Description : An FDM hierarchy which is formed by frequency – division multiplexing 10 super groups together for a combined capacity of 600 voice band message channels.
Last Answer : Mastergroup
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 : 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 : 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 : 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 : 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 : Suppose a digitized voice channel is made by digitizing 8 kHz bandwidth analog voice signal. It is required to sample the signal at twice the highest frequency (two samples per hertz). What is the bit rate required, if it ... sample requires 8 bits? (A) 32 kbps (B) 64 kbps (C) 128 kbps (D) 256 kbps
Last Answer : (C) 128 kbps
Description : The total bandwidth of an NTSC TV signal is:
Last Answer : . 6 MHz
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
Last Answer : 6 MHz
Description : The bandwidth required for a modulated carrier depends on:
Last Answer : the baseband frequency range
Description : It is the ratio of the transmission bit rate to the minimum bandwidth required for a particular modulation scheme
Last Answer : Bandwidth efficiency, Information density, or Spectral efficiency
Description : It is the thermal noise power normalized to 1- Hz bandwidth:
Last Answer : noise power density
Description : For the 16-PSK and a transmission system with a 10kHz bandwidth, determine the maximum bit rate
Last Answer : 40,000 bps
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 : 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 : he local oscillator and mixer are combined in one device because:
Last Answer : it is cheaper
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 : Ten signals, each requiring 3000 Hz, are multiplexed on to a single channel using FDM. How much minimum bandwidth is required for the multiplexed channel ? Assume that the guard bands are 300 Hz wide. (A) 30,000 (B) 32,700 (C) 33,000 (D) None of the above
Last Answer : (B) 32,700
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 : What is the approximate bandwidth of an FM system with 10 kHz of modulating frequency and a 150 kHz of frequency deviation? A. 300 kHz B. 320 kHz C. 150 kHz D. 200 kHz
Last Answer : B. 320 kHz
Description : If the bandwidth of a signal is 5 KHz and thelowest frequency is 52 KHz, what is the highest frequency? A) 5 KHz B) 10 KHz C) 47 KHz D) 57 KHz
Last Answer : 57 KHz
Description : A tuned circuit has a Q of 100 at its resonant frequency of 500 kHz. Its bandwidth is _____kHz. (A) 50000 (B) 0.2 (C) 600 (D) 5
Last Answer : A tuned circuit has a Q of 100 at its resonant frequency of 500 kHz. Its bandwidth is 5 kHz.
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 : 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 : Assuming a UHF frequency range of 405.0125 MHz to 405.0875 MHz at 25 kHz channeling plan, how many channels can you produce? A. 2.5 ch. B. 2 ch. C. 4 ch. D. 3 ch.
Last Answer : D. 3 ch.
Description : ______ are special-interest groups that quickly test, evaluate, and standardize new technologies
Last Answer : Forums
Description : A ________ is normally a computer that operates in all five layers of the Internet model or seven layers of OSI model.
Last Answer : gateway
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
Description : When microwave energy is passed through a piece of ferrite in a magnetic field, another effect occurs. If the frequency of the microwave energy is much greater than the electron wobble frequency, the plane of polarization of the wavefront is rotated. This is known as
Last Answer : Faraday Rotation Effect
Description : The vertical field-scanning frequency is ______ Hz
Last Answer : 60
Description : In the Philippine color television system, the intercarrier frequency, in MHz, is
Last Answer : 4.5
Description : Which circuit is most common to both frequency-hopping and direct-sequence spread spectrum transmitters?
Last Answer : PSN code generator
Description : The result whenever the sampling rate is less than twice the highest audio frequency.
Last Answer : alias