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2003 Course Voice Networks

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Total No. of Questions :12] P1146 Time : 3 Hours] [Total No. of Pages : 3 [3864]-262 B.E.(E&TC) VOICE NETWORKS (2003 Course)(404215) [Max. Marks : 100 Instructions to the candidates: 1) Answer three questions from Section I and three questions from Section II. 2) Attempt not more than six questions of which at least three questions must be from each Section. 3) Answers to the two sections should be written in separate books. 4) Neat diagrams must be drawn wherever necessary. 5) Figures to the right indicate full marks. 6) Use of logarithmic tables, slide rule, Mollier charts, electronic pocket calculator and steam tables is allowed. 7) Assume suitable data, if necessary. Q1) a) b) c) SECTION-I Explain in detail various subscriber loop signaling systems used in Telephone Switching. [8] Describe role of redundancy in Stored Program Control Electronics Switching systems. How it is achieved in its different configuration? [6] Enlist four distinct points between Single stage and Multistage network. [4] OR Q2) a) b) c) Describe with necessary diagram the working of Time multiplexed space switch. Calculate the number of trunks that can be supported on a time multiplexed space Switch, given that i) 64 channels are multiplexed in each stream. ii) Control memory access time is 50 ns. iii) Bus switching and transfer time is 50 ns per transfer. [8] List at least six differences between the postal and telephone systems and bring out the analogy between S&F and circuit switched connections. [6] What are the differences between common control and direct control? [4] P.T.O.

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