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BICSI ITSIMM 8th Edition Test Bank
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BICSI ITSIMM 8th Edition Test BankGraded index optical fiber eliminates the effects of modal dispersion. - ANS False
Macrobends in optical fiber strands are ________ to the installer. - ANS Visible
In optical fibers, dispersion factors ______ the BER and ______ the effective bandwidth. - ANS
DSL technology uses available bandwidth above the POTS range on existing PSTN copper loops. - ANS
True
Capacitance causes a voltage difference between two wires when seperated by insulation. - ANS True
Total dispersion is the _______ modal dispersion and chromatic dispersion. - ANS Sum of
The relationship of core and cladding that make up an optical fiber is called: - ANS
Crosstalk values are typically expressed as a negative decibel value. - ANS True
A ______ equals a frequency of one million cycles in one second. - ANS Megahertz
It may be possible to eliminate the need for metallic conduit in some environments by using
screened/shielded cabling. - ANS True
The pair lay of a balanced twisted-pair cable varies from approximately 6mm (0.24in) to approximately: -
ANS 150mm (6in)
,For OS1a indoor-outdoor, singlemode optical fiber cable, attenuation at 1383 nm can be as high as
______ dB/km. - ANS 1.5 dB/km
The _____ type of optical fiber cable consists of multiple 1.6mm (.06in) through 3mm (.12in) subunits of
individually jacketed strands under a single overall jacket. - ANS Breakout
The overfilled launch (OFL) bandwidth of an OM5 multimode fiber is _____ MHz-km at 850nm. - ANS
3500 MHz-km
A decrease of _____ dB results in halving of the voltage. - ANS 6 dB
Attenuation is also referred to as _____ loss. - ANS Insertion
A battery is an example of an AC source. - ANS False
A 'bel' is a measure of _____ signal strength. - ANS Analog
A codec is used to convert the amplitude changes of various frequencies into a digital format for
transmission over digital transmission media. - ANS True
The _____ cable marking for fire rating designates a 'communications limited use' type of copper cable. -
ANS CMX
Balanced twisted-pair cabling channel performance associates a frequency of _____ MHz with a TIA
Category 5e. - ANS 100 MHz
An EMI source is always external to the cable containing the affected circuit. - ANS False
, Optical fiber bandwidth is limited by total dispersion, which is the sum of modal dispersion and
chromatic dispersion. - ANS True
A stranded wire will always have a _____ overall diameter than a solid wire with the same AWG. - ANS
Larger
_____ is the widening or spreading out of the modes in a light pulse as it progresses along the optical
fiber. - ANS Dispersion
Analog transmissions uses continuously varying electrical signals. - ANS True
Return loss values are typically a _____ decibel value. - ANS Negative
Fit, alignment, functionality, and configuration are all considered to be key factors in establishing a good
connection and minimizing loss of signal. - ANS True
An increase of 10dB for power will cause an increase of _____ times the original dB value. - ANS 10
A digital signal is a _____ signal that changes from one state to another in a number of distinct steps
within fixed time slots. - ANS Discontinuous
For all versions of multimode optical fiber cable (OM1 - OM5) attenuation at 1300nm can be as high as
______ dB/km. - ANS 1.5 dB/km
The decibel is a _____ function. - ANS Logarithmic
Ohm's Law can be stated as: - ANS V = I x R
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