Description : 1000Base-SX, 1000Base-LX, and 1000Base-CX use _________ block coding and ________ line coding. A) 4B/5B; NRZ B) 8B/10B; NRZ C) 4B/5B; MLT-3 D) 8B/10B; NRZ
Last Answer : 8B/10B; NRZ
Description : The transformer signal coding method for T1 carrier is A. Binary B. NRZ C. Manchester D. Bipolar
Last Answer : D. Bipolar
Description : The transmission signal coding method of TI carrier is called a. Bipolar b. NRZ c. Manchester d. Binary
Last Answer : Bipolar
Description : 100Base-T4 uses________line coding. A) NRZ B) 8B6T C) MLT-3 D) Manchester
Last Answer : 8B6T
Description : 100Base-FX uses_________ block coding and ________ linecoding. A) 4B/5B; NRZ-I B) 8B/10B; NRZ C) 4B/5B; MLT-3 D) 8B/10B; NRZ
Last Answer : 4B/5B; NRZ-I
Description : 100Base-TX uses_________ block coding and ________ linecoding. A) 4B/5B; NRZ B) 8B/10B; NRZ C) 4B/5B; MLT-3 D) 8B/10B; NRZ
Last Answer : 4B/5B; MLT-3
Description : In NRZ code, does the presence of a high-light level in the bit duration represent a binary 1 or a binary 0?
Last Answer : Binary 1.
Description : What are the four widely used variations of the NRZ encoding method?
Last Answer : a. Non-return-to-zero level (NRZ-L). b. Enhanced non-return-to-zero level (E-NRZ-L). c. Non-return-to-zero mark (NRZ-M). d. Non-return-to-zero space (NRZ-S).
Description : How is a binary 1 encoded in RZ line coding?
Last Answer : A half-period optical pulse present in the first half of the bit duration.
Description : Unipolar, bipolar, and polar encoding are typesof _______ encoding. A) line B) block C) NRZ D) Manchester
Last Answer : line
Description : Which of the basic timing circuits produces sharp trigger pulses directly?
Last Answer : Blocking oscillators.
Description : A self-synchronized radar system obtains timing trigger pulses from what source?
Last Answer : Transmitter.
Description : What radar subsystem supplies timing signals to coordinate the operation of the complete system?
Last Answer : Synchronizer.
Description : Why is it important to minimize TBE jitter in magnetic tape recordings where precise timing relationships exist between two or more signals?
Last Answer : The jitter could cause noise and a loss of accuracy.
Description : How do we refer to errors caused by faulty logic and coding mistakes?
Last Answer : Bugs.
Description : Standard Ethernet (10-Mbps) uses_______ encoding A) NRZ B) AMI C) Manchester D) differential Manchester
Last Answer : Manchester
Description : The minimum bandwidth of Manchester and differential Manchester is ____that of NRZ. A) the sameas B) twice C) thrice D) none of the above
Last Answer : twice
Description : The idea of RZ andthe ideaof NRZ-I are combined into the ________ scheme. A) Manchester B) differential Manchester C) both (a) and (b) D) neither (a) nor (b)
Last Answer : differential Manchester
Description : The idea of RZ andthe ideaof NRZ-L are combined into the ________ scheme. A) Manchester B) differential Manchester C) both (a) and (b) D) neither (a) nor (b)
Description : In______, the changeor lackof change in the level of the voltagedetermines the value of the bit. A) NRZ-I B) NRZ-L C) both (a)and (b) D) neither (a) nor (b)
Last Answer : NRZ-I
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 : Two common scramblingtechniques are ________. A) NRZ and RZ B) AMI and NRZ C) B8ZS and HDB3 D) Manchester and differential Manchester
Last Answer : B8ZS and HDB3
Description : Which encoding method uses alternating positive and negative values for1s? A) NRZ-I B) RZ C) Manchester D) AMI
Last Answer : AMI
Description : Which of the following encoding methods does not provide for synchronization? A) NRZ-L B) RZ C) NRZ-I D) Manchester
Description : FITL stands for: a. Fiber In The Loop b. Fiber Input Timing Loss c. Frequency Input to The Loop d. Fiber Input Timing Loop
Last Answer : a. Fiber In The Loop
Description : All the following statements about restriction fragment length polymorphism are true except (A) It results from mutations in restriction sites (B) Mutations in restriction sites can occur in coding or non- ... It is inherited in Mendelian fashion (D) It can be used to diagnose any genetic disease
Last Answer : Answer : D
Description : At what point on an open-circuited rf line do voltage peaks occur?
