQ?

Subject Data Communication
NU Year 2008
Question

Write down the types of HDLC frames and give a brief description of each.

Subject Data Communication
NU Year 2008
Question

 Write down about basic characteristics of HDLC protocol. Briefly explain it: frame format.


Subject Data Communication
NU Year 2008
Question

With figure explain FDM. Distinguish between Synchronous and Statistical TDM

Subject Data Communication
NU Year 2008
Question

Explain CRC technique for error detection

Subject Data Communication
NU Year 2008 2015
Question

Describe with diagram the advantages of multistage space division switch with diagram

Subject Data Communication
NU Year 2008
Question

 Why is FM superior to AM?

Subject Data Communication
NU Year 2008
Question

Compare the FM bandwidth with the AM bandwidth

Subject Data Communication
NU Year 2008
Question

What are the advantages QAM over ASK and PSK?

Subject Data Communication
NU Year 2008
Question

Given a bandwidth of 5000 Hz for an 8-PSK signal. Calculate the band rate.

Subject Data Communication
NU Year 2008
Question

what is the fundamental purpose of data communication

Subject Data Communication
Question
Describe the simplified Data Communication Model with block diagram
Subject Data Communication
NU Year 2010
Question
Define Guided and Unguided Media
Subject Data Communication
NU Year 2010
Question

What are the activities of each layer in the OSI layers

Subject Data Communication
NU Year 2010
Question

Explain the basic principles of ASK and FSK (Data transition in digital to analog conversation)

Subject Data Communication
NU Year 2010
Question

What is constilation diagram? Show the constellation diagram of QPSK

Subject Data Communication
Question

What is constellation diagram? Show the constellation diagram of QPSK

Subject Data Communication
NU Year 2010
Question

What do you mean by line coding and block coring? Encode the bit stream 10110101 by Manchester and differential Manchester encoding techniques

Subject Data Communication
NU Year 2010
Question

What are bit rate and baud rate? A signal is carrying four bits in each signal element ll 1000 signal elements are sent per second, find the bit rate and baud rate.

Subject Data Communication
NU Year 2010
Question

What is multiplexing? Exploit how FDM combines multiple signals into one / FDM is an analog multiplexing technique that combines analog signals.

Subject Data Communication
NU Year 2010
Question

Discuss synchronous TDM with diagram. Distinguish between Multilevel TDM and Multiple slots TDM.

Subject Data Communication
NU Year 2010
Question

With a neat diagram explains the interleaving technique.

Subject Data Communication
NU Year 2010
Question

Describe the " Setup Request " phase of a Virtual circuit Network (VCN)

Subject Data Communication
NU Year 2010
Question

Construct the Hamming code for the bit sequence 10011101


Subject Data Communication
NU Year 2010
Question

Assuming even parity. Find the parity bit for each of the following data units: (i) 1001011 (ii)1110111


Subject Data Communication
NU Year 2010
Question

what is a crossbar switch? What is the major limitation ? Explain how a multistage switch overcomes the limitations of the crossbar switch.

Subject Data Communication
NU Year 2010
Question

Given a remainder of 111, a data unit of 101 10011 and a divisor of 1001, find whether there is an error or not the data unit

Subject Data Communication
NU Year 2010
Question

Explain satellite transmission with VSAT configuration.

Subject Data Communication
NU Year 2010
Question

what are the important applications of satellite?

Subject Data Communication
NU Year 2010
Question

What is the base of pulse code modulation? Why delta modulation is used?

Subject Data Communication
NU Year 2010
Question

Data exchanges over a transmission line can be classified a: full duplex or half duplex. Compare this two way of transmission.

Subject Data Communication
NU Year 2010
Question

What is flow control ? Describe the process of stop and wait control with necessary diagram.

Subject Data Communication
NU Year 2010
Question

Explain the operation of stop and wait ARQ error control method in case of lost and damaged frames.

Subject Data Communication
NU Year 2010
Question

what is a sliding window? What is the purpose of it? A sliding window protocol uses a window of side 15. How many bits are needed to define the sequence number?

Subject Data Communication
NU Year 2010
Question

what is ISDN? Discuss different types of channels  used in ISDN.

Subject Data Communication
NU Year 2010
Question

Define Data Communication. Briefly explain the simplified model of data communication

Subject Data Communication
NU Year 2012 2013 2014
Question

What are the differences between half-duplex and full-duplex transmission modes?

Subject Data Communication
NU Year 2012
Question

Explain the functions of transport layer and network layer of OSI reference model

Subject Data Communication
NU Year 2012
Question

What is the difference between a port address, logical address and a physical address?

Subject Data Communication
NU Year 2012 2014
Question

What is transmission impairments? Explain the types of transmission impairments.


Subject Data Communication
NU Year 2012 2015 2014
Question

What do you mean by Nyquist bandwidth and Shannon capacity rate?

Subject Data Communication
NU Year 2012
Question

What are the bit rate and band rate? A signal ls carrying four bits in each signal element. if 1000 signal elements are sent per second. find the bit rate and band rate. 

Subject Data Communication
NU Year 2012
Question

sketch the signal waveforms of NRZ-L NRZ-1 and Manchester encoding scheme for 10110011

Subject Data Communication
NU Year 2012
Question

What is multiplexing? Explain synchronous time division

Subject Data Communication
NU Year 2012
Question

Which of the three multiplexing technique  are common for fiber optic link? Explain the reason

Subject Data Communication
NU Year 2012 2013
Question

Two channels, one with a bit rate of 150kbs and another with a bit rate of 140kbs are to the multiplexed using pulse stuffing TDM with no synchronous bits. Answer the following question?

a. What is the size of a frame in bits?

b. What is the frame rate?

c. What ls the duration of a frame?

d. What is the data rate?


