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Telecommunication Networks (Bbit 242) (Cisy 231) 3Rd Trimester 2015 Question Paper

Telecommunication Networks (Bbit 242) (Cisy 231) 3Rd Trimester 2015

Course:Bachelor Of Business Information Technology

Institution: Kenya Methodist University question papers

Exam Year:2015

TELECOM NETWORKS (BBIT 242) (CISY 231) 3rd trimester 2015
KENYA METHODIST UNIVERSITY

END OF 3'RD 'TRIMESTER 2015 (PT) EXAMINATION

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

INSTRUCTIONS

Answer question one and any other two questions
Question One (compulsory)

Why is synchronous transmission referred to as block by block transmission? Briefly describe how this transmission method works.
(4 Marks)
Given the baud how would the baud rate be calculated?
(2 Marks)
(i) What do analog signal impairments result in?
(2 Marks)
(ii) What do digital signal impairments result in? (2 Marks)
Briefly describe the following transmission impairments stating whether they occur in guided or unguided media;
Delay distortion
(2 Marks)
Free-space loss
(2 marks)
Multipath
(2 Marks)
State what the sampling theorem posits.
(3 marks)
List three advantages of digital transmission.
(3 Marks)

Describe the following types of connections;
(6 Marks)
Simplex
Half duplex
Full duplex
Name 2 error correction techniques
(2 Marks)
Question Two

In which layer(s) of the OSI model is cyclic redundancy checking used? Further describe how this technique performs error detection.
(6 Marks)
Use a diagram to show the error detection process.
(4 marks)
Under which circumstances would you perform longitudinal as opposed to vertical redundancy checkup? Hence perform a longitudinal as well as a vertical redundancy check on the following string using even parity (explain your working):
11000101 10000111 10010001 10000011 (10 marks)
Question Three

Describe the following compression methods and how you use each to compress the string given in brackets

Huffman coding (DDDDDDDWWWWWWWEEEEEEEEEEAAA)
(8 Marks)
Run length encoding (00000100000001000)
(6 Marks)
Explain the following terms as related to compression
Spatial compression
(3 Marks)
Temporal compression
(3 Marks)
Question Four

List 3 key differences between frame relay and x.25
(9 Marks)
Compare the 2 technologies in the following areas;
Reliability
(6 marks)
Streamlining
(5 Marks)

Telecommunication Networks (Bbit 242) (Cisy 231) 3Rd Trimester 2015 Question Paper

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