Description : In_____, each station transmits its data in itsassignedtime slot. A) FDMA B) TDMA C) CDMA D) none of the above
Last Answer : TDMA
Description : In______, each station is allocated a band to send its data. In other words, each band is reservedfor a specific station,and it belongs to the station all the time. A) FDMA B) TDMA C) CDMA D) none of the above
Last Answer : FDMA
Description : In_______, the stations share thebandwidth of the channel in time. A) FDMA B) TDMA C) CDMA D) none of the above
Description : The access method in Bluetooth is________. A) FDMA B) TDD-TDMA C) CDMA D) none of the above
Last Answer : TDD-TDMA
Description : In_______, the sequences aregenerated using orthogonal codes such the Walsh tables. A) FDMA B) TDMA C) CDMA D) none of the above
Last Answer : CDMA
Description : ______ is based oncoding theory and uses sequencesof numbers called chips. A) FDMA B) TDMA C) CDMA D) none of the above
Description : In ______, the stations usedifferent codes toachieve multipleaccess. A) FDMA B) TDMA C) CDMA D) none of the above
Description : In________, the available bandwidth is divided into frequency bands. A) FDMA B) TDMA C) CDMA D) none of the above
Description : ________ requires that each station first listento the medium before sending. A) MA B) CSMA C) FDMA D) CDMA
Last Answer : CSMA
Description : A method of multiple accessing where a given RF channel bandwidth is divided inot smaller frequency band. A. CDMA B. ANIK-D C. TDMA D. FDMA
Last Answer : D. FDMA
Description : A multiple access technique used in GSM cellular system A. TACS B. FDMA C. TDMA D. CDMA
Last Answer : C. TDMA
Description : Which of the following multiple access techniques are used by second generation cellular systems? a) FDMA/FDD and TDMA/FDD c c) FDMA/FDD and CDMA/FDD d) FDMA/FDD only
Last Answer : b) TDMA/FDD and CDMA/FDD
Description : UMTS use which multiple access technique? a) CDMA b) TDMA c) FDMA d) SDMA
Last Answer : a) CDMA
Description : In ______, the chanceof collisioncan be reduced if a station senses the medium beforetrying touse it. A) MA B) CSMA C) FDMA D) CDMA
Description : State advantages of TDMA over FDMA
Last Answer : 1. In TDMA since only one station is present at any given time so the crosstalk will avoided this is present in FDMA. 2. The entire channel band which can be allocated to signal channel at ... secure than FDMA. 8. Intermodulation products are absent as there is one carrier only in all time slots.
Description : Suppose there are n stations in a slotted LAN. Each station attempts to transmit with a probability P in each time slot. The probability that only one station transmits in a given slot is _______. a. nP(1 – P)n – 1 b. nP c. P(1 – P)n – 1 d. n P (1 – P)n – 1
Last Answer : a. nP(1 – P)n – 1
Description : Compare TDMA and CDMA on the basis of sharing of time and B.W. Synchronization, code word ,guard band and guard time.
Last Answer : Sr. No Parameters TDMA CDMA 1 Sharing of time & B.W Sharing of time of satellite Transponder using entire BW Sharing of time and bandwidth both. 2 ... guard times and guard bands are required if it uses along with TDMA & FDMA. Otherwise not required.
Description : Distinguish between TDMA and CDMA
Last Answer : Sr. No. Parameter TDMA CDMA 1 Definition Entire bandwidth is shared among different subscribers at Fixed predetermined or dynamically assigned time intervals/slots. Entire bandwidth is ... phone, system(AMPS), Cordless telephone IS95 Wide band, CDMA 2000,2.5G and 3G
Description : In__________, eachstation is forced to send only at the beginning of the time slot. A) pure ALOHA B) slotted ALOHA C) both (a) and (b) D) neither (a) nor (b)
Last Answer : slotted ALOHA
Description : In_____ transmission, thecarrier signal is modulated so that its amplitude varies with the changing amplitudes of the modulating signal. A) AM B) PM C) FM D) none of the above
Last Answer : AM
Description : In_____ transmission, thephaseof the carrier signal is modulated to follow the changingvoltage level (amplitude) of the modulating signal. A) AM B) PM C) FM D) none of the above
Last Answer : PM
Description : In_____ transmission, the frequency of the carrier signal is modulated to follow the changing voltage level (amplitude)of the modulating signal. The peak amplitude and phase of the carrier signal remainconstant,but as ... of thecarrier changes correspondingly. A) AM B) PM C) FM D) none of the above
Last Answer : FM
Description : In_____, the level of the voltagedetermines the valueof the bit. A) NRZ-I B) NRZ-L C) both (a) and (b) D) neither (a) nor (b)
Last Answer : NRZ-L
Description : Bluetooth uses ______method in thephysical layer to avoid interference from other devicesor othernetworks. A) DSSS B) FHSS C) FDMA D) none of the above
Last Answer : FHSS
