True/False
Indicate whether the statement is true or false.
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1.
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A loss budget is the calculated loss of the cable plant while a power budget is
the optical loss tolerable to a communications system.
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2.
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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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3.
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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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4.
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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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5.
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Loss budgets are used to ensure
__________.
A. | The network design will work with the chosen communications
equipment | B. | Losses of components chosen are appropriate for the cable plant | C. | The cable plant
tests have a comparison for pass/tail decisions | D. | All of the
above. |
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6.
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When calculating the loss budget, one should choose the component losses using
______.
A. | Loss values from industry standards that are always worst case | B. | Typical losses that
are generally lower than standards | C. | Either typical or standard losses as long as
it's documented in the design | D. | Lowest possible losses so the cable plant loss
budget looks better |
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7.
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One calculates the contribution of the loss of the fiber to the loss budget by
__________.
A. | Looking up the attenuation of the fiber on a manufacturer's data
sheet | B. | Dividing the length of the fiber by the attenuation | C. | Multiplying the
length of the fiber by the attenuation coefficient | D. | Choosing the best loss
possible |
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8.
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When calculating the contribution of the fiber loss to the loss budget, one must
consider the _________ .
A. | Size of the fiber | B. | Type of cable | C. | Termination of the
fiber | D. | Wavelength of the light in the fiber |
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9.
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Connector losses are calculated by adding up all the losses of the connectors,
always _______.
A. | Including the connectors on each end of the cable plant | B. | Including the
connectors on each end of the cable plant only if they are connected to a
patchcord | C. | Excluding the connectors on each end of the cable plant
| D. | Excluding the
connectors on each end of the cable plant if the cable is connected directly to a
transceiver |
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10.
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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/connection). The
calculated loss budget would be ________.
A. | 1.30 dB | B. | 2.30 dB | C. | 3.30
dB | D. | 5.00 dB |
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11.
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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 _________.
A. | 1.35 dB | B. | 2.35 dB | C. | 3.35
dB | D. | 6.50 dB |
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12.
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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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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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When calculating the loss budget of a cable plant, one totals the losses of all
the ____________ in the link.
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