True/False
Indicate whether the statement is true or false.
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1.
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You can test fiber optic cables with a source of
any wavelength since the loss measured will always be the same.
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2.
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If every fiber tested in a cable shows high loss,
the first thing to check is the test equipment and reference patchcords.
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3.
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Connectors at each end of the cable plant should
not be counted when calculating the cable plant loss.
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4.
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Loss budgets calculate the loss of the entire cable
plant and all its components including the connectors on each end of the cable plant.
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5.
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Industry standards have high values for component
loss compared to typical values expected in normal installations.
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Multiple Choice
Identify the choice that best completes the statement or
answers the question.
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6.
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To test the loss of an installed fiber optic cable
plant, you will need a light source, power meter and _________.
A. | OTDR | B. | One reference test cable with a mating adapter | C. | Two reference test cables with two mating adapters | D. | A flashlight |
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7.
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The reference cables you need for testing
___________.
A. | Can be any old cables in your
toolkit | B. | Should be random patch cables used for connecting
equipment to the cable plant | C. | Should be known
good cables regularly tested for low loss | D. | Must be special
reference-grade test cables purchased from the test equipment
manufacturer. |
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8.
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Connectors on reference test cables should be
inspected with a microscope and cleaned __________.
A. | Regularly, preferably between every
measurement | B. | When loss results
start getting lower | C. | Never as it can
ruin a good connector | D. | When the ceramic
ferrules turn black |
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9.
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. If a cable plant tests shows unacceptably high
loss, the first thing the tech should do is ___________.
A. | Inspect and clean all
connectors | B. | Check the
calibration of the test equipment | C. | Test the reference
cables for connector loss | D. | Test again with a
high resolution OTDR |
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10.
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Which fiber testing equipment do you need to
measure the insertion loss of an installed cable plant ~10m (~33 feet) long.
A. | Visual Tracer/Fault Locator | B. | LSPM or OLTS | C. | OTDR | D. | Inspection
Microscope |
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11.
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Mixing 50/125 micron fiber with 62.5/125 fiber can
cause:
A. | Excess loss when coupling from 50/125 to
62.5/125 fiber. | B. | Excess loss when
coupling from 62.5/125 to 50/125 fiber. | C. | Gains when coupling from 62.5/125 to 50/125
fiber. | D. | There is no problem coupling these two
fibers. |
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12.
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In a 1 km multimode cable, fibers test with about
the same loss at both 850 and 1300 nm – about 4 dB. Why?
A. | Nothing is wrong - that’s what it should have for
loss. | B. | The source wavelengths are wrong for multimode
fibers | C. | The cable is under severe stress somewhere along its
length | D. | All the connectors are
bad |
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13.
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The total loss of the fiber in the cable plant is
calculated by multiplying the attenuation of the fiber by the _________ the adding the loss of the
connectors and splices.
A. | Length | B. | Number of links | C. | Number of
connectors | D. | Number of
splices |
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14.
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Multimode graded-index glass
fiber optic cables are tested with sources at ______ and _____ wavelengths.
A. | 650, 850
nm | B. | 850, 1300
nm | C. | 980, 1400
nm | D. | 1310, 1550
nm |
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15.
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What type of source is used for
testing singlemode fibers?
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16.
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What type of source is used for
testing multimode fibers?
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17.
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How many methods are included
in standards for setting the Ò0 dBÓ reference for loss testing?
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18.
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How many reference cables
should be used for setting the “0 dB” reference for loss testing when testing cables with
connectors like the SC, ST or LC?
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19.
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How many reference cables
should be used for setting the “0 dB” reference for loss testing when testing cables with
plug/receptable connectors like MTP/MPOs?
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20.
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Reference cables must match the
________ of the cables being tested.
A. | Fiber size and
type | B. | Fiber size and connector type | C. | Connector type | D. | Fiber size and loss
specification |
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21.
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The calculated loss budget can be used as a
reference value for testing as well as a check to see if the system will operate over the cable plant
being designed, but one needs to allow for a measurement uncertainty of _______ when setting
PASS/FAIL limits.
A. | 0.01-0.05dB | B. | 0.2-0.5dB | C. | 0.5-1.0dB | D. | >1dB |
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22.
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A premises cabling link 100 meters long uses
multimode fiber (3.0 dB/km @ 850nm) and two connections in the middle as well as two connectors on
the ends (0.50 dB/connector). The calculated loss budget would be ________.
A. | 1.30 dB | B. | 2.30 dB | C. | 3.30
dB | D. | 5 dB |
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23.
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Recalculate the loss budget of the premises cabling
link above (100m with 2 connections and connectors on each end) using TIA 568 worst case component
losses (fiber at 3.5dB/km and connections at 0.75dB). Then the loss budget now becomes
_________.
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Multiple Response
Identify one or more choices that best complete the
statement or answer the question.
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24.
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Reference test cables must _________.
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25.
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Although you start by calibrating the source and
power meter with the reference cables for "0 dB" loss, __________.
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26.
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Fibers tested with a light meter and power source
show a “gain” not a loss. What is likely happening?
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