Test questions (red are incorrect answers)

  1. What is transmission in telecommunication? CHOICE
  2. act of transmitting electrical messages
  3. act of transmitting digital waves
  4. act of transmitting voice waves
  5. What is Message in telecommunication? ORDER
  6. Messages can be a series of data units, such as binary digits, or groups of those, variously called frames, blocks.
  7. How can we split Transmission into two parts? GAP MATCH
  8. The dispatching by a sender, of a signal, message, or any form of information for receptient.
  9. The propagation of a signal via any medium.
  10. List signal means CHOICE MULTIPLE
  11. telegraph,
  12. telephone,
  13. radio,
  14. television,
  15. telefacsimile
  16. voice
  17. digital
  18. microwave
  19. List medium types CHOICE MULTIPLE
  20. wire,
  21. coaxial cable,
  22. microwave,
  23. optical fiber,
  24. radio frequency
  25. air
  26. copper
  27. analog
  28. How can be Transmisson divided depending of the nature of sended message format. TEXT ENTRY
  29. analog
  30. digital
  31. What is Analog signal? GAP MATCH
  32. An analog signal (or waveform) is continuously varying signal characterized by amplitude and frequency.
  33. How big is the maximum data rate over an analog facility when there are analog loops at either end? CHOICE
  34. 33.6 Kbps.
  35. 56.6 Kbps
  36. 64 Kbps
  37. 48 Kbps
  38. What is Digital signal?. GAP MATCH
  39. Signal with continuously variable waveform, a sequence of discretepulses, representing bits with values one and zero
  40. What is Baseband? INLINE CHOICE
  41. Baseband is an adjective that describes signals and systems whose range of frequencies is measured from 0 to a maximumbandwidth or highest signal frequency; it is sometimes used as a noun for a band of frequencies starting at 0.
  42. What is line coding? GAP MATCH
  43. line coding or Baseband modulation aims at transferring a digitalbit stream over an analogbaseband channel.
  44. Why is necessary to convert between two signal types? HOTTEXT
  45. Today we don't have pure digital or pure analog networks; we have a mix of them,Collection of them Therefore, at various points in a network, is necessary to convert,to reduceto transfer between these two signal types.
  46. Name conversion devices HOTTEXT
  47. The devices that can handle conversions are called codecs,multiplexers,transformers and modems,transformers, stations.
  48. Why we need codec in cellular networks? INLINE CHOICE
  49. In cellular networks, because of the constraints and available spectrum, a codec needs to compress,modulate,amplify the voice further to get the most efficient use of the spectrum, channel, bandwith transmission
  50. What is the basis of term codec? CHOICE
  51. contraction of coder-decoder
  52. Core digital encryption
  53. Cooperative decryption
  54. What is the basis of term modem? CHOICE
  55. contraction of modulate-demodulate
  56. modern modulation
  57. mode of demodulation
  58. more decrypted modulation
  59. Why we need modems? INLINE CHOICE
  60. Modems used to infuse digital data,encrypted data ,electrical data ,more data onto transmission facilities,process, bandwith and vice versa
  61. Name digital modems CHOICE MULTIPLE
  62. ISDN,
  63. ADSL
  64. Smart modem
  65. Legacy modem
  66. V32bis
  67. V.everything
  68. How we can transmit digital signals over analog network? INLINE CHOICE
  69. We need modem, repeater, coder, quantizer between digital source and analog multiplexer, repeater, coder, quantizer
  70. What is sampling? INLINE CHOICE
  71. sampling is the reduction of a continuous, coded, encrypted, discrete signal to a discrete,coded, encrypted, discrete, continuous signal
  72. What is source coder? INLINE CHOICE
  73. source coder is a device that maps an analog, coded, encrypted, discrete input into a digital, coded, encryped, continuous output.
  74. Name the basic constituents of pulse code modulator (PCM) ORDER
  75. sampler, quantizer, symbol-to-bit mapper
  76. What is the aim of digital modulation? INLINE CHOICE
  77. The aim of digital modulation is to transfer a digital bit stream,coded signal, encrypted signal over an analog bandpass, copper wire, optical fiber, digital baseband channel
  78. What is the aim of analog modulation? INLINE CHOICE
  79. The aim of analog modulation is to transfer an analog lowpass, coded, encrypted, discrete signal over an analog bandpass,copper wire, optical fiber, digital baseband channel
  80. What is the aim of pulse modulation methods? INLINE CHOICE
  81. The aim of pulse modulation methods is to transfer a narrowband analog, coded, baseband, digital signal over a wideband lowpass, encrypted, narrowbaband, discrete channel or, in some of the schemes, as a bit stream, character stream,bait stream over another digital, widebaband, analog, point-to-point transmission system.
  82. Common analog modulation techniques groups are: CHOICE MULTIPLE

