True/False
Indicate whether the statement is
true or false.
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1.
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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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2.
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A fiber optic link can have high BER (bit error
rate) if the receiver power is either too high or too low.
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3.
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Industry standards have component losses higher
than typically expected in the real world.
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4.
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If you test a fiber in a cable plant that has
a loss budget of 7.5dB and get test results of 7.7dB loss, you should reject that
fiber.
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5.
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Power budget specs for network equipment links are
generally conservative becasue the output of transmitters and sensitivity of receivers varies from
unit to unit.
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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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A fiber optic link may have high bit-error rate if
____________.
a. | Receiver power is too high | b. | Receiver power is too low | c. | Receiver power is either too high or too
low |
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7.
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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. | +/- 0.05-0.10 dB | b. | +/- 0.2-0.5 dB | c. | +/- 0.5-1.0
dB | d. | >1 dB |
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8.
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If a transmitter has an output of +1dBm and
it’s companion receiver needs at least -13dBm to work, what is the power budget of this
link?
a. | 12dB | b. | 14dB | c. | 10dB | d. | Need specs of
connectors and splices to calculate it |
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9.
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A multimode premises cable has a length of 150m,
two intermediate connections as well as connections on each end. If the fiber attenuation coefficient
is 3dB/km at 850nm and connections have a loss of 0.5dB, what is the loss budget for this
cable? (Feel free to use the FOA Loss Calculator online)
a. | 1.45dB | b. | 5.0dB | c. | 2.90dZZZB | d. | 2.45dB |
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10.
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A intercity cable plant is 40km long. with 10
splices and connections on ly on the ends. If fiber attenuation coefficient is 0.4dB/km at 1310nm and
0.2dB/km at 1550nm, splices are 0.15dB and connections 0.3dB, what is the loss of the cable plant at
1310nm. (Feel free to use the FOA Loss Calculator online)
a. | 10.1dB | b. | 18.1dB | c. | 17.5dB | d. | 13.3dB |
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11.
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The communications equipment available for use on
the intercity cable plant described above has two options - 1310nm or 1550nm, both of which have a
13dB Power budget. Which one should be chosen for the link.
a. | 1310nm equipment | b. | 1550nm equipment |
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12.
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The difference between the power budget of the
network equipment and the loss budget of the cable plant is called the link ________.
a. | Margin | b. | Excess power | c. | Aging
constant | d. | Gravy |
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Multiple Response
Identify one or more choices
that best complete the statement or answer the question.
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13.
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When calculating a loss budget, one may use values
for component loss _________.
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14.
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The loss budget for the liber is calculated by
multiplying the _________ by the __________ of the fiber.
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15.
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The loss budget calculated at the design stage of a
project is used to ___________>
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