Monday, March 29, 2010

Questiom of TELECOMMUNICATION SYSTEMS (sem-5) -2009

                               TELECOMMUNICATON SYSTEM
                             CS/B.tech(ECE)SEM-5/EC-501/209-10

1. Choose the correct Alternative.
 (1) In modem uploading data rates always less then downloading data rates because
   (i) SNR (20db)is very low in communication channel.
   (ii) quantisation noise limits the channel data rates
   (iii) during uploading extra control bits are added with the data
   (iv) none of these.
 (2) the voice signal BW is 4 KHz and the Nyquist sampling rate is 8 KHz and time multiplexed space swiching 30 channel is to be multiplexed. the TS is
   (i) 4.16 micro sec (ii) 8.33 micro sec. (iii)125 micro sec (iv) none of these
 (3) MTTR means
   (i) Mean time to repair (ii) Maximum time to repair
   (ii) Most time to repair (iv) mean time to represent.
 (4) Blocking probability is
    (i) call congestion (ii) time congestion (iii) both (i) and (ii). (iv)none of these
 (5) GOS in india is
   (i)0.002 (ii) 0.02 (iii) 0.2 (iv) 2.
  (6) ISDN B-channel carries data and service at
    (i) 16 kbps (ii) 32 kbps (iii) 64 kbps (iv) 1.544 Mbps
 (7) Loudspeaker is an end instrument of
   (i)transmitter side (ii) receiver side (iii) both (iv) none of these
 (8) CHILL is a
    (i) CCITT language (ii) IEEE language (iii) IEE language (iv) ANSI language.
 (9) Attenuation can be reduced in subscriber loop by using
   (i) higher diameter in copper wire (ii) series of inductance in line
   (iii) lower diameter in copper wire (iv) serise of capacitance in line.
 (10) SDL stands for
    (i) software description language (ii) specification derived language
    (iii) specification description language (iv) sofeware derive language.
(11) A subscriber makes 3 calls of 3 mints , 4 mints, and 2 mints duaration in one hour period Calculate the subscriber traffic in Erlangs.
   (i)0.15 E (ii) 0.2E (iii)0.5E (iv) 0.7 E
 (12) In a  Strowger system the high value of CCI indicates
   (i) good design (ii) poor design (iii) no impact on design (d) none of these
                       GROUP - B
 Answer any three
 2 (a) What do you mean by point to point communication ?
   (b) Explain the disadvantages of this system
   (c) If the number of node in point to point communication is 770 , find out the total number of links required for total connevtivity.
3. (a) Show the GOS =  p b  , explain the meaning of the symbol.
   (b) Over a 20 minute observation interval, 40 subscribers initiate calls. Total duration of the calls is 4800 sec . calculate the load offered to the network by the sescribers and the average subscriber traffic.
4. What is call completion rate (CCR) ? 10000 subscribers are connected to an exchange , if the exchange is designed to achieve a CCR of 0.8 when the busy hour calling rate is 4.8 , calculate BHCA of the exchange.
5. What is BORSCHT function ? Why is this important in electronics exchange.
6. How many type of transmission medi are used in telecommunication ? What are the advantages of twisted pair cable over parallel wire cable ? what is step index fiber and graded index fiber?
                    GROUP -C
Answer any there
7 (a) assuming simultaneously forward and backward wave propagation in a transmission line. Derive the follwing general equation for the line,
    V=V1cos hrd +I1Z0sinhrd,
    I= I1coshrd+I1/Z0 sinhrd,
   Where V and I are the voltage and current respectively at a distance from a load end of the transmission line having characteristic independence Z0 and propagation constant r. the load end voltage and current V1 and I1respectively.
 (b) A loseless line has a characteristics impedance of 75 ohm and is terminated in a load of 300 ohms . find out the reflection cofficient and VSWR in the line.
  (c) explain the principle of DTMF dialing.
8. (a) what ia ISDN? Explain the transmission channel in ISDN?
   (b) what are the drawbacks of ISDN? how does B-ISDN overcome from this?
  (C) Write function grouping and reference point in ISDN.
9. (a) Explain centralized SPC and different modes of it.
(b) Explain distributed SPC and explain the different types of leve processing in it.
 (c) In the load sharing configuration of centralised SPC MTBF =2000 hours and MTTR =4 hours calculate the unavailability for single and dual processor system.
(d) Explain time division space switching.
10. What is DTE and DCE? Explain how data communication takes place between DTE and DCE using RS @#@C serial interface. why is conventional telephone modem down stream data rate 56 kbps? A telephone line has a bandwidth of 3000 Hz and SNR is 34 Db calculate the data rate of this line.
11. Write short notes on any three of the following.
(A) Packet switching
(b) ISDN systems interface.
 (c) Difference between circiut switch , packet swith and message swith
(d) Modems and standards
(e) facsimile transmission.

12 comments:

Amit said...

good to see this post.Keep posting
bba

Anonymous said...

Here is a list of my favoriate songs: Do You Remember - By Jay Sean, Bulletproof - By La Roux, I Can't Stop Loving You - By Ray Charles, Walk This Way - By Aerosmith, Kandi - By One Eskimo, Billionaire [Feat. Bruno Mars] - By Travie McCoy, Caroline - By No, Flash Light - By Parliament, Just Dance - By Lady Gaga, Nothin' On You [Feat. Bruno Mars] - By B.o.B, Street Fighting Man - By The Rolling Stones, He's a Rebel - By The Crystals, Use Somebody - By Kings Of Leon, Down - By Jay Sean, Mack the Knife - By Bobby Darin, It's Your Thing - By The Isley Brothers. You can listen to these [url=http://all-free-music-downloads.com/]Free Music Downloads[/url] Online for free.

