UNIT 2-Data Communication Concept
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1 UNIT 2-Data Communication Concept 2. a) Define: i) Non-return to zero codes 2015 June ii) RZ Codes b) List out the difference between serial and parallel transmission. c) What are the advantages of Asynchronous transmission over synchronous transmission? d) Write short notes on: i) Simplex Transmission ii) iii) Full Duplex Transmission Half Duplex Transmission OR What is line configuration? Explain with examples? 2014 Dec 2. a) Explain the terms- simplex, half duplex and full duplex data transfer. b) What are the different types of serial communications? c) What does the term 'MODEM' stand for? What is the function of a modem?
2 d) Explain the different line coding schemes used in data communications. Or What is line configuration? What are the advantages of a multipoint connection over a point-to-point connection? 2013 Dec 3. a) What is data transmission. Explain briefly Parallel and Serial transmission and synchronous and synchronous transmission. b) Find the maximum bit rates for FSK signal. If the bandwidth of the medium is Hz and the difference between the two carriers is 2000Hz. Transmission is in fuel duplex mode. OR 4. a) How many amplitude levels are there for each of the following methods? (i) Unipolar (ii) PVRZ-L (iii) NRZ-I (iv) RZ (v) Manchester b) What is line configuration? Explain the terms of point to point and point to multipoint configuration. III. Explain the following : 2012 Dec (a) Synchronous and Asynchronous Transmission (b)rz and NRZ codes OR
3 IV Explain the following (a) (b) Parallel & serial transmission Point to point and point to multi point configuration. SHIVANI 2013 SHORT P. Find the maximum bit rates for FSK signal. If the bandwidth of the medium is Hz and the difference between the two carriers is 2000 Hz. Transmission is in full-duplex mode. Q. What is data transmission? Explain briefly parallel and serial transmission and synchronous and asynchronous transmission. Q. How many amplitude levels are therefore each of the following methods? (i) Unipolar (ii) NRZ-L (iii) NRZ-I (iv) RZ (v) Manchester. Q. What is line configuration? Explain the terms of point to point and point to multipoint configuration Q. Explain parallel and serial transmission. Q. Explain the asynchronous and synchronous transmission in brief. Q. Explain the RZ and NRZ codes.
4 Q. Explain the point to point and point to multipoint configuration. Q. Write short note on RS-423A. Q. Explain modem SHORT Q. Explain the asynchronous transmission with their frame structure. Q. Give the difference between asynchronous and synchronous transmission. Q. Explain the following with the help of examples (i) Simplex (ii) Half duplex (ill) Full duplex. Q. Give comparison among simplex, half duplex, and full duplex with suitable examples. P. What do you mean by synchronous transmission? Compare the efficiency of sending a 256-byte message synchronously and asynchronously. The synchronous transmission needs an 8-byte preamble for clock recovery. Q. What is line coding? Explain unipolar and bipolar line codes. Q. Write short note on RS-449. Q. Explain various digital interface standards. Q. Why are line splitters used in data communication?
5 Q. Explain the difference among short-wave modems, facsimile modems and fax modems SHORT Q. Differentiate between serial and parallel transmission. Q. Explain bipolar line codes. Q. Differentiate between serial and parallel transmission with example. Q. Differentiate between synchronous and asynchronous transmission. Q. Explain simplex, half duplex and full duplex transmission. Give one example for each. Q. Explain briefly different transmission modes. Q. Discuss about the different network components, functions and features. P. Draw the signal waveform when is transmitted using the following codes - (i) NRZ-L (iii) Biphase-M (ii) NRZ-M (iv) Differential Manchester. Q. Explain briefly the principle of working of modem. Q. What is point to point and multipoint configuration?
6 Others SHORT P. Deduce the number of additional bits required to transmit a message comprising one hundred 8-bit characters over a data link using each of the following transmission control schemes - (i) Asynchronous with one start bit and two stop bits per character and a single start of frame and end of frame character per message. (ii) Synchronous with two synchronization characters and a single start of frame and end of frame character per message. (R.G.P.V., Dec. 2005) Q. Differentiate between serial and parallel transmission. Q. Explain half duplex mode. Suppose a half duplex mode is selected on a session, what should be done about the people at terminals trying to type when it is not their turn? P. A company wishes to transmit numerous 1000 byte files between two locations. Each byte consists of eight data bits, no parity bits are used in this application. Error is not a factor for either transmission method. (i) What is the overhead percentage if a single file is sent asynchronously? (ii) What is the overhead percentage if the file is sent synchronously using blocks with 100 data bytes in each block and each block is accompanied by 15 special bytes? Q. Explain the main transmit and main receive functional blocks of a modem. Explain the function of each unit.
7 Q. Write short note on short-wave modems. Q. Write short notes on parallel and serial transmissions. Q. Explain the asynchronous and synchronous transmission in brief. Q. Compare the overhead in an asynchronous system versus a synchronous system. How is the overhead partitioned in each? Which is more efficient, in terms of the overhead to send several characters? Why. (R.G.P. V., Dec. 2004) Q. Describe the asynchronous transmission control scheme with their frame structure. Explain how synchronization is achieved in it Explain the framing error. Q. Describe the asynchronous transmission control scheme with the frame structure. Q. Differentiate between synchronous and asynchronous transmission. Q. Explain the following with the help of examples (i) Simplex (ii) Half duplex (ill) Full duplex. Q. Give comparison among simplex, half duplex, and full duplex with suitable examples. Q. Explain and compare simplex, half duplex and full duplex with suitable examples. Q. A DTE and a DTE are to be connected. Sketch the interconnection that must be built.
8 Q. What is the function of a "null modem"? Show the internal connections used within a null modem with explanation. Q. Write short note on high speed modems. Q. What are fax modems? Draw and explain the group III facsimile transmit and receive block. Q. Draw and explain the group III facsimile transmit and receive block. (R.G.P.V., June 2004) Q. Write short notes on the following (i) 56 K modems (ii) Cable modem. Q. Explain the purpose of null modem. Describe the datapins of null modem. Q. Explain why a pair of modems is required to transmit the digital signals over a long telephone line.
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