Last Answer : At 1/2 wavelength from the end and at every 1/2 wavelength along the line
Description : In ________, we combine signals from different sources to fit into a larger bandwidth. A) spread spectrum B) line coding C) block coding D) none of the above
Last Answer : spread spectrum
Description : ______ provides synchronization without increasingthe number of bits. A) Scrambling B) Line coding C) Block coding D) None of the above
Last Answer : Scrambling
Description : _______ isnormally referred toas mB/nB coding; it replaceseach m-bit group with an n-bit group. A) Block coding B) Line coding C) Scrambling
Last Answer : Block coding
Description : _____ provides redundancy toensure synchronization and inherent errordetection. A) Block coding B) Line coding C) Scrambling D) None of the above
Description : ________ is the process of converting digitaldata to adigital signal. A) Block coding B) Line coding C) Scrambling D) None of the above
Last Answer : Line coding
Description : __________ conversion involves three techniques: line coding,block coding, and scrambling. A) Analog-to-digital B) Digital-to-analog C) Analog-to-analog D) Digital-to-digital
Last Answer : Digital-to-digital
Description : The physical layer is responsible for _____ a) line coding b) channel coding c) modulation d) all of the mentioned
Last Answer : d) all of the mentioned
Description : What condition must occur to have a change in the output of a D FF?
Last Answer : A positive-going clock pulse.
Description : In what layer of the atmosphere does virtually all weather phenomena occur?
Last Answer : Troposphere.
Description : Where does the greatest amount of ionospheric absorption occur in the ionosphere?
Last Answer : Where ionization density is greatest.
Description : . What causes ionization to occur in the ionosphere?
Last Answer : High energy ultraviolet light waves from the sun.
Description : List the three basic errors that occur during fiber alignment.
Last Answer : Fiber separation (longitudinal misalignment), lateral misalignment, and angular misalignment.
Description : Light propagates in multimode graded-index fibers according to refraction and total internal reflection. When does total internal reflection occur?
Last Answer : When the angle of incidence becomes larger than the critical angle of incidence.
Description : When does most printed circuit board damage occur?
Last Answer : During disassembly or repair.
Description : What relationship must exist between the electron beam and the traveling wave for bunching to occur in the electron beam of a twt?
Last Answer : The traveling wave must have a forward velocity equal to or less than the speed of the electrons in the beam.
Description : Your activity stores its magnetic tape in an area where the temperature is 100º F. What two types of environmental damage could occur that would make these tapes unusable?
Last Answer : Head-to-tape sticking and layer-to-layer adhesion
Description : What six types of environmental damage can occur to tapes in storage when the ideal temperature and humidity ranges are exceeded?
Last Answer : Tape deformation, oxide shedding, head-to-tape sticking, layer to-layer sticking, dirt build-up, and excessive tape and head wear.
Description : Environmental damage to magnetic tape can occur when the tape is stored in an area that exceeds what ideal temperature and humidity ranges?
Last Answer : Ideally, use and store tape at 60 to 80º F and at 40 to 60% relative humidity.
Description : If magnetic tape is stored in areas with temperature and humidity extremes, what are three types of tape damage that may occur?
Last Answer : Oxide shedding, layer-to-layer sticking, and tape deformation.
Description : Delay differences between the source wavelengths occur as the optical signal propagates along the fiber. What is this called?
Last Answer : Differential group delay t(l).
Description : Where does the major lobe in the end-fire array occur?
Last Answer : Along the major axis
Description : Wrong timing?
Last Answer : Is he married?