ESS.doc - DECEMBER 2008 Code DE20 Subject ELECTRONIC SWITCHING SYSTEMS Time 3 Hours Max Marks 100 NOTE There are 9 Questions in all Question 1 is

ESS.doc - DECEMBER 2008 Code DE20 Subject ELECTRONIC...

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DECEMBER 2008 Code: DE20 Subject: ELECTRONIC SWITCHING SYSTEMS Time: 3 Hours Max. Marks: 100 NOTE: There are 9 Questions in all. • Question 1 is compulsory and carries 20 marks. Answer to Q. 1. must be written in the space provided for it in the answer book supplied and nowhere else. • Out of the remaining EIGHT Questions answer any FIVE Questions. Each question carries 16 marks. • Any required data not explicitly given, may be suitably assumed and stated. Q.1 A Choose the correct or the best alternative in the following: (2x10) a. Engaged tone is generated in the: (A) Telephone instrument of calling subscriber (B) Telephone instrument of called subscriber (C) Exchange (D) Repeater b. One Erlang is equal to (A) 3600 CCS (B) 36 CCS (C) 60 CCS (D) 24 CCS c. The analog signal needs to be sampled at a minimum sampling rate of: (A) 2fs (B) 1/(2fs) (C) fs/2 (D) 2/fs d. In a time division space switch the size of the control memory is N and its Width: (A) (B) (C) (D) where N are the outlets and M the number of data samples e. In a single stage network : (A) There is no redundancy (B) There is redundancy (C) Alternative crosspoints are available (D) Alternative paths are available
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f. Signaling transfer point (STP) exist in (A) Strowger exchange (B) SS7 (C) Local area network (D) PABX g. ARQ is transmitted in the event of: (A) Loss of signal (B) Error in received data (C) Improve reliability (D) During time out h. Computer to computer communication is: (A) Simplex (B) Duplex (C) Half Duplex (D) Both Duplex and Half Duplex i. A distributed network configuration in which all data/information pass through a central computer is (A) Bus network (B) Star network (C) Ring network (D) Point to point network j. An important terminal that is required between DTE and PSTN is (A) Server (B) MODEM (C) Relay (D) Network card Answer any FIVE Questions out of EIGHT Questions. Each question carries 16 marks. Q.2 a. Describe the nature of signals produced on the subscriber’s loop by a pulse dialer, and a touch tone dialer. (8) b. Draw a 100 line exchange using two motion selectors and explain, how switching takes place in it. (8)
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Q.3 a. List the major difference in Single Stage, Two Stage and Three Stage Networks. Also discuss their blocking characteristics. (8) b. How time slot interchange switch works in time multiplexed time switching, explain using schematic. (8) Q.4 a. What are different control function categories, explain how they help in signalling and control. (8)
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