FOA CFOT COMPREHENSIVE QUESTIONS AND
ANSWERS SET A+
✔✔Fault location, splice loss, length (Which Tool(s) do you use?) - ✔✔OTDR
✔✔Continuity, fiber tracing, fault location close to end of a cable (Which Tool(s) do you
use?) - ✔✔Visual fault locator
✔✔Cable to test - ✔✔Cable in the middle wrapped multiple times in circles
✔✔Connector mating adapter - ✔✔Device that connect two wires together
✔✔Launch cable - ✔✔Cable connected to the light source
✔✔Light source - ✔✔Device at the end shining a light or laser
✔✔Power meter - ✔✔Device taking measurements and giving out numbers
✔✔Receive cable - ✔✔Cable connected to the power meter
✔✔Connector, showing loss and back reflection - ✔✔High spike (upside down V) in the
middle of the graph
✔✔Distance scale - ✔✔On the graph it will be X-axis (left to right) on the bottom side
✔✔End of the fiber - ✔✔Zig-Zag lines at the end of the graph
✔✔Initial pulse and dead zone - ✔✔High spike of energy (upside down U) at the
beginning of the graph
✔✔Loss scale - ✔✔On the graph it will be the Y-axis (up and down) on the left side
, ✔✔Splice loss - ✔✔A drop of energy (like a step) in the middle of the graph
✔✔Fiber Size - ✔✔um (microns)
✔✔Wavelength - ✔✔nm (nanometers)
✔✔Bandwidth - ✔✔MHz or GHz (megahertz or gigahertz)
✔✔Loss - ✔✔dB (decibels)
✔✔Absolute power - ✔✔dBm (decibels per milliwatts)
✔✔Cable jacket outside diameter - ✔✔mm or in (millimeters or inches)
✔✔Cable Length - ✔✔ft or m (feet or meters)
✔✔ A fiber optic inspection microscope can increase the danger of high powered light
sources by focusing the light coming out of a fiber into your eye. True or False? -
✔✔True
✔✔A fiber optic power meter measures absolute power in dBM (dB referenced to 1 mw)
and, when used with a light source, can measure insertion loss expressed in dB. True
or False? - ✔✔True
✔✔When we say 62.5/125 fiber, what does "62.5" mean? - ✔✔core size, the diameter
in microns
✔✔When we say 50/125 fiber, what does "125" mean? - ✔✔cladding size, the diameter
in microns
✔✔OM3 and OM4 multimode fiber with a 50/125 micron core are now a popular option
in premises cabling systems because they _____. - ✔✔Are "laser optimized" which
gives more distance capability with gigabit networks using laser sources
✔✔In-multimode fiber, the attenuation (reduction in optical power) of the fiber is _____
at 850 nm than at 1300 nm. - ✔✔Higher
✔✔Which of the following represents a singlemode (smaller core size) fiber size? -
✔✔9/125 micron
✔✔Singlemode fiber has _____ bandwidth than multimode fiber. - ✔✔greater
ANSWERS SET A+
✔✔Fault location, splice loss, length (Which Tool(s) do you use?) - ✔✔OTDR
✔✔Continuity, fiber tracing, fault location close to end of a cable (Which Tool(s) do you
use?) - ✔✔Visual fault locator
✔✔Cable to test - ✔✔Cable in the middle wrapped multiple times in circles
✔✔Connector mating adapter - ✔✔Device that connect two wires together
✔✔Launch cable - ✔✔Cable connected to the light source
✔✔Light source - ✔✔Device at the end shining a light or laser
✔✔Power meter - ✔✔Device taking measurements and giving out numbers
✔✔Receive cable - ✔✔Cable connected to the power meter
✔✔Connector, showing loss and back reflection - ✔✔High spike (upside down V) in the
middle of the graph
✔✔Distance scale - ✔✔On the graph it will be X-axis (left to right) on the bottom side
✔✔End of the fiber - ✔✔Zig-Zag lines at the end of the graph
✔✔Initial pulse and dead zone - ✔✔High spike of energy (upside down U) at the
beginning of the graph
✔✔Loss scale - ✔✔On the graph it will be the Y-axis (up and down) on the left side
, ✔✔Splice loss - ✔✔A drop of energy (like a step) in the middle of the graph
✔✔Fiber Size - ✔✔um (microns)
✔✔Wavelength - ✔✔nm (nanometers)
✔✔Bandwidth - ✔✔MHz or GHz (megahertz or gigahertz)
✔✔Loss - ✔✔dB (decibels)
✔✔Absolute power - ✔✔dBm (decibels per milliwatts)
✔✔Cable jacket outside diameter - ✔✔mm or in (millimeters or inches)
✔✔Cable Length - ✔✔ft or m (feet or meters)
✔✔ A fiber optic inspection microscope can increase the danger of high powered light
sources by focusing the light coming out of a fiber into your eye. True or False? -
✔✔True
✔✔A fiber optic power meter measures absolute power in dBM (dB referenced to 1 mw)
and, when used with a light source, can measure insertion loss expressed in dB. True
or False? - ✔✔True
✔✔When we say 62.5/125 fiber, what does "62.5" mean? - ✔✔core size, the diameter
in microns
✔✔When we say 50/125 fiber, what does "125" mean? - ✔✔cladding size, the diameter
in microns
✔✔OM3 and OM4 multimode fiber with a 50/125 micron core are now a popular option
in premises cabling systems because they _____. - ✔✔Are "laser optimized" which
gives more distance capability with gigabit networks using laser sources
✔✔In-multimode fiber, the attenuation (reduction in optical power) of the fiber is _____
at 850 nm than at 1300 nm. - ✔✔Higher
✔✔Which of the following represents a singlemode (smaller core size) fiber size? -
✔✔9/125 micron
✔✔Singlemode fiber has _____ bandwidth than multimode fiber. - ✔✔greater
