Previous Year Exam Questions for Digital Switching and Telecommunication Networks - DSTN of 2017 - bput by Verified Writer

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Registration no : Total Number of Pages: 01 B.Tech. PEEC5417 7th Semester Regular / Back Examination 2017-18 Digital Switching and Telecommunication Networks BRANCH : CSE, ECE, ETC, IT, ITE Time: 3 Hours Max Marks: 70 Q.CODE: B374 Answer Question No.1 which is compulsory and any five from the rest. The figures in the right hand margin indicate marks. Q1 a) b) c) d) Answer the following questions : What do you mean by connection oriented services and connectionless services? What are non-blocking networks? What is traffic intensity? What is the unit of traffic? (2 x 10) g) h) i) j) Which of the layers in the ISO – OSI reference model are known as link-to-link layers and which layers as end-to-end layers? Define the terms Trunk and Trunking. List the advantages of crossbar switching system over step-by-step switching system. What is grading? Explain different types of grading. What are the various models in loss systems? What are the types of fundamental channels in ISDN? Compare the features of single stage and multi stage networks. Q2 a) b) With a neat figure explain the operation of a time switch. Explain the different types of switching. (5) (5) Q3 a) b) Compare S-T-S and T-S-T switching networks. Derive the expressions for GOS of T-S-T and S-T-S switching networks. (5) (5) Q4 a) b) Discuss the need for frame alignment in the time division switching networks. What is congestion? What is grade of service? How is it quantified? (5) (5) Q5 a) b) Explain with a neat diagram building block of a Digital switching system. Define the terms: a) Full availability b) Link systems c) Progressive grading. (5) (5) Q6 a) Design a 3-stage network for 100 incoming trunks and 400 outgoing trunks. Specify assumptions and draw the 3-stage network. Explain the role of exclusion device in load sharing configuration of SPC. (5) Explain with a neat figure the operation of a k  m size space switch. Give the equivalent representation using a space division network. (10) e) f) b) Q7 Q8 a) b) c) d) Write short answer on any TWO : Write short notes on distribution systems. Write short notes on stored program control (SPC) switching system. With a neat sketch explain crossbar switching and its operation. Explain with a neat diagram switching system hierarchy. (5) (5 x 2)