Description : Satellite-Switched Time-Division Multiple Access (SS/TDMA) is A. the method of determining whichdevice has access tothe transmission medium at any time. B. a medium access control technique for ... switching is used to dynamically changethechannel assignments D. All of theabove E. None of the above
Last Answer : a form of TDMA in which circuit switching is used to dynamically changethechannel assignments
Description : If link transmits 4000 frames per second and each slot has 8 bits, the transmission rate of circuit of this TDM is ______. a. 64 Kbps b. 32 Mbps c. 32 Kbps d. 64 MbpS
Last Answer : c. 32 Kbps
Description : W-CDMA requires a complete change of RF equipment at each base station. a) True b) False
Last Answer : a) True
Description : Suppose there are n stations in a slotted LAN. Each station attempts to transmit with a probability P in each time slot. The probability that only one station transmits in a given slot is .................. (1) nP(1-P)n-1 (2) nP (3) P(1-P)n-1 (4) nP(1-P)n-1
Last Answer : nP(1-P)n-1
Description : In _______ methods, the stations consult one another tofind which station has the right to send. A) random access B) controlledaccess C) channelization D) none of the above
Last Answer : controlledaccess
Description : When does the station B send a positive acknowledgement (ACK) to station A in Stop and Wait protocol? a. only when no error occurs at the transmission level b. when retransmission of old packet in a novel frame is necessary c. only when station B receives frame with errors d. all of the above
Last Answer : only when no error occurs at the transmission level
Description : . If there is only one station with a packet to send, this guarantees that there will ………….. For that packet. A. never be a collision B. be a collision C. be an improvement D. direction
Last Answer : A. never be a collision
Description : Using_________each connected device is assigned a time slot whether or not the device has any thing to send. (A) WDM (B) FDM (C) TDM (D) STDM
Last Answer : (C) TDM
Description : The term 'duplex' refers to theability of the data receiving stations toecho back aconfirming messageto the sender. Infull duplex data transmission, both the sender and the receiver A. cannot talk at once B. can ... data one ata time D. can do one way data transmission only E. None of the above
Last Answer : can do one way data transmission only
Description : When internet data leaves your campus, it normallygoes toa(n) ______ before moving towardits destination. A) Internet backbone B) Networkaccesspoint C) Base station D) Communication system
Last Answer : Networkaccesspoint
Description : What is the minimum number of wires needed to send data over a serial communication link layer? a. 1 b. 2 c. 4 d. 6 e. none of above
Last Answer : 2
Description : A _________ sine wave is not useful in data communications; we need to send a _______signal. A) composite; single-frequency B) single-frequency; composite C) single-frequency;double-frequency D) none of the above
Last Answer : single-frequency; composite
Description : A device is sending out data at the rate of 2000 bps. How long does it take to send a file of 1,00,000 characters ? a. 50 b. 200 c. 400 d. 800
Last Answer : c. 400
Description : In the _______ method, each station has a predecessorand a successor. A) reservation B) polling C) token passing D) none of the above
Last Answer : token passing
Description : Each station on an Ethernet network has a unique _______ address imprinted onits network interface card (NIC). A) 5-byte B) 32-bit C) 48-bit D) none of the above
Last Answer : 48-b
Description : The Federal Communications Commission (FCC) allows ______ kHz for each FM station. A) 20 B) 100 C) 200 D) none of the above
Last Answer : 100
Description : The Federal Communications Commission (FCC) allows ______kHz for each AM station. A) 5 B) 10 C) 20 D) none of the above
Last Answer : 0
Description : Consider different activities related to email: m1: Send an email from a mail client to a mail server m2: Download an email from mailbox server to a mail client m3: Checking email in a web browser Which is the application ... FTP m3: HTTP c. m1: SMTP m2: POP m3: HTTP d. m1: POP m2: SMTP m3: IMAP
Last Answer : c. m1: SMTP m2: POP m3: HTTP
Description : The decisive battle was fought between Raja Dahir and Mohammad Bin Qasim in_____. A. 28th Oct. 712 B. 29th Oct. 712 C. 30th Oct. 712 D. 31st Oct. 712
Last Answer : ANSWER: A
Description : Plants grown in acidic soil are deficient in_____ a. Calcium and Manganese b. Magnesium and Calcium c. Iron and Manganese d. Aluminium and Iron
Last Answer : b. Magnesium and Calcium
Description : How are the growth of SSI technology in_____: a. 1956 on words b. 1965 on words c. 1978 on words d. 1978 on words
Last Answer : b. 1965 on words