644-334 SP Video Phase III Cable Access

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Question 1

How much will the RF output level change when the optical input level to a receiver
changes be 1 dB?

  • A. 1 dB
  • B. 2 dB
  • C. 3dB
  • D. 4dB

Answer : B

Question 2

What are the three Key benefits of a Hybrid Fiber Coaxial network compared to an all
coaxial' network? (Choose three)

  • A. improves overall reliability and end-of-line signal quality
  • B. Facilitates delivery of Narrowcast (targeted) services
  • C. eliminates the need for outdoor power supplies
  • D. Reduces noise accumulation in the upstream signal path
  • E. Redamount of fiber in the network

Answer : A,B,D

Question 3

What is the result effect on signal quality when adding optical amplifiers to a design?

  • A. theCNR is reduced, but the distortions are relatively unchanged
  • B. theCNR improves, but the distortions are reduced
  • C. theCNR is reduced, but distortions are improved
  • D. theCNR is relatively unchanged, but the distortions are improved

Answer : D

Question 4

Which of the following characteristics are present when a Cisco gain-flattened EDFA is
operated in the constant gain' mode?

  • A. Fixed aggregate optical power at the output when new wavelengths are added
  • B. A fixed gain, determined at the factory and specified by a unique OrderingCode
  • C. Fixed gain per wavelength, even when new wavelengths are added
  • D. A gain which is tightly controlled by an AGC system, provided no new wavelengths are added

Answer : C

Question 5

What should be emphasized when presenting the end-of-line' signal quality calculations to

  • A. Themethodof computing the cumulative contribution of all the active devices in the network, particularly the CTB and XMD components.
  • B. The values that have been assumed forcoaxialcable attenuation
  • C. The power consumption of each active device
  • D. The insignificance of the optical network contribution

Answer : A

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