Equipment In Specification Knowledge Check

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| By Duncanclayton211
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Duncanclayton211
Community Contributor
Quizzes Created: 3 | Total Attempts: 1,503
Questions: 10 | Attempts: 76

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Equipment In Specification Knowledge Check - Quiz


Questions and Answers
  • 1. 

    The minimum SNR for QAM 256 is:

    Explanation
    34dB

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  • 2. 

    The minimum upstream power level is ___dBmv

    Explanation
    33dBmv

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  • 3. 

    What is the maximum and minimum digital signal power levels at the input of a device  for QAM 256 is? (Select one answer)

    • A.

      +8 to +2 dBmv

    • B.

      +6 to -4 dBmv

    • C.

      +10 to -6dBmv

    • D.

      +8 to -2 dBmv

    • E.

      +6 to +2 dBmv

    Correct Answer
    C. +10 to -6dBmv
  • 4. 

    What is the maximum  permissible slope between two QAM 256 frequencies at the input to equipment?

    • A.

      +/-4dB

    • B.

      +/-8dB

    • C.

      +/-3dB

    • D.

      +/-10dB

    • E.

      +/- 6dB

    • F.

      +/- 0dB

    Correct Answer
    B. +/-8dB
    Explanation
    The maximum permissible slope between two QAM 256 frequencies at the input to equipment is +/-8dB. This means that the signal can vary in amplitude by up to 8 decibels without causing any significant distortion or interference. A larger slope would indicate a steeper change in amplitude, which could lead to signal degradation and potential errors in transmission. Therefore, a maximum permissible slope of +/-8dB ensures that the signal remains within acceptable limits for reliable communication.

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  • 5. 

    The maximum upstream (return path) power level is? (Select one answer)

    • A.

      55dBmv

    • B.

      54dBmv

    • C.

      51dBmv

    • D.

      53dBmv

    • E.

      52dBmv

    • F.

      49dBmv

    Correct Answer
    C. 51dBmv
    Explanation
    The maximum upstream (return path) power level is 51dBmv. This means that the highest allowed power level for signals traveling back to the source is 51 decibels above 1 millivolt. It is important to ensure that the power level does not exceed this limit to prevent signal degradation or interference.

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  • 6. 

    What is the maximum and minimum signal input levels  at a device for QAM 64?

    • A.

      +3 to -3dBmv

    • B.

      +55 to - 11dBmv

    • C.

      +10 to -6dBmv

    • D.

      +5 to - 11dBmv

    • E.

      +6 to -8dBmv

    • F.

      +4 to - 10dBmv

    Correct Answer
    D. +5 to - 11dBmv
  • 7. 

    What is the minimum acceptable SNR for a QAM 64 frequency? 

    Correct Answer
    29
    29dB
    29DB
    29db
    Explanation
    The minimum acceptable SNR for a QAM 64 frequency is 29, 29dB, 29DB, or 29db. SNR stands for Signal-to-Noise Ratio, which measures the strength of the signal compared to the background noise. In this case, the minimum acceptable SNR is 29, which indicates that the signal needs to be at least 29 times stronger than the noise for reliable communication. The answer options provided all represent the same value of 29, but in different formats (numeric, decibels, uppercase, lowercase).

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  • 8. 

    Calculate the slope between the following QAM 256 frequencies.Remember to indicate if the slope is positive or negative by using a - or + sign before the number. Your High digital frequency is measured at +2dBmv and your Low frequency at +6dBmv 

    Correct Answer
    -4
    -4dB
    -4DB
    -4db
    Explanation
    The slope between the given QAM 256 frequencies is -4. This indicates a negative slope. The difference between the high digital frequency (+2dBmv) and the low frequency (+6dBmv) is 4dB, and since it is negative, the slope is represented as -4.

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  • 9. 

    Calculate the slope between these two QAM 256 frequencies. Remember to put a - or + in-front of your answer to indicate if the slope is negative or positive.The high digital frequency level is -5dBmv and the low digital frequency is +2dBmv

    Correct Answer
    -7dB
    -7
    -7DB
    -7db
    Explanation
    The slope between the two QAM 256 frequencies can be calculated by finding the difference in dBmv values and dividing it by the frequency difference. In this case, the high digital frequency level is -5dBmv and the low digital frequency is +2dBmv. The difference between these two values is (-5) - (+2) = -7dBmv. Therefore, the slope is -7dB.

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  • 10. 

    Calculate the expected signal loss using the following information.
    • Length of drop cable = 180 metres
    • Frequency loss per 10metres = 2dB

    Correct Answer
    36dB
    36
    36DB
    36db
    Explanation
    to calculate: 180 divided by 10 = 18.............18 X 2 = 36

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