Completion
Complete each statement.
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1.
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This is The FOA Online Design Self-Study Program
Case Study No. 8.
CCTV Surveillance System
A large government building is installing many
more CCTV cameras around the facility and connecting all the cameras to a central monitoring and
recording facility. Distances are large enough that fiber is needed and cameras with fiber interfaces
are ordered. Due to security concerns, all cable must be placed in metallic conduit. Backbone cables
are installed from the central facility to local zone boxes serving multiple cameras which are
connected individually. A typical link is shown below
Please
enter your name, CFOT/Membership number and date to begin this exercise.
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Multiple Choice
Identify the choice that best
completes the statement or answers the question.
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2.
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The CCTV video system has been designed over a
decade earlier, runs at low speeds using a 850nm LED transmitter and uses multimode graded-index
fiber. How does that affect the choice of fiber.
A. | It was probably designed around 62.5/125
fiber | B. | It was probably designed around laser-optimized
fiber | C. | It was probably designed for singlemode
fiber | D. | Any fiber will
work. |
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3.
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The backbone cable is run from the central facility to zone
boxes where individual cameras are connected. All runs are in metallic conduit. What is the
best choