Rep 1- Rep 2 Exam Questions With Verified d d d d d d d d
Answers
When light strikes a medium at an angle less than the critical angle, what happens to the
d d d d d d d d d d d d d d d d d
light? - d d
It is reflected
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In a fiber optic cable, what is the purpose of the cladding? -
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To guide the light down the fiber
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You are planning a fiber optic network and want to amplify the signal so you can send it
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farther into the field. At which wavelength must the laser emit? -
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1550 nm
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It is important to follow safety procedures when installing and handling fiber optic cable.
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What should you use to pick up fiber pieces after you splice a cable? -
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Tweezers
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You are doing an aerial installation of fiber optic cable. When you survey the installation
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path, you see that the path runs near several short outbuildings and over a series of hedges.
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Which installation method should you use? -
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The pull in method
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Poor performance in the fiber optic network leads you to believe that there is a fault in the
d d d d d d d d d d d d d d d d d d
fiber optic cable and you want to test a section of the network with an optical time domain
d d d d d d d d d d d d d d d d d d
reflectometer OTDR, How should you connect the OTDR to the fiber optic cable? - d d d d d d d d d d d d d d
With an optical mechanical splice
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As you prepare to set up the fiber optic network, you realize you need a coupler that will
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allow any of its ports to be used as either input or output. Which coupler should you choose?
d d d d d d d d d d d d d d d d d d
- d
A reflective star coupler
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As cable companies have expanded their use of fiber optic cable, they have also brought it
d d d d d d d d d d d d d d d d
closer to the customer premises, increasing the bandwidth available to customers. Which
d d d d d d d d d d d d
answer below represents the progression of fiber optic network architecture? -
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Fiber to the feeder *FTTF* - Fiber to the neighborhood *FTTN* - Fiber to the curb
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*FTTC* - and Fiber to the home *FTTH* d d d d d d d
Why is the broadband cable industry developing its own passive optical network (PON)
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standard instead of using standards already developed by the International
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Telecommunication Union (ITU) and the Institute of Electrical and Electronics Engineers d d d d d d d d d d d
(IEEE) - d d
The industry has invested a lot of money in HFC Networks, Data Over Cable
d d d d d d d d d d d d d d d d d d d d d d d d d d d d
Service Interface Specification, and other systems and devices that are still currently being
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used, but they are not compatible with ITU and IEEE PON standards.
d d d d d d d d d d d
1|Page
, What serves as an amplifier in fiber optic networks, allowing light signals to travel farther
d d d d d d d d d d d d d d d
while retaining signal strength? -
d d d d d
EDFA, An erbium-doped fiber amplifier
d d d d d d d d d d d d d d d d d d
What is the name of the group that established standards for the television industry, ensuring
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a single system would deliver consistent service across the nation? -
d d d d d d d d d d d
The National Television System Committee (NTSC)
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What signal modulation technique do cable operators use to transport digital television
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signals through the cable network? -
d d d d d d
QAM Quadrature Amplitude Modulation
d d d d d d d d d d d d d d d d d
What is the major change in enhanced definition TV (EDTV) that improves picture quality
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over SDTV - d d d
The use of progressive scanning in EDTV
d d d d d d d d d d d d d d d d d d d d
What legislation required all television stations to switch to digital only broadcasting? -
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The US Deficit Reduction Act
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Why are digital terminal adapters more cost effective than a full featured set top box? -
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DTA's do not require RF upstream
d d d d d d d d d d d d d d d d d d d
What terrestrial transmission technology did the Advanced Television Systems Committee
d d d d d d d d d d
(ATSC) select? - d d d
Eight level vestigial sideband (8-VSB)
d d d d d d d d d d d d d d d d d d
Which system advanced television to high definition? -
d d d d d d d d
MUSE The multiple sub-Nyquist sampling encoding system
d d d d d d d d d d d d d d d d d d d d
How do set top boxes typically connect to high definition televisions to provide the best
d d d d d d d d d d d d d d d
picture quality? - d d d
HDMI
d d d d d d d d d d d d d d
What inexpensive device is used by cable operators to provide digital tv services to all of
d d d d d d d d d d d d d d d d
their customers? -
d d d
A DTA
d d d d d d d d d d d d d d d
Which technology enables cable operators to control access to services by encrypting the
d d d d d d d d d d d d d
programming? - d d
Conditional Acess (CA)
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What major sources of television programming are available to broadband cable operators? -
d d d d d d d d d d d d d
Over the air, terrestrial microwave, direct cable feed, and local origination
d d d d d d d d d d d d d d d d d d d d d d d d d
programming
What are the three main elements of a broadband cable network? -
d d d d d d d d d d d d
The headend, the distribution network composed of coaxial cable and/or fiber optical
d d d d d d d d d d d d d d d d d d d d d d d d d
cable, and the drop at the customer premises.
d d d d d d d d
2|Page
Answers
When light strikes a medium at an angle less than the critical angle, what happens to the
d d d d d d d d d d d d d d d d d
light? - d d
It is reflected
d d d d d d d d d d d d d d d d
In a fiber optic cable, what is the purpose of the cladding? -
d d d d d d d d d d d d d
To guide the light down the fiber
d d d d d d d d d d d d d d d d d d d d
You are planning a fiber optic network and want to amplify the signal so you can send it
d d d d d d d d d d d d d d d d d d
farther into the field. At which wavelength must the laser emit? -
d d d d d d d d d d d d
1550 nm
d d d d d d d d d d d d d d d
It is important to follow safety procedures when installing and handling fiber optic cable.
