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2003 Course Voice Networks (I)

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Total No. of Questions : 12] P985 [Total No. of Pages : 3 [3664]-195 B.E. (E & TC) VOICE NETWORKS (2003 Course) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates:1) Answers to the two sections should be written in separate books. 2) Neat diagrams must be drawn wherever necessary. 3) Figures to the right indicate full marks. 4) Assume suitable data, if necessary. SECTION - I Q1) a) b) Write a Lex specification to read a C program and calculate number of new line characters, tabs and white spaces in the program. [8] Whether lexical analysis detects any errors? Explain with example.[8] OR Q2) a) b) c) Q3) a) b) Explain with example various compiler construction tools. [9] Why compilation phases are divided into front-end and back-end? what are the advantages? [4] Explain the following : [3] i) token ii) pattern iii) lexeme Show that the following grammar is LR(1) but not LALR(1) S Aa | bAc | Bc | bBa A d B d Explain Recursive-Descent parser with an example. [10] [8] OR P.T.O. Q4) a) b) Q5) a) b) Show that the following grammar is LL(1) but not SLR(1) [8] S AaAb | BbBa A B What is Shift-Reduce-Reduce conflict? How these can be resolved? With examples explain in which condition S-R and R-R conflict can occur in SLR, canonical LR and LALR parsers. (Make use of LR(0), LR(1) items. [10] Write a translation scheme to generate three address code for assignment sentences with array and pointer references. [8] Explain concept of back-patching with example. [8] OR Q6) a) b) Translate executable sentences of the following C program [8] main() { int i = 1; int a = [10]; while (i<=10) { } } into a) Syntax tree. b) Postfix notation. c) Three-address code. What are synthesized and inherited attributes? What are Marker Nonterminal symbols? Give example. [8] SECTION - II Q7) a) b) With example explain different parameter passing methods. Explain Runtime support and storage organization. [8] [8] OR Q8) a) What are different storage allocation strategies? Explain anyone in detail. [8] [3664]-195 2 b) Q9) a) b) Explain how the security aspect handled in GSM network. [8] Draw the architecture of IS-95 system and explain in detail various functional entities. [8] CDMA is having better security than GSM . Explain. [8] OR Q10)a) b) Describe physical and logical channels of IS-95. Compare IS-95 and CDMA-200 system in detail. Q11)a) Explain in detail various low level protocol used in IP telephony. [8] b) Describe speech coding technique i.e. ADPCM in detail. [8] [8] [8] OR Q12)a) b) Explain in detail DTMF generation and detection. Describe MEGACO and H.248 in detail. vvvv [3664]-195 3 [8] [8]

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