Subject Data Communication
NU Year 2012
Question

What is VSAT?Discuss VSAT communication system with configuration?

Subject Data Communication
Question

What is VSAT ? Discuss VSAT communication system with configuration?

Subject Data Communication
NU Year 2012
Question

Describe ASK FSK and PSK with figure

Subject Data Communication
NU Year 2012
Question
Write down the digital signal encoding format 
Subject Data Communication
NU Year 2012
Question
Explain error detection process
Subject Data Communication
NU Year 2012
Question
Describe the model of frame transmission for flow control
Subject Data Communication
NU Year 2012
Question
Describe the adoptive routing strategies  in the packet switch network 
Subject Data Communication
NU Year 2012
Question
What are the steps of  sliding window flow control ? Describe
Subject Data Communication
NU Year 2012
Question
Write short notes (any four):-
(a) TCP/IP
(b) Channel capacity
(c) Wireless transmission
(d) CRC
(e)Digital switch
(f)Packet switching network
Subject Data Communication
NU Year 2012
Question

Define standard. State and explain the characteristics  of data communication system

Subject Data Communication
NU Year 2011
Question

What is protocol? What are the key elements of protocol?

Subject Data Communication
NU Year 2011
Question
Describe TCP/IP model

Subject Data Communication
NU Year 2011 2015
Question
Briefly discuss about the Nyquist bandwidth and Shanon capacity formula

Subject Data Communication
NU Year 2011
Question
Define the terms frequency spectrum and bandwidth of a signal

Subject Data Communication
NU Year 2011
Question
What types of impairments are common in data communication.Describe different types of noise

Subject Data Communication
NU Year 2011
Question
Using Shannon's formula estimates the channel capacity of a voice grade telephone line-having SN ratio of 30dB and bandwidth 3400hz
Subject Data Communication
NU Year 2011
Question
Name the common guided transmission media and give the physical description application    areas and transmission characteristics of any one of them
Subject Data Communication
NU Year 2011
Question

Depict and describe VSAT communication system and explain it

Subject Data Communication
NU Year 2011 2015
Question

Why scrambling technique is used for digital to digital encoding? Depict and describe B8ZS or HDB3


Subject Data Communication
NU Year 2011
Question

Distinguish between AM, FM and PM

Subject Data Communication
NU Year 2011 2015
Question

Describe CRC technique for error detection

Subject Data Communication
NU Year 2011
Question

Describe the procedure of dial up operation using the interface of EIA- 232 interface

Subject Data Communication
NU Year 2011
Question

What is packet switching?Mention the advantages of packet switching over circuit switching

Subject Data Communication
NU Year 2011 2013 2015
Question

What is multiplexing?Describe synchronous time division multiplexing with figure

Subject Data Communication
NU Year 2011 2014
Question

Describe asynchronous transfer mode (ATM) with respect to switching mode, Packet size ATM cells

Subject Data Communication
NU Year 2011
Question

State necessity of Frame relay in communication network

Subject Data Communication
NU Year 2011
Question

Write short note with necessary diagram (any four) :

(a) QPSK

(b) HDLC

(c) Null model

(d) Cellular system

(e) Channel capacity  

Subject Data Communication
NU Year 2011
Question

With diagram explain frequency division multiplexing (FDM)

Subject Data Communication
NU Year 2011
Question

Distinguish between synchronous and statistical TDM  

Subject Data Communication
NU Year 2011
Question

Describe advantages and disadvantages  of optical fiber and twisted pair cable in brief

Subject Data Communication
NU Year 2011
Question

Describe propagation of light through optical fiber 

Subject Data Communication
NU Year 2011
Question

Write down the difference between simplex and duplex transmission mode with suitable example

Subject Data Communication
NU Year 2013
Question

Make a comparison between TCP/IP and OSI

Subject Data Communication
NU Year 2013
Question

Distinguish between connection oriented and connectionless protocols

Subject Data Communication
NU Year 2013
Question

Define protocol. List the key elements of protocol

Subject Data Communication
NU Year 2013
Question

Name the types of transmission impairments. Briefly explain the different types of noise with examples.


Subject Data Communication
NU Year 2013
Question

What does the Nyquist theorem and Shannon capacity formula have to do with communications?

Subject Data Communication
NU Year 2013
Question

We have a channel 5KHz bandwidth. If we want to send data at 150 kbps, what is the minimum SNR (dB)?

Subject Data Communication
NU Year 2013
Question

Define frequency, spectrum, bandwidth and buad rate with example.

Subject Data Communication
NU Year 2013
Question

What is unguided transmission media? What are the drawback of this?

Subject Data Communication
NU Year 2013
Question

Briefly explain ASK, FSK, PSK and QAM techniques with the principle advantages and disadvantages.

Subject Data Communication
NU Year 2013 2014
Question

Explain the Pulse Code Modulation (PCM) technique and state its limitation.

Subject Data Communication
NU Year 2013 2015 2014
Question

What is optical fiber communication? Explain the characteristics of this communication system

Subject Data Communication
NU Year 2013
Question

Explain about virtual circuit and datagram approach of pocket switching network with necessary diagram.

Subject Data Communication
NU Year 2013
Question

What is router and routing table? Explain the important characteristics of routing function


Subject Data Communication
NU Year 2013 2015
Question

Explain about X~25 protocol standard

Subject Data Communication
NU Year 2013
Question

Define multiplexing. What are the different types of multiplexing techniques?

Subject Data Communication
NU Year 2013 2014
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