Rashtrasant Tukadoji Maharaj Nagpur University 2012 B.E Electronics & Communication Engineering Summer , Faculty of Engineering and Technology, LINE COMMUNICATION AND SWITCHING SYSTEM - Question P

part A

1. (a) discuss the subsequent codes with suitable examples.
(i) Morse code
(ii) five unit code
(iii) 7.5 unit teleprinter code
(b) A teleprinter employing 7.5 unit start-stop code is transmitting at a speed of 60wpm, compute the speed in bouds and duration of stop element.

2. (a) discuss the subsequent terms:
(i) Simplex
(ii) Duplex
(iii) Bridge Duplex
(b) discuss the principle of operation of Morse Sounder.

3. (a) explain in brief operate lag and release lag and derive the expression for the identical.
(b) A Teleprinter has character represented by 1 begin element, 7 character element, 1 parity element, and 1 stop element, all of equal lengths. If teleprinter transmits 1 character in 100msec, what is the speed of transmission in bauds? How many printing and functional combinations are possible in the teleprinter transmission?

4. (a) Draw and discuss the working of the Central Battery Card Circuit. What is the importance of Sleeve Circuit?
(b) provide comparison ranging from Telegraph Relay and Telephone Relay.
(c) discuss the side tone. How does it affect a telephone communication? discuss the principle of Anti-Side Tone (ASTIC) Circuit.

5. Write short notes on (any four):
(i) Facsimile
(ii) Electronic Switching System
(iii) Boudot Multiplex
(iv) Telegraph repeaters.
(v) Signaling in Telex network.

part B

6. (a) Compare the manual and automatic exchanges.
(b) discuss the trunking diagram of 1000 line exchange. discuss every of the sector stages.
(c) discuss 2 Motion Selector with neat diagram.

7. What is Crossbar Switching System? discuss the principle of Crossbar Switching System. provide advantages of Crossbar system over Strowger System.
(b) discuss Common Channel Signalling (CCS) in detail.

8. (a) elaborate major techniques of signalling in a telecommunication? discuss any 1 technique in detail.
(b) discuss Subscriber Line Interface Circuit.
(c) discuss Mobile-to-Mobile Call System and Mobile-to-Fixed Call System with diagram.

9. (a) What is power line communication? discuss the various modes of coupling carrier equipment with the power line.
(b) elaborate Directional Filters? Do they possess any directional property?

10. Write short notes on any three:
(i) BORSCHT Functions
(ii) ISDN
(iii) PCM
(iv) Grade of Service.

Earning:   Approval pending.