Description : An FDM hierarchy which is formed by frequency – division multiplexing five groups containing 12 channels each for a combined bandwidth of 240 kHz
Last Answer : Supergroup
Description : FDM telephone systems accommodate many channels by:
Last Answer : Using multiple levels of multiplexing
Description : Which of the following is oldest multiplexing scheme? A. Frequency Division Multiplexing (FDM) B. Time Division Multiplexing (TDM) C. Code Division Multiplexing (CDM) D. Space Division Multiplexing (SDM)
Last Answer : D. Space Division Multiplexing (SDM)
Description : A good example of a pilot tone system used in commercial frequency modulation stations. A. FDM B. Time division C. Stereo multiplexing D. Frequency modulation
Last Answer : C. Stereo multiplexing
Description : FDM stands for: a) Frequency Division Multiplexing b) Fidelty Division Multiplexing c) Fast Division Multiplexing d) None of These
Last Answer : a) Frequency Division Multiplexing
Description : One of the reasons why FDM is being replaced by TDM is A. noise is amplified with voice when an FDM system is used B. it is difficult to place channels side by side C. there is more time than frequency D. Most available frequencies has been used
Last Answer : A. noise is amplified with voice when an FDM system is used
Description : A single fiber can handle as many voice channels as.
Last Answer : a 1500-pair cable The term power budgeting refers to: Ans. the total power available minus the attenuation losses
Description : Given the following statements: (a) Frequency Division Multiplexing is a technique that can be applied when the bandwidth of a link is greater than combined bandwidth of signals to be transmitted. (b) Wavelength Division Multiplexing (WDM) ... c) is true. (D) (a), (b) and (d) are true; (c) is false.
Last Answer : (D) (a), (b) and (d) are true; (c) is false.
Description : How many voice band channels are there in a superjumbo group? A. 600 B. 900 C. 10,800 D. 3,600
Last Answer : C. 10,800
Description : How do you transmit through multiplexing, a thousand of voice channel information over a single fiber optic using on e wavelength? A. Polar division B. Time division C. Fiber division D. Frequency division
Last Answer : B. Time division
Description : Which multiplexing technique shifts each signal to a different carrier frequency? A) FDM B) TDM C) Both (a)and (b) D) None of the above
Last Answer : FDM
Description : Which of the following is not a typical FDM application?
Last Answer : Secure communications
Description : In SPADE system, how many PCM-encoded voice band channels are there? A. 800 B. 600 C. 300 D. 240
Last Answer : A. 800
Description : ECE Board Exam March 1996 The number of voice band channels in master group per CCITT standard is __________. A. 300 B. 480 C. 600 D. 12
Last Answer : A. 300
Description : In communication systems the frequency range used for voice is:
Last Answer : 300 Hz to 3800 Hz
Description : Multiplexing scheme use by baseband transmission. A. FDM B. Space multiplexing C. TDM D. Statistical multiplexing
Last Answer : C. TDM
Description : _____ isa digital multiplexing technique for combiningseveral low-ratechannels into onehigh-rate one. A) FDM B) TDM C) WDM D) None of the above
Last Answer : TDM
Description : _____ isan analog multiplexing technique to combine optical signals. A) FDM B) TDM C) WDM D) None of the above
Last Answer : WDM
Description : Which multiplexing technique involves signals composed of light beams? A) FDM B) TDM C) WDM D) none of the above
Description : Which multiplexing technique transmits digital signals? A) FDM B) TDM C) WDM D) None of the above
Description : Which multiplexing technique transmits analog signals? A) FDM B) TDM C) WDM D) (a) and (c)
Last Answer : (a) and (c)
Description : Time synchronization is necessary in (A) FDM. (B) TDM. (C) WDM. (D) Quadrature multiplexing
Last Answer : (B) TDM.
Description : he local oscillator and mixer are combined in one device because:
Last Answer : it is cheaper
Description : Classification of protocol that interprets a frame of data as a group of successive bit combined into predetermined pattern of fixed length, usually 8 bits each.
