REPTH1–TH2 EXAM QUESTIONS WITH VERIFIED ANSWERS – GRADED A+

REP1- REP2 EXAM QUESTIONS th th th th th




When light strikes a medium at an angle less than the critical angle, what happens to the light? -
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th It is reflected
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In a fiber optic cable, what is the purpose of the cladding? -
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q To guideqthe light down theqfiber t h th th th th




You are planning a fiber optic network and want to amplify the signal so you can sendqit farther into
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the field. At which wavelength must the laser emit? -
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1550 nm th




It is important to follow safety procedures when installingqand handling fiber optic cable. What sho
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uld you useqto pickqup fiber pieces after you splice a cable? -
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Tweezers

You are doing an aerial installation of fiber optic cable. When you survey the installation path, you
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see that theqpath runs near several short outbuildings and over a series of hedges. Which in stallatio
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n method should you use? -
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The pull in method th th th




Poor performance in the fiber optic network leads you to believe that there is a fault in the fiber opti
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cqcable and youqwant to testqa section of the network with an optical time domain reflectom eter O
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TDR, How should you connect the OTDR to the fiber optic cable? -
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With an optical mechanical splice th th th th




As you prepare to set up the fiber optic network, you realize you need a coupler that will allow any
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of its ports to be used as either input or output. Which coupler should you choose? -
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A reflective star coupler th th th




As cable companies have expanded their use of fiber optic cable, they have also brought it clos er to
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the customer premises, increasing the bandwidth available to customers. Which answer b elow re
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presents theqprogression of fiber optic network architecture? - th th th th th th th



Fiber to the feeder *FTTF* - Fiber to theqneighborhood *FTTN* - th th th th th th th th th th



Fiber to the curbq*FTTC* - and Fiber to the home *FTTH*
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Why is the broadband cable industry developingqits own passive optical network (PON) standa rd i
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nstead of usingqstandards already developed by theqInternational Telecommunication Unio n (IT
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U) and the Institute of Electrical and Electronics Engineers (IEEE) -
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The industry has invested a lot of money in HFC Networks, Data Over Cable ServiceqIn terf th th th th th th th th th th th th th th th



aceqSpecification, and other systems and devices that are still currently being used, but they are not th th th th th th th th th th th th th th th



compatible with ITU and IEEE PON standards.
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What serves as an amplifier in fiber optic networks, allowingqlight signals to travel farther whil e re
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tainingqsignal strength? - th th



EDFA, Anqerbium-doped fiber amplifier th th th




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, What is the name of the group that established standards for the television industry, ensuring a singl
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e system would deliver consistent service across the nation? -
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The National Television System Committee (NTSC) th th th th th




What signal modulation technique do cable operators use to transport digital television signals thro
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ugh the cable network? -
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QAM Quadrature Amplitude Modulation th th th




What is the major change in enhanced definition TV (EDTV) that improves picture quality ove r S
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DTV - th



The use of progressive scanning in EDTV th th th th th th




What legislation required all television stations to switch to digital only broadcasting? -
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The US Deficit Reduction Act th th th th th




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 th th th th th th




What terrestrial transmission technology did the Advanced Television Systems Committee (A TS
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C) select? -
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Eight level vestigial sideband (8-VSB) th th th th




Which system advanced television to high definition? -
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MUSE Theqmultiple sub-Nyquist sampling encoding system th th th th th




How do set top boxes typically connect to high definition televisions to provide the best picture qua
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lity? - th



HDMI

What inexpensive device is used by cable operators to provide digital tv services to all of their custo
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mers? - th



A DTA th




Which technology enables cable operators to control access to services by encrypting the progr am
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ming? - th



Conditional Acess (CA) th th




What major sources of television programming are available to broadband cable operators? -
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Over the air, terrestrial microwave, direct cable feed, and local origination programmin
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g

What are the three main elements of a broadband cable network? -
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The headend, the distribution network composed of coaxial cable and/or fiber optical ca ble
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, and the drop at the customer premises.
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In a broadband cable network, what group is responsibleqfor ensuring that theqnetwork remains in s
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mooth running order by dispatching crews to carry out routingqsystem testing, preventative maint
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enance, and equipment servicing and replacement? -
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Network operations center (NOC) th th th




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