Babu Madhav Institute of Information Technology, UTU : DSE6-Satellite and Telecommunication

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1 Babu Madhav Institute of Information Technology, UTU : DSE6-Satellite and Telecommunication 2017 Unit 1. Telecommunication Systems and Networks Short Questions 1. Define Telecommunication. 2. What is the functionality of POTS? 3. What do you mean by circuit-switched connection? 4. What SS7 is consist? 5. What is Electromagnetic spectrum? 6. PSTN interoffice call is made through which line? 7. What is quadrature amplitude modulation? 8. List out three application of the wireless network. 9. What is the function of main distribution frame? 10. What is the function of trunk distribution frame? 11. What are forward and reverse channel used in telecommunication system? 12. What is the function of control channel? What are its types? 13. What is SID? Long Questions 1. Differentiate in-band and out-band signalling. 2. Discuss about today s existing network infrastructure with proper diagram. 3. Write a detail note on history and evolution of wireless radio systems. 4. Compare and contrast early and latest telecommunication system in terms of signalling. 5. For a city there are two local telephone exchanges are namely Exchange 1 and Exchange 2 respectively. If the user A from Exchange 1 calls to user B located in Exchange 2, describe how the call is setup? Also state component involve establishing the call. 6. Describe the public data network in detail using diagrams. 7. Write a detail note on broadband cable system with proper diagrams. 8. Draw a conceptual structure of the Internet and explain it in detail. 9. Describe a cellular telephone use that would be considering an infotainment use. 10. Explain the various wireless network applications. 11. Differentiate connection less and connection oriented with respect to telephone systems. 12. Write a detail note cellular telephone concept. 13. Explain the PSTN in detail with necessary diagrams. 14. Explain the network elements of the Signalling System #7 system. 15. Compare and contrast 1G, 2G, 2.5G, 3G and 4G network. Multiple Choice Question 1. In connection oriented architecture a) you need to establish communication b) sometime connection requires c) connection is not required d) connection is establish SAPAN NAIK 1

2 2. In Telecommunications, PCM is known as a) Pulse-case modulation b) Pure-code modulation c) Prime-code modulation d) Pulse-code modulation 3. The interface local exchange or Mobile switching center with signal transfer point. a) STP b) SCP c) SSP d) RCL 4. The use In Band Signaling. a) PDN b) CCIS c) PSTN d) SS#7 5. GSM is used in. a) Voice Network b) Data Network c) Both d) None of above 6. IEEE used for. a) Bluetooth b) MAN c) WAN d) Wireless LAN 7. AMPS (Advanced Mobile Telephone System) is of a) India b) UK c) US d) France 8. Which of these are Digital Cellular Technologies a) IS:54 / IS -136 N-America b) GSM Europe and Asia c) IS-95 N America d) All of the above 9. known as father of Radio. a) Greham bell b) Macroni c) Fessden d) None of above

3 Babu Madhav Institute of Information Technology, UTU : DSE6-Satellite and Telecommunication Combinations of dots & dashes used for alphanumeric characters is known as a) Macroni Code b) Morse Code c) Hertz Code d) All of above 11. PDN Stands for. a) Public Data Network b) Private Digital N/w c) Both A & B d) None of above all 12. VPN means. a) Virtual Public Network b) Virtual Processors Network c) Virtual Private Network d) All of above 13. RCL stands for. a) Remote Computer Link b) Remote Communication Lab c) Redundant Communication Links d) None of above 14. NAP means. a) National Access Point b) Network Access Points c) Neutral Access Point d) Network automated Points 15. ADSL stands for. a) Advance Digital Subscriber Line b) Adaptive Digital Subscriber line c) Advance Direct Service Link d) Automatic Direct Synchronous Link 16. The American Telephone & Telegraph (AT&T) was founded in which year? a) 1855 b) 1865 c) 1875 d) Which is the faster way of communication? a) Twisted pairs b) Coaxial cables c) Optical fiber SAPAN NAIK 3

4 d) All 18. What is the type of signalling used between two exchanges? a) inband b) common channel signaling c) Both a & b 19. The situation when both transmitter and receiver have to work in tandem is referred to as a) parallel b) serial c) synchronous d) asynchronous 20. Trunks are the lines that run between a) subscribers and exchange b) switching system and power palnt c) local area network d) switching station 21. Common channel signalling in SS7 is a) out band control channel b) in band control channel c) speech control channel Fill in the Blanks 1. AM Stands for. 2. FM stands for. 3. PDN N/W is used to provide services (data, Voice). True/False 1. Local Exchange & Company office both is same. 2. QAM is a digital modulation technique. 3. SS#7 use out band signaling. 4. Today s existing infrastructure consisting of both PSTN & PDN. 5. Wireless Access Point is a device that allows computers to access a wired n/w using radio waves. 6. Broadband is a high capacity telecommunication pipeline capable of providing high speed Internet service. 7. Bandwidth refers to the capacity of communication line. 8. QAM is a hybrid form of amplitude and phase modulation. 9. Connection Oriented and Connection less services both are same. 10. Trunk Line is a line which connects a local exchange with another local exchange. 11. Modem Stands for Modulator Demodulator. 12. Internet is network of networks.

