JNTU
JNTU B.Tech III TELECOMMUNICATION SWITCHING SYSTEMS AND NETWORKS Previous Question Paper (December - 2018 - R15)
Part A is compulsory. Answer any one full question from each unit in Part B.
Part A
Give applications of Delay formulae.
Answer
Delay formulae, such as Erlang-C, are primarily used to determine the probability of call waiting in queuing systems and to calculate the average waiting time for customers in call centers or telecommunication networks.
Discuss the classification of switching systems.
Answer
Switching systems are classified into two main categories: Manual switching systems, where operators establish connections, and Automatic switching systems, which include Electromechanical systems (Step-by-step, Crossbar) and Stored Program Control (SPC) systems (Analog and Digital).
For a ideal grading, state the erlangs grading formula.
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Define availability, unavailability and reliability.
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Discuss the compelled signaling and channel associated signaling
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Explain the CCTT no 6 signaling.
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What are the features of ATM?
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A pure ALOHA system used a 56 k bits /channel on average, each terminal originates a 1024 bit packet every 30 seconds. How many terminals can the system accommodate?
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What is ISDN? What are the services of it?
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Discuss the charging.
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Part B
Discuss the principle of the cross bar switching.
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Draw a lost call system and obtain the grade of service of the loss system with N full availability trunks.
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Draw a Queuing system and derive an second order erlang distribution formula.
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Explain the functions of switching systems.
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Explain the grade of service of a two stage networks in mode 1 and mode 2 of the link system.
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Explain the time multiplexed time switching.
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Explain the principle of the time switch.
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Draw and explain the signal exchange diagram for a call.
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What is multiframing. Explain the use of the multiframe for signaling in 32 channel PCM.
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Explain the signaling networks used for common channel signaling.
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Draw the block schematic diagram of a voice frequency receiver also discuss the signaling methods used for it.
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Draw the frame structure of a HDLC control and explain.
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Compare BUS and RING networks.
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An ATM network uses transmission links that operate at 150 M bits/s and have a propagation delay of 5 μs per km. it uses cells of length 53 octets, consisting of 5-octact header and a 48 bit information field. The maximum delay introduced by the switching centre is 300 cells. Find the maximum delay encountered by a telephone call over a connection of length 500km that passes through six switching system.
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Differentiate between the LAN and WAN.
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Discuss the main difference between the frame relay and x.r5 packet switching.
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Explain the principle of the cellular mobile radio system.
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Draw the British telecom IDN network and explain.
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Draw and explain the intelligent network architecture.
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Explain the basics of routing.
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