InterviewSolution

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51.	To increase the capacity of AMPS, Motorola developed ____________(a) P-AMPS(b) N-AMPS(c) H-APMS(d) R-AMPSI got this question in a national level competition.The query is from AMPS and ETACS in section Wireless Systems and Standards of Wireless/Mobile
Answer» Right answer is (b) N-AMPS To explain: To increase capacity in large AMPS MARKETS, Motorola developed an AMPS LIKE system called N-AMPS (narrowband AMPS) in 1991. N-AMPS did not become WIDESPREAD as 2G digital technologies displaced MANY of the original FM analog systems.

52.	__________ is a third generation Personal Communication System.(a) PACS(b) AMPS(c) IS-95(d) GSMI had been asked this question in an internship interview.Query is from Digital European Cordless Telephone (DECT) in chapter Wireless Systems and Standards of Wireless/Mobile
Answer» RIGHT choice is (a) PACS The EXPLANATION: PACS (Personal Access Communication Systems) is a third GENERATION Personal Communication System. It was originally developed and proposed by BELLCORE in 1992.

53.	Which of the following burst is used to access service from any base station?(a) TCH(b) RACH(c) SCH(d) FCCHThe question was posed to me at a job interview.I'm obligated to ask this question of GSM Channel Types in chapter Wireless Systems and Standards of Wireless/Mobile
Answer» Right answer is (B) RACH To explain: Each user transmits a burst of data during the time slot assigned to it. The RACH burst is used by all MOBILES to ACCESS service from any BASE station, and dummy burst is used as filter information for UNUSED timeslots on forward link.

54.	CT2 is analog version of first generation cordless telephones.(a) True(b) FalseI have been asked this question during an internship interview.The above asked question is from CDMA Digital Cellular Standard (IS-95) in division Wireless Systems and Standards of Wireless/Mobile
Answer» The correct option is (b) False Explanation: CT2 is a digital version of the first generation, ANALOG, CORDLESS telephones. When COMPARED with analog cordless phones, CT2 OFFERS good speech quality and is more resistant to interference.

55.	________ supports the call completion facility in a multihandset environment.(a) Portable Handset(b) Network specific Interface Unit(c) Radio Fixed Part(d) Cordless controllerThis question was posed to me in an online quiz.The doubt is from Digital European Cordless Telephone (DECT) topic in chapter Wireless Systems and Standards of Wireless/Mobile
Answer» Correct choice is (b) NETWORK SPECIFIC INTERFACE Unit Explanation: Network specific Interface Unit supports the call completion facility in a multihandset environment. The interface recommended by the CCITT is the G.732 BASED on ISDN protocols.

56.	__________ is the main signalling layer of DECT.(a) Physical layer(b) Network layer(c) Data link layer(d) MAC layerThis question was addressed to me in class test.I'd like to ask this question from Digital European Cordless Telephone (DECT) in division Wireless Systems and Standards of Wireless/Mobile
Answer» Right option is (b) Network layer The best I can explain: The network layer is the main signalling layer of DECT. It is based on GSM and ISDN (layer 3) protocols. It PROVIDES call control and CIRCUIT SWITCHED services selected from one of the DLC services.

57.	CT2 was the first generation of cordless telephones.(a) True(b) FalseI have been asked this question in an interview for internship.This key question is from CDMA Digital Cellular Standard (IS-95) in chapter Wireless Systems and Standards of Wireless/Mobile
Answer» Correct option is (B) False The explanation is: CT2 was the second generation of cordless telephones introduced in Great Britain in 1989. It is USED to provide telepoint services which ALLOW a subscriber to USE CT2 HANDSETS at a public telepoint.

58.	USDC forward and reverse control channels use exactly the same signalling techniques as AMPS.(a) True(b) FalseI have been asked this question during an online exam.The question is from United States Digital Cellular (IS-54 and IS-136) in chapter Wireless Systems and Standards of Wireless/Mobile
Answer» Right choice is (a) True Explanation: To MAINTAIN COMPATIBILITY with AMPS phones, USDC forward and reverse control channels USE exactly the same signalling techniques as AMPS. USDC VOICE channels use 4-ary π/4 DQPSK MODULATION with a channel rate of 48.6 kbps.

