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2003 Course Voice Networks (II)

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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) c) What are the different levels of control functions in a distributed SPC? Explain the operations of each level in detail. [8] Explain the memory controlled time division time switching with neat diagram. [6] Calculate the unavailability of the dual processor system for a period of 30 years if its MTBF = 4000 Hrs. and MTTR = 9 Hrs. [4] OR Q2) a) b) c) Q3) a) b) c) Explain the concept of message switching and packet switching in a typical S & F switching network. [8] Describe in detail Interoffice switch signaling. [6] Calculate the availability of the dual processor system for a period of 25 years if its MTBF = 2500 Hrs. and MTTR = 6 Hrs. [4] A call processor in an exchange requires 120 ms to service a complete call. What is the BHCA rating for the processor? If the exchange is capable of carrying 700 Erlangs of traffic, what is the call completion rate? Assume an average call holding time of three minutes. [6] Define and explain the Erlang C formula for blocking probability.[6] Define Grade of service & blocking probability. [4] OR P.T.O.

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