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Telecommunication Networks (Bbit 242) (Cisy 231) 2Nd Trimester 2015 Question Paper

Telecommunication Networks (Bbit 242) (Cisy 231) 2Nd Trimester 2015

Course:Bachelor Of Business Information Technology

Institution: Kenya Methodist University question papers

Exam Year:2015

TELECOMMUNICATION (BBIT 242) (CISY 231) 2nd trimester 2015
KENYA METHODIST UNIVERSITY

END OF 2'ND 'TRIMESTER 2015 (FT) EXAMINATION

FACULTY : COMPUTING & INFORMATICS
DEPARTMENT : COMPUTER SCIENCE & BUSINESS INFORMATION
UNIT CODE : BBIT 242/CISY 231
UNIT TITLE : TELECOMMUNICATION NETWORK
TIME : 2 HOURS

Instructions:

Question One

Distinguish between the following pairs of terms as used in telecommunication
Bit rate and baud rate
(2mks)
Lossy and lossless compression.
(2mks)
EBCDIC and standard ASCII.
(2mks)
Outline key strengths and limitations of the following no mission modes
Parallel
(3mks)
Serious
(3mks)
What is meant by the term cell in mobile communication.
(3mks)
Elaborate on reasons why forward error correction techniques are better preferred to backward error correction technique. Give an example of each.
(6mks)
What strategies can be applied to deal with data congestion in a network? Discuss.
(9mks)
Question Two

Use the table below to answer the underlying questions

Characters A B C D
Frequency 9 13 20 8

Using Huffman coding, show how the text ABBCCD would be represented.
(7mks)
State the run-length encoding of the compressed data, using the table above.
(2mks)
b) Why are single bit errors least likely to occur in serial data transmission? (3mks)
c) Describe any four error detection methods used in data communication. (8mks)
Question Three

What attributes make packet switching preferable over circuit switching?
(6mks)
Discuss how data is transmitted over a fibre optic cable. Use appropriate diagram(s) to illustrate.
(6mks)
Distinguish between a straight through and cross-over cable connectors. State where each of applicable.
(4mks)
Suppose a router can be able to receive packets but not pass to another device, how can this problem be solved.
(4mks)
Question Four

State the salient features of 3G and 4G cellular systems.
(6mks)
Three types of cells used in cellular networks are
Macrocell
Microcell
Picocell
Describe the characteristics of each. (6mks)
Discuss how each of the following multi-plexing techniques work.
Statistical TDM.
(4mks)
Synchronous TDM
(4mks)

Telecommunication Networks (Bbit 242) (Cisy 231) 2Nd Trimester 2015 Question Paper

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