42 what is meant by network topology describe three

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Unformatted text preview: ata communication system? 8. Differentiate between narrowband, voiceband, and broadband communication channels. Give a practical application of each. 9. What is a wire pair? In what situations are they suitable for use in data transmission? 10. What is a coaxial cable? Give some of its practical uses. 11. Explain how microwave systems can be used for communication between two distant stations. 12. How are communications satellites used? What are the possible advantages and limitations of using a communications satellite? 13. What is an optical fiber? How is it used for data communications? What are its advantages? 14. Differentiate between analog and digital transmission of data. Give their relative advantages and disadvantages. 15. What do you understand by modulation and demodulation? 16. Why is modulation used in signal transmission? Describe the three different forms of modulation used in signal transmission. 17. What are modems? What purpose do they serve in data communication systems? 18. Describe some of the common factors to be considered while selecting a modem. 19. Explain the use of "fall back" feature in the design of modems. 20. Differentiate between internal and external modems. Give their relative advantages and disadvantages. 21. What is a FAX modem? How is it more useful than a conventional modem? 22. Describe the error correction and data compression features found in some modems. 23. What is an intelligent modem? List out some of the features found in intelligent modems. 24. What is a repeater? 25. When are public telephone lines used to connect a terminal to a computer? Are modems required for this purpose? Why? 26. Explain about the following types of services offered by the common carriers: (a) Dial-up line (c) Integrated Services Digital Network (ISDN) (b) Leased line (d) Value Added Network (VAN) 27. What is ISDN? Differentiate between narrow-band and broad-band ISDN. 28. What is a Value Added Network (VAN)? 29. What is a multiplexer? Exp...
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This document was uploaded on 04/07/2014.

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