5 Babu Madhav Institute of Information Technology, UTU : DSE6-Satellite and Telecommunication In internet routers are connected by WAN backbone. 14. Wireless Local Area N/w is popularly known as WLAN. 15. Raw transmission of bits is responsibility of Physical Network. 16. Wireless Access Point is a device that allows computers to access a wired n/w using radio waves. 17. The GSM, TDMA, CDMA, CDPD are all 2G technologies. 18. The GPRS was designed to provide voice services at higher data rates. 19. The first generation cellular system used analog frequency modulation schemes for the transmission of voice message. 20. The 1G cellular system uses time division multiplexing to increase system capacity. Unit 2. GSM Technology Short Questions 1. What is the standard bandwidth of a GSM channel? 2. Name the three major subsystem of a GSM wireless cellular network. 3. Give the duration of single timeslot of a TDMA frame in microseconds? 4. What is the purpose of the GSM burst training sequence? 5. What is the purpose of flag bit used in normal burst? 6. Which are the two states in a mobile can be? 7. What GSM control channel is specifically tasked with the facilitating of the handover operation? 8. The GSM MS roaming number is constructed according to what numbering plan? 9. What purpose does the TMSI number have? 10. Define the "attached" condition for a GSM mobile. 11. Define the "detached" condition for a GSM mobile. 12. What is the purpose of periodic location updating? 13 What is the basic difference between intra-bsc handover and inter-bsc handover? 14. What is the basic difference between inter-bsc handover and inter-msc handover? 15. What is the first operation performed by a NA-TDMA mobile upon powering up? 16. List the operations performed during a call setup. 17. Why there is a difference of three timeslots between uplink and downlink TDMA frame? 18. Provide the uplink frequency range for primary GSM-900 band. Long Questions 1. Looking at the HLR/VLR database approach used in GSM - how does this architecture limit the scalability in terms of users, especially moving users? 2. What is the duration of GSM air interface timeslot? Also prove that the overall bit rate over the air interface is approximately kbps for GSM system. 3. Name the main elements of the GSM system architecture and describe their functions. What are the advantages of specifying not only the radio interface but all the internal interfaces of the GSM System. 4. Describe the function of MS and SIM. Why does GSM separate the MS and SIM? SAPAN NAIK 5

6 5. The maximum distance allowed by the Timing Advance between the mobile station and base transceiver system in GSM system is 35 km. Justify your answer. 6. Describes the GSM TDMA timeslot. 7. Contrast the GSM hyperframe, superframe, multiframe, and TDMA frame. 8. Provide the structure and use of normal burst and frequency correction burst. 9. What is the function of the GSM access burst? 10. What is the purpose of the GSM dedicated control channels? 11. How does the GSM mobile station know what paging group it belongs to? 12. State the reason behind the delay of three timeslot between uplink and downlink frame. 13. Why are there several types of GSM multiframes? 14. What basic functions are located within the connection management sublayer? 15. What is location updating? Explain the IMSI detach and attach location updating. 16. Explain the network switching system (NSS) of GSM network in detail. 17. Contrast the required bandwidth requirements of AMPS, GSM, and NA-TDMA. 18. Explain in detail the concept of GSM TDMA frame structure. 19. What are the two protocol stacks within the MSC node for a GSM system? 20. Show the steps of interrogation operation performed during call setup using a timeline diagram. 21. Explain the authentication operation of call setup using necessary diagram. 22. What is a GSM SIM card? What purpose does it serve? Multiple Choice Question 1. The Primary GSM 900 used to MHz uplink frequency band. a) b) c) d) The interface exists in GSM system that have separate units for the transcoder controller and base station controller. a) A Inteface b) Um Interface c) Abis Interface d) Ater Interface 3. In GSM cellular system each carrier frequency can be shared up to how many users? a) 2 b) 4 c) 8 d) The total number of channels for GSM 900 is. a) 2992 b) 992 c) 2392

