Question : Choose the best answer in each question. 1. IS-95 uses thesatellite system for synchronization. .C) Teledesic . A) ridium .B) GPS D) none of the above 2. satellites can provide direct universal voice and data communications for handheld terminals. . A) Teledesic .B) GPS .C) .D) Iridium none of the above 3. is a second-generation cellular phone system based on CDMA and DSSS .A) IS-95 .B) D-AMPS .C) .D) GSM none of the above 4. GSM allows a reuse factor of 5. In the third generation of cellular phones, uses CDMA2000. . A) IMT-MC .B) IMT-TC .C) IMT-SC .D) IMT-DS 6. Iridium satellites aresatellites. .A) MEO .B) LEO .C) GEO .D) none of the above 7. In an IS-95 system, the frequency-reuse factor is normally 8. is a second-generation cellular phone system used in Europe. .A) IS-95 .B) GSM . C) D-AMPS .D) none of the above 9. A GEO is at the orbit and revolves in phase with Earth. .A) inclined . B) polar .C) .D) equatorial none of the above 10.is a first-generation cellular phone system. .A) GSM .B) AMPS .C) .D) D-AMPS none of the above is a digital version of AMPS. .A) GSM .B) IS-95 .C) .D) D-AMPS none of the above uses TDMA. .C) IMT-MC D) IMT-DS 12. In the third generation of cellular phones, A) IMT-TC .B) IMT-SC 13. In a same time handoff, a mobile station can communicate with two base stations at the .A) soft .B) hard C) medium .D) none of the above 14. IS-95 uses the ISM .A) 800-MHz .B) 900-MHz .C) 1900-MHz . D) either (a) or (c) 15.satellites provide time and location information for vehicles and ships. . A) Teledesic . B) GPS C) Iridium D) none of the above 16. There is (are) orbit(s) for a GEO satellite. .A) two .B) one .C) many D) none of the above 17, GPS satellites are satellites. .A) MEO .B) LEO .C) GEO D) none of the above 18. The period of a satellite, the time required for a satellite to make a complete trip around the Earth, is determined by law .A) Ohm's .B) Newton's .C) Keplers D) none of the above 19. LEO satellites are normally below an altitude of km .A) 3000 .B) 2000 .C) 1000 .D) none of the above 20.is a second-generation cellular phone system. .A) GSM .B) AMPS .C) .D) D-AMPS none of the above 21, In AMPS, each band is divided into channels. .A) 1000 . C) 800 . D) none of the above ) 900 22. In the third generation of cellular phones,uses W-CDMA .A) IMT-TC .B) IMT-DS .C) IMT-SC .D) IMT-MC 23. In a handoff, a mobile station only communicates with one base station . A) soft .B) medium .C) hard D) none of the above 24. AMPS uses to divide each 25-MHz band into channels. .A) TDMA .B) FDMA .C) CDMA .D) none of the above 25.is based on a principle called trilateration. .A) Iridium .B) Teledesic .C) GPS .D) none of the above satellites will provide universal broadband Internet access. . A) Teledesic . B) GPS .C) .D) Iridium none of the above 27. Thecellular phone system will provide universal personal communication. .C) first-generation .D) none of the above .B) third-generation 28. AMPS has a frequency reuse factor of . B) 5 29. AMPS operates in the ISM band. .A) 1800-MHz B) 900-MHz .C) .D) 800-MHz none of the above 30. Low-Earth-orbit (LEO) satellites have .A) polar .B inclined .C) .D) equatorial none of the above 31. The signal from a satellite is normally aimed at a specific area called the . C) path . D) none of the above .A) effect B) footprint 32.is an analog cellular phone system using FDMA. .A) GSM .B) AMPS .C) .D) D-AMPS none of the above 33, Teledesic satellites are satellites. .A) MEO .B) LEO .C) .D) GEO none of the above 34. GSM is a digital cellular phone system using .A) FDMA .B) CDMA .C) TDMA D) both (a) and (c) 35. In the third generation of cellular phones,uses a combination of W-CDMA and TDMA .A) IMT-TC .B) IMT-SC * C) IMT-DS D) IMT-MC 36, MEO satellites are located at altitudes between km. .A) 5000 and 10,000 .B) 5000 and 15,000 .C) .D) 3000 and 5000 none of the above 37. IS-95 is based on .C) CDMA .A) DSSS .B) FDMA D) all of the above 38. D-AMPS uses to divide each 25-MHz band into channels. .A) FDMA .B) CDMA .C) TDMA .D) both (a) and (c) 39. Teledesic satellites orbits at an altitude of A) 750KM B) 1350 KM .C) 3600 KM .D) None of the above 40. According to satellite signals how many satellites are there in geosynchronous orbit? A) 20 .) 60 .C) 402 .D) 1500 Question 2: What is HDLC? Sketch the THREE types of HDLC Frames(fields) and their control field format respectively Question 3: What do you mean by PPP? Briefly write about the SIX transition phases of PPP protocol. Transition phases: 5. 6. Question 4: Distinguish between the PPP authentication protocols PAP and CHAP PAP CHAP