  1. Angular
/ modulations
  1. Amplitude

  1. Quadrature-phase

  1. Phase-separated

  1. Frequency-devided

  1. Most fundamental digital modulation techniques are (choose 4): CHOICE MULTIPLE
  2. Phase-shift modulation,
  3. frequency-shift modulation,
  4. amplitude-shift keying
  5. quadrature amplitude modulation
  6. basefrequency modulation
  7. orthogonalangular modulation
  8. singular modulation
  9. What is communications channel? INLINE CHOICE
  10. Channel, in communications (sometimes called communications channel), refers to the medium, state, object used to convey information, voice, microwave, frames from a sender (transmitter) to a receiver.
  11. What is quantization? INLINE CHOICE
  12. quantization is the process of approximating, rotating, conveying, transferring a continuous range of values, bits, baits, signals (or a very large set of possible discrete values, continuous values, functions, data) by a relatively-small set of discrete symbols, functions, bits or integer, current, single, floating-point values
  13. Name the Types of Network Connections CHOICE MULTIPLE
  14. Switched,
  15. Leased-line
  16. Dedicated
  17. Separated
  18. Parallel
  19. domain
  20. What is multiplexing? INLINE CHOICE
  21. multiplexing (short muxing) is a process where multiple, two, hundred, one analog message signals or digital data streams, information, code are combined into one, tremendous, baseband, lowpass signal.
  22. What is the aim of multiplexing? INLINE CHOICE
  23. The aim is to share an expensive resource, experience, computer, signal.
  24. Name the Transmission Modes CHOICE MULTIPLE
  25. Asynchronous
  26. Synchronous
  27. Splitted
  28. Amplified
  29. Modulated
  30. Describe Single-sideband modulation INLINE CHOICE
  31. Single-sideband modulation (SSB) is a refinement of amplitude modulation, frequency modulation, analog modulation, angle modulation that more efficiently uses electrical power, computers power, resources, bandwith and bandwidth, modem, router.
  32. What is main feature of Frequency-division multiplexing (FDM) INLINE CHOICE
  33. With FDM, the entire frequency band, electromagnetic spectrum, radio frequency band available on the communications link is divided into smaller individual bands, data rates, time slots, wavelenghts or channels, bands, bitstreams
  34. What is main feature of Time-division multiplexing (TDM) INLINE CHOICE
  35. Each device in a predetermined, random, ordered, separated sequence is allotted a time slot, channel, bandwidth, wavelength during which it can transmit
  36. What is main feature of Statistical time division multiplexing (STDM) INLINE CHOICE
  37. Statistical time division multiplexers dynamically, statistically, randomly, indenpendently allocate the time slots,channel, bandwidth, wavelength among the active terminals, which means you can actually have more terminals than you have time slots, channel, bandwidth, wavelength
  38. What is main feature of Wavelength-division multiplexing (WDM) INLINE CHOICE
  39. Wavelength-division multiplexing (WDM, DWDM, CWDM) is based on the concept of using multiple wavelengths, channels, time slots, physical layers of light, sound, microwave, infrared on a single fibre, wire, channel, band