d d d d d d d d d d d d d d
What should you use to pick up fiber pieces after you splice a cable? -
d d d d d d d d d d d d d d d
Tweezers
d d d d d d d d d d d d d d
You are doing an aerial installation of fiber optic cable. When you survey the installation
d d d d d d d d d d d d d d d
path, you see that the path runs near several short outbuildings and over a series of hedges.
d d d d d d d d d d d d d d d d d
Which installation method should you use? -
d d d d d d d
The pull in method
d d d d d d d d d d d d d d d d d
Poor performance in the fiber optic network leads you to believe that there is a fault in the
d d d d d d d d d d d d d d d d d d
fiber optic cable and you want to test a section of the network with an optical time domain
d d d d d d d d d d d d d d d d d d
reflectometer OTDR, How should you connect the OTDR to the fiber optic cable? - d d d d d d d d d d d d d d
With an optical mechanical splice
d d d d d d d d d d d d d d d d d d
As you prepare to set up the fiber optic network, you realize you need a coupler that will
d d d d d d d d d d d d d d d d d d
allow any of its ports to be used as either input or output. Which coupler should you choose?
d d d d d d d d d d d d d d d d d d
- d
A reflective star coupler
d d d d d d d d d d d d d d d d d
As cable companies have expanded their use of fiber optic cable, they have also brought it
d d d d d d d d d d d d d d d d
closer to the customer premises, increasing the bandwidth available to customers. Which
d d d d d d d d d d d d
answer below represents the progression of fiber optic network architecture? -
d d d d d d d d d d d
Fiber to the feeder *FTTF* - Fiber to the neighborhood *FTTN* - Fiber to the curb
d d d d d d d d d d d d d d d d d d d d d d d d d d d d d d
*FTTC* - and Fiber to the home *FTTH* d d d d d d d
Why is the broadband cable industry developing its own passive optical network (PON)
d d d d d d d d d d d d d
standard instead of using standards already developed by the International
d d d d d d d d d d
Telecommunication Union (ITU) and the Institute of Electrical and Electronics Engineers d d d d d d d d d d d
(IEEE) - d d
The industry has invested a lot of money in HFC Networks, Data Over Cable
d d d d d d d d d d d d d d d d d d d d d d d d d d d d
Service Interface Specification, and other systems and devices that are still currently being
d d d d d d d d d d d d d
used, but they are not compatible with ITU and IEEE PON standards.
d d d d d d d d d d d
1|Page
, What serves as an amplifier in fiber optic networks, allowing light signals to travel farther
d d d d d d d d d d d d d d d
while retaining signal strength? -
d d d d d
EDFA, An erbium-doped fiber amplifier
d d d d d d d d d d d d d d d d d d
What is the name of the group that established standards for the television industry, ensuring
d d d d d d d d d d d d d d d
a single system would deliver consistent service across the nation? -
d d d d d d d d d d d
The National Television System Committee (NTSC)
d d d d d d d d d d d d d d d d d d d
What signal modulation technique do cable operators use to transport digital television
d d d d d d d d d d d d
signals through the cable network? -
d d d d d d
QAM Quadrature Amplitude Modulation
d d d d d d d d d d d d d d d d d
What is the major change in enhanced definition TV (EDTV) that improves picture quality
d d d d d d d d d d d d d d
over SDTV - d d d
The use of progressive scanning in EDTV
d d d d d d d d d d d d d d d d d d d d
What legislation required all television stations to switch to digital only broadcasting? -
d d d d d d d d d d d d d
The US Deficit Reduction Act
d d d d d d d d d d d d d d d d d d
Why are digital terminal adapters more cost effective than a full featured set top box? -
d d d d d d d d d d d d d d d d
DTA's do not require RF upstream
d d d d d d d d d d d d d d d d d d d
What terrestrial transmission technology did the Advanced Television Systems Committee
d d d d d d d d d d
(ATSC) select? - d d d
Eight level vestigial sideband (8-VSB)
d d d d d d d d d d d d d d d d d d
Which system advanced television to high definition? -
d d d d d d d d
MUSE The multiple sub-Nyquist sampling encoding system
d d d d d d d d d d d d d d d d d d d d
How do set top boxes typically connect to high definition televisions to provide the best
d d d d d d d d d d d d d d d
picture quality? - d d d
HDMI
d d d d d d d d d d d d d d
What inexpensive device is used by cable operators to provide digital tv services to all of
d d d d d d d d d d d d d d d d
their customers? -
d d d
A DTA
d d d d d d d d d d d d d d d
Which technology enables cable operators to control access to services by encrypting the
d d d d d d d d d d d d d
programming? - d d
Conditional Acess (CA)
d d d d d d d d d d d d d d d d
What major sources of television programming are available to broadband cable operators? -
d d d d d d d d d d d d d
Over the air, terrestrial microwave, direct cable feed, and local origination
d d d d d d d d d d d d d d d d d d d d d d d d d
programming
What are the three main elements of a broadband cable network? -
d d d d d d d d d d d d
The headend, the distribution network composed of coaxial cable and/or fiber optical
d d d d d d d d d d d d d d d d d d d d d d d d d
cable, and the drop at the customer premises.
d d d d d d d d
2|Page