7 Babu Madhav Institute of Information Technology, UTU : DSE6-Satellite and Telecommunication The MS is the device that provides the radio link between and. a) GSM subscriber and wireless mobile network b) MSC and BSC c) MSC and RBS 6. In the GSM standard, the MS consisting of which to elements a) mobile equipment and SIM card b) RBS and mobile equipment c) RBS and TRC 7. Which are the two elements of base station system (BSS)? a) a mobile station and a radio base station b) a radio base station and mobile switching centre c) a base transceiver system and the base station controller 8. An RBS in GSM cellular system is consisting of how many BTS that service a standard sectorized cell site? a) 2 b) 3 c) 4 d) 1 9. The is used by the GSM system to provide number portability to subscriber. a) visitor location register b) home location register c) flexible numbering register d) equipment identity register 10. Which of the following component provide surveillance of the entire network in GSM system. a) Operation and Support System b) Mobile Switching Centre c) Network Switching System 11. Which interface is exists between the BSC and BTS? a) A Inteface b) Um Interface c) Abis Interface d) Ater Interface Fill in the Blanks SAPAN NAIK 7

8 1. For GSM cellular system the air interface consists of channels that have a frequency separation of khz. 2. The GSM 1800 band has carrier frequencies. 3. In the GSM standard, the MS consisting of and. 4. The BSC and BTS communicate with each other using protocol in GSM cellular system. 5. The NSS will use to redirect messages sent by a GMSC toward a particular HLR to the correct HLR TDMA frame = Timeslots ms Hyperframe = Superframes = TDMA frames 8. The is used by GSM system to reduce the number of steps required for call setup. True/False 1. Hand over occurs when an inactive mobile station changes cells. 2. The GSM cellular system supports subscriber's roaming mobility through location updating operation only. Unit 3. CDMA Technology Short Questions 1. What does the term CDMA stands for? 2. What is the unique aspect of CDMA technology? 3. What ultimately limits the number of users of a CDMA cellular wireless system? 4. What are Walsh codes? 5. What is the difference between the CDMA soft handoff and the CDMA softer handoff? Long Questions 1. What is the function of the interworking function node in a 2G CDMA system? 2. What is the function of the mobile positioning system? 3. In a cdma2000 system, what is the function of the packet core network? What are its main components? 4. What is the function of the home agent in a cdma2000 system? 5. What is the function of the packet data serving node in a cdma2000 system? 6. Describe the generation of the IS-95 CDMA pilot channel. 7. Describe how the CDMA traffic channel is also able to provide power control information to the subscriber's mobile device. 8. Describe the use of power control groups on the CDMA reverse traffic channels. What purpose do they serve? 9. Describe the three states that a CDMA mobile may be in while in the attached mode. 10. Describe the steps a CDMA mobile goes through in the initialization state. 11. Describe the CDMA soft handoff. Unit 4. Introduction to satellite Communication Short Questions

9 Babu Madhav Institute of Information Technology, UTU : DSE6-Satellite and Telecommunication How satellite stays in orbit only and orbiting the earth? 2. Give one example of circular orbit. 3. Define the term altitude. 4. What is called to orbits with less than 90 degree of inclination? 5. For elliptical orbit, at which point satellite move faster and at which point satellite move slower? 6. What is the exact time required for earth to turn west to east in one day? 7. Define the term constellation. 8. Does size or mass of the satellite determine the period? Why? 9. What is the circumference of Clarke orbit? 10. What is Geosynchronous transfer orbit? 11. What is the equivalent degree E for Satellite at 39.5 degree W? 12. Give two advantages and disadvantages of GSO. 13. Where foci are located in circular orbit? 14. For Clarke orbit, 5 degree is equal to how many km? 15. What is to be called to longitude position of GSO satellite? 16. List out any four major subsystems of a communication satellite. 17. Which radio transmitter sends signals that earth station receive to accurately determine the satellite s position? Long Questions 1. List outs three Kepler s Laws and explain in detail. 2. Discuss the advantages and disadvantages of satellites in geostationary orbit for communication. 3. Write short note on Little and Big LEOs. 4. Explain orbit insertion or circularization or apogee firing procedure. 5. There is only one truly Geostationary orbit. Why? 6. Write the name of the orbit, which is 90 degree to Clarke orbit. How Molniya orbit is good alternative for Clarke orbit? 7. Give two disadvantages of Clarke orbit. How Geosynchronous transfer orbit is used to satellite in Clarke orbit? Multiple Choice Questions 1. If the eccentricity is exactly zero, it is special case of a. Elliptical orbit b. Circular orbit c. Rectangle orbit d. None of the above 2. To be truly geosynchronous, the satellite must lie km above the surface of the earth. a. 35,786 b. 42,164 c. 35,687 d. 42, What do you mean by HEO? a. High End Orbit b. Highly Elliptical Orbit c. Highly Effective Orbit SAPAN NAIK 9

