C3495
C3495
FOURTH SEMESTER (CBCSS-UG) DEGREE EXAMINATION APRIL. 2021
Common Course
A 13-DATA COMMUNICATION AND OPTICAL FIBERS
Time: Two Hours and a Half Maximum: 80 Marks
Section A
Answer at least ten questions.
Each question carries 3 marks.
All questions can be attended.
Overall Ceiling 30.
1. How is topology related to line configuration?
2. Why is synchronization a problem in data communication?
3. What are the functions of DCE? Give an example of a DCE.
4. How does FDM combine multiple signals to one?
5. What is the advantage of asynchronous TDM ?
6. How can the capacity of a GSM cell be increased?
7. What are toe reasons for the delays in a GSM system for packet data traffic?
8. What is the purpose of line discipline?
9. In what situation does the sender re-transmit a packet?
10. What are the uses of BSC control frames?
11 What are the advantages of FDDI over a basic Token ring?
12. What is the basic principle of propagation of light through the fiber?
13. What is a double heterostructure?
14. Define dark current as applied to a photo detector?
15. Define mode field diameter
(10×3=30 marks)
Section B
Answer at least five questions.
Each question carries 6 marks. All questions can be attended.
Overall Ceiling 30.
16. What are the four different methods that convert a digital signal to analog signal?
17. Write a note on twisted pair cables.
18. Explain in detail synchronous TDM.
19. What are the two basic groups of logical channels specified by GSM ?
20. What are the two methods that control the flow of data across the communication links.
21. In HDLC, what is bit stuffing and why is it needed?
22. What are the advantages of optical fiber communications?
23. Distinguish between LEDs and LASERS.
(5 x 6= 30 marks)
Section C
Answer any two questions.
Each question carries 10 marks.
24. Explain the different network topologies.
25. Explain the GSM system architecture.
26. Explain the three switching methods.
27. What are the different types of fibers used in optical fiber communications?
(2 ×10=20 marks)
നിങ്ങൾക്ക് ഉപകാരപ്പെട്ടെങ്കിൽ നിങ്ങളുടെ കൂട്ടുകാർക്ക് കൂടി ഷെയർ ചെയ്യുക
Share This