Last Answer : Character and Byte-oriented protocols
Description : What is the baseband frequency of standard FDM basic supergroup? A. 312 to 552 kHz B. 300 to 600 kHz C. 60 to 2540 kHz D. 60 to 108 kHz
Last Answer : A. 312 to 552 kHz
Description : It is proposed network designed by major telephone companies in conjunction with the ITU-T with the intent of providing worldwide telecommunications support for voice, data, video and facsimile information within the same networ
Last Answer : ISDN
Description : The most common method used for sampling voice signals in PCM systems.
Last Answer : flat top sampling
Description : Describe North American (T-carrier) digital multiplexing hierarchy with neat diagram.
Last Answer : Explanation:- T1 Carrier System T1 carrier systems were designed to combine PCM and TDM Techniques for the Transmission of 24 64Kbps channels with each channel Capable of Carrying ... 8064 64Kbps voice or data channels and transmit them at 560.16Mbps over a single coaxial cable.
Description : ____ system transmits frequency-division-multiplexed voice band signals over a coaxial cable for distances up to 4000 miles. A. T carrier B. X carrier C. L carrier D. F carrier
Last Answer : C. L carrier
Description : Used for time division multiplexing. A. Frequency modulation B. Pulsed modulation C. SSB D. Amplitude modulation
Last Answer : B. Pulsed modulation
Description : Mostly ________ is used in wireless LAN. a) time division multiplexing b) orthogonal frequency division multiplexing c) space division multiplexing d) channel division multiplexing
Last Answer : b) orthogonal frequency division multiplexing
Description : Used for transmission of PCM encoded time – division multiplexed digital signal.
Last Answer : T carriers
Description : It is used to encode the minimum amount of speech information necessary to reproduce a perceptible message with a fewer bits that those needed by a conventional encoder/decoder
Last Answer : vocoders
Description : The characters making up the message in a synchronous transmission are collectively referred to as the data
Last Answer : block
Description : Packets which is self – contained and travels through the network independent of other packets of the same message by whatever means available
Last Answer : Datagram
Description : A(n) ________function creates a message digest out of a message.
Last Answer : hash
Description : Message _______ means that the receiver is ensured that the message is coming from the intended sender, not an imposter
Last Answer : authentication
Description : ______ are special-interest groups that quickly test, evaluate, and standardize new technologies
Last Answer : Forums
Description : The upper pulse rate and information carrying capacity of a cable is limited by:
Last Answer : modal dispersion
Description : Sixteen different levels (symbols) are used to encode binary data. The channel bandwidth is 36 MHz. The maximum channel capacity is
Last Answer : 288 Mbps
Description : What is the type of mastergroup used for low – capacity microwave systems?
Last Answer : L600
Description : What carrier system multiplexes 96 voice band channels into a single 6.312 Mbps data signal? A. T1 carrier system B. T2 carrier system C. T1C carrier system D. T3 carrier system
Last Answer : B. T2 carrier system
Description : How many telegraph channels are there in the basic voice band channels? A. 24 B. 96 C. 48 D. 672
Last Answer : A. 24
Description : Which of the following types of channels moves data relatively slowly? a. wide band channel b. voice band challen c. narrow band channel
Last Answer : narrow band channel
Description : What are the datatransmission channels availablefor carrying datafrom one location to another? A. Narrowband B. Voice band C. Broadband D. All of theabove E. None of the above
Last Answer : All of theabove
Description : Which of the following types of channels moves data relatively slowly? A. widebandchannel B. voice band channel C. narrowband channel D. broadbandchannel E. None of the above
Last Answer : narrowband channel
Description : A special type of transmission line that consist of conducting metallic tube through which high frequency electromagnetic energy is propagated
Last Answer : waveguide
Description : In a waveguide, what is a frequency that would cause angles of incidence and reflection to be zero degrees?
Last Answer : Critical Frequency
Description : At what frequency compared to the cutoff frequency of a waveguide will the wavefronts be reflected back and forth across the guide (setting up standing waves) and no energy
Last Answer : UHF receiving antenna
Description : In changing the frequency of a cavity, what is accomplished by placing a nonmagnetic slug in the area of maximum H lines
Last Answer : Inductive Coupling