10 d. Highest Effective Orbit True or False 1. Closed orbits have the shape of an ellipse, and the ellipse lies in a single plane. 2. Non geostationary orbits are internationally regulated. 3. LEO and MEO satellites will have shorter operational lives than GSO satellites. 4. All the satellites operating in a given service and frequency band use the same range of frequencies. 5. The period of the orbit depends only on the average distance of the satellite. 6. GSO satellite can see 20% of the entire surface of the planet. Unit 5. Satellite Systems, Construction and Satellite Operations Short Questions 1. By which method, one can identify approximate location of GSO? 2. Four spots along the GSO where all forces balance out. Give the name of these longitudes. 3. How to characterize transponder? 4. What do you mean by spot beam? 5. What do you mean by satellite neighborhood? 6. Write the satellite system name, which uses crosslink antennas. 7. In which structure, satellite looks like a tin can? 8. List out any four specification of communications payload. 9. Write any two advantages of solid-state power amplifiers. 10. Write any two functions of repeaters. 11. How ion thrusters work? Long Questions 1. Discuss the parameters on which types and functions of satellites depend. 2. Hybrid satellite adds to the difficulty of minimizing interference between satellites. Give your comments. 3. Which are the points need to keep in mind while putting satellite into orbit? 4. Explain satellite station keeping and orientation operations. 5. List and explain four characteristics of transponder. 6. Differentiate penetrating and non-penetrating antenna mounts. Multiple Choice Questions 1. Satellite is at degree E is equal to what degree W? a b c d LEO and MEO systems pass across the earth is. a. Satellite neighborhood b. Orbital spacing c. Orbital shaming d. Ground track 3. band use for broadcast services. a. Ka-band b. C-band c. Ku-band d. None of the above

11 Babu Madhav Institute of Information Technology, UTU : DSE6-Satellite and Telecommunication Smaller region of earth called a. Global beam b. Regional beam c. Stat beam d. All of the above 5. What is the full form of DARS? a. Digital audio radio from satellite b. Digital audio radio from system c. Data audio radio from satellite d. Digital atomic radio from satellite 6. TT&C stands for. (a) Tracking, Monitoring & Control (b) Tracking, Telemetry & Control (c) Telemetry, Tracking & Center (d) Timing, Tracking & Center 7. is used in repositioning satellite in another orbital slot. (a) Spot beam (b) Equator (c) RCS (d) Fuel 8. To control the satellite is to command the satellite to do what you want it to is known as. (a) delta-v (b) order wires (c) satellite control (d) orientation pointing Unit 6. Atmospheric Effects on Signals Short Questions 1. Give the name of atmospheric effect on signal caused because of difference in the density of air and its components. 2. What is faraday rotation? 3. Which kind of problem occurs during solar outage? 4. Extra amount of signal provided to overcome rain effect is called what? 5. What is scintillation? 6. List out two rain climate model. 7. What is Triple whammy situation? 8. Which are the three major cause of depolarization? 9. Define: Link Budget 10. State the formula which help to calculate link budget. Long Questions 1. Elevation angle and path length effect the signal strength Comment. 2. Explain link budget with an example. 3. What will be the effect of atmosphere on satellite communication? 4. Give any two major causes of depolarization. When signal not enter to dish directly from the satellite but may have bounced in after reflection from various objects of earth is called what? 5. Explain the process of calculating the amount of rain fade margin. SAPAN NAIK 1 1

12 6. How to improve the quality of degraded satellite link? Multiple Choice Questions 1. Water vapor is the major absorber between and above. (a) 20 and 30 GHZ, 40 GHZ (b) 10 and 40 GHZ, 80 GHZ (c) 45 and 65 GHZ, 60 GHZ (d) 30 and 60 GHZ, 20 GHZ 2. Which are the major causes of depolarization? (a) Raindrops (b) Ice crystals (c) Irregularities (d) All of above 3. Radio propagation engineers measure the amount of depolarization by a number called the. (a) Scintillation (b) Scattering (c) Cross-polarization discrimination (d) Polarization 4. Smaller satellites may have only a single. (a) Dish antenna (b) Horn antenna (c) Phased array antenna (d) Inter satellite link antenna. Fill in the Blanks. 1. Hail is water. 2. The water is comes in the form of and. 3. is the rapid changes in the electrons in the layer of the atmosphere called the. 4. The effects on a signal depend on the through the atmosphere. True or False. 1. At Ka-band the rain noise is much greater. 2. Sleet is another form of snow in the atmosphere. 3. Fog and clouds are of major effect only above about 10GHZ. 4. Path diversity is a sampling to improve the quality of a degraded satellite link. 5. Scattering is a process that not changes the direction of a wave. 6. The problem caused by the atmosphere is Faraday effect.