59.	IS-95 uses same modulation technique for forward and reverse channel.(a) True(b) FalseThis question was posed to me in semester exam.Origin of the question is CDMA Digital Cellular Standard (IS-95) topic in division Wireless Systems and Standards of Wireless/Mobile
Answer» Correct option is (b) False To explain I would SAY: IS-95 uses different modulation and spreading technique for the forward and reverse LINKS. On the forward link, the BASE station simultaneously transmits the user DATA for all mobiles in the cell by using different spreading sequence for each mobile.

60.	Which of the following channel in USDC is used to send important control or specialized traffic data between the base station and mobile units?(a) DTC(b) CVDCC(c) SACCH(d) FACCHI have been asked this question in an interview for internship.My question comes from United States Digital Cellular (IS-54 and IS-136) in division Wireless Systems and Standards of Wireless/Mobile
Answer» The correct answer is (d) FACCH To EXPLAIN I would say: FACCH (fast associated control channel) is used to send IMPORTANT control or specialized traffic data between the BASE station and mobile units. The FACCH data, when transmitted, TAKES the PLACE of user information data within a frame.

61.	Which of the following channel is similar in functionality to the SAT used in AMPS?(a) DTC(b) CDVCC(c) SACCH(d) FACCHThe question was asked during an interview.The origin of the question is United States Digital Cellular (IS-54 and IS-136) in division Wireless Systems and Standards of Wireless/Mobile
Answer» Right ANSWER is (b) CDVCC Explanation: CDVCC (Code Digital Verification Color Code) is a 12 bit message sent in EVERY time slot and is similar in functionality to the SAT used in AMPS. The CDVCC is an 8 bit number RANGING between 1 and 255, which is protected with four additional channel coding bits from a shortened Hamming code.

62.	IS-95 was not compatible with existing AMPS frequency band.(a) True(b) FalseI have been asked this question during an interview.Question is from CDMA Digital Cellular Standard (IS-95) in chapter Wireless Systems and Standards of Wireless/Mobile
Answer» Correct ANSWER is (b) False The explanation is: Like IS-136, IS-95 system was designed to be compatible with the existing US analog cellular system (AMPS) frequency BAND. Hence, mobile and base stations can be ECONOMICALLY produced for DUAL mode operation.

63.	Who developed the first US cellular telephone system called AMPS?(a) Motorola(b) Ericsson(c) AT & T Bell Laboratories(d) ETSIThis question was addressed to me in unit test.My question comes from AMPS and ETACS topic in portion Wireless Systems and Standards of Wireless/Mobile
Answer» The correct answer is (c) AT & T BELL Laboratories Best explanation: In the late 1970S, AT & T Bell Laboratories developed the first US cellular telephone system CALLED the Advanced Mobile Phone System (AMPS). In 1983, a total of 40 MHz of spectrum in the 800 MHz band was located by the Federal Communication COMMISSION for AMPS.

64.	The dual mode USDC/AMPS system was standardized as ____________(a) IS-54(b) IS-136(c) PSTN(d) GSMThe question was asked at a job interview.The above asked question is from United States Digital Cellular (IS-54 and IS-136) topic in section Wireless Systems and Standards of Wireless/Mobile
Answer» Right choice is (a) IS-54 To explain I would say: The dual mode USDC/AMPS SYSTEM was standardized as INTERIM Standard 54 (IS 54). It was standardized by Electron Industries Association and Telecommunication Industry Association (EIA/TIA) in 1990. It was LATER upgraded to IS-136.

65.	Which of the following feature makes impossible to eavesdrop on GSM radio transmission?(a) SIM(b) On the air privacy(c) SMS(d) Packet switched trafficThis question was posed to me during an online exam.Origin of the question is Global System for Mobile (GSM) in portion Wireless Systems and Standards of Wireless/Mobile
Answer» Correct answer is (b) On the air privacy To elaborate: The on the air privacy feature of GSM makes impossible to eavesdrop on a GSM RADIO TRANSMISSION. The privacy is made possible by encrypting the digital bit stream sent by a GSM TRANSMITTER, ACCORDING to a specific secret cryptographic key that is known only to the cellular carrier.