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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. Q4) a) Following data is collected to estimate voice traffic during 2 hour period Call No. 1 2 3 4 5 6 7 b) c) Q5) a) b) Call Duration in seconds 85 89 76 110 92 68 54 calculate the traffic intensity in Erlangs, CS and CCS. [6] Describe different traffic measurement units in telecommunication network. [6] Define call congestion and time congestion. [4] With the help of neat diagrams explain different services supported by ISDN. [8] Describe the significance of B and D channel in ISDN. [8] OR Q6) a) b) Explain in detail ISDN interfaces. [8] Describe Non-voice and value added services provided by ISDN. [8] SECTION - II Q7) a) b) Explain in detail various mechanism to enhance spectral efficiency.[10] Explain Radio link features in GSM system. [8] OR Q8) a) b) Describe in detail logical channels used in GSM system. Explain how the security aspect handled in GSM network. Q9) a) Draw the architecture of IS-95 system and explain in detail various functional entities. [8] b) CDMA is having better security than GSM . Explain. OR [3664]-195 2 [10] [8] [8] Q10)a) b) Describe physical and logical channels of IS-95. Compare IS-95 and CDMA-2000 system in detail. Q11)a) Explain in detail various low level protocols 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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