Anonymous said...

Here is a list of my favoriate songs: A Little More Country Than That - By Easton Corbin, Giddy On Up - By Laura Bell Bundy, Wonderful World - By Sam Cooke, Thirteen - By Big Star, American Honey - By Lady Antebellum, Mars Vs. Venus - By Usher, All Along the Watchtower - By Jimi Hendrix, For What It's Worth - By Buffalo Springfield, Hello Good Morning - By Diddy - Dirty Money, Hot N Cold - By Katy Perry, What's Love Got To Do With It - By Tina Turner, He's a Rebel - By The Crystals, TiK ToK - By Ke$ha, Need You Now - By Lady Antebellum, La Bamba - By Ritchie Valens, Walk Away Renee - By The Left Banke. You can listen to these [url=http://review-music-downloads.com/]MP3 Music[/url] Online.

Anonymous said...

Here are some of my favoriate songs: A Little More Country Than That - By Easton Corbin, Giddy On Up - By Laura Bell Bundy, The Thrill Is Gone - By B.B. King, Stayin' Alive - By The Bee Gees, There Is A Way - By Newworldson, Mars Vs. Venus - By Usher, Whipping Post - By The Allman Brothers Band, Flash Light - By Parliament, How Low - By Ludacris, Hot N Cold - By Katy Perry, Dance to the Music - By Sly and the Family Stone, He's a Rebel - By The Crystals, Everything To Me - By Monica, Do You Remember - By Jay Sean, I Put a Spell on You - By Screamin' Jay Hawkins, Tutti-Frutti - By Little Richard. You can listen to these [url=http://my-music-downloads.com/]Free MP3 Music[/url] Online for free.

Anonymous said...

Here are some of my favoriate songs: Do You Remember - By Jay Sean, Party In The U.S.A. - By Miley Cyrus, Yesterday - By The Beatles, Thirteen - By Big Star, Hillbilly Bone [Feat. Trace Adkins] - By Blake Shelton, Life After You - By Daughtry, Caroline - By No, Me and Bobby McGee - By Janis Joplin, How Low - By Ludacris, Baby - By Justin Bieber, Bohemian Rhapsody - By Queen, California Dreamin' - By The Mamas and The Papas, Everything To Me - By Monica, All The Way Turnt Up - By Roscoe Dash, I Put a Spell on You - By Screamin' Jay Hawkins, Why Do Fools Fall In Love - By Frankie Lymon and the Teenagers. You can listen to these [url=http://e-music-downloads.com/]Free MP3 Music[/url] Online for free.

Anonymous said...

[url=http://www.onlinecasinos.gd]casino[/url], also known as operative casinos or Internet casinos, are online versions of top-level ("mate and mortar") casinos. Online casinos approve gamblers to skedaddle role in and wager on casino games thoroughly the Internet.
Online casinos habitually bid odds and payback percentages that are comparable to land-based casinos. Some online casinos contend higher payback percentages with a incident function automobile games, and some indite non-military payout interest audits on their websites. Assuming that the online casino is using an correctly programmed unsystematic consolidate up generator, catalogue games like blackjack comprise an established forebears edge. The payout patch up hound of these games are established at on the horizon the rules of the game.
Multifarious online casinos sublease or in into the care of their software from companies like Microgaming, Realtime Gaming, Playtech, Supranational Manoeuvre Technology and CryptoLogic Inc.

Anonymous said...

Thank you for every other informative website. Where else may
just I get that kind of info written in such an ideal manner?
I have a challenge that I am just now running on, and I've been at the look out for such info.
my website: play online

Anonymous said...

top [url=http://www.c-online-casino.co.uk/]online casinos[/url] brake the latest [url=http://www.realcazinoz.com/]free casino[/url] manumitted no deposit perk at the leading [url=http://www.baywatchcasino.com/]casino compensation
[/url].

Anonymous said...

Simply wish to say your article is as astonishing.
The clearness on your publish is simply nice and that i could assume
you are an expert in this subject. Well along with your permission let me to clutch your feed to keep up to date with
imminent post. Thanks a million and please continue the enjoyable work.



Here is my weblog :: buying a car with bad credit
Feel free to surf my web page - buying a car with bad credit,buy a car with bad credit,how to buy a car with bad credit,buying a car,buy a car,how to buy a car

Anonymous said...

Hello outstanding blog! Does running a blog such as this require a massive amount work?
I have no expertise in computer programming
but I had been hoping to start my own blog soon. Anyways, should you
have any recommendations or tips for new blog owners please share.
I know this is off subject but I just wanted to ask. Thank you!


my homepage; buying a car
Also see my web site :: buying a car with bad credit,buy a car with bad credit,how to buy a car with bad credit,buying a car,buy a car,how to buy a car

Anonymous said...

Right now it seems like BlogEngine is the best blogging platform out there right now.
(from what I've read) Is that what you're
using on your blog?

Here is my web blog buy a car
Here is my web blog buying a car with bad credit,buy a car with bad credit,how to buy a car with bad credit,buying a car,buy a car,how to buy a car

Anonymous said...

to buy mgUbGIdm [URL=http://www.cheapdesigner--handbags.weebly.com/]discount designer handbags[/URL] and check coupon code available CucsdMUv [URL=http://www.cheapdesigner--handbags.weebly.com/ ] http://www.cheapdesigner--handbags.weebly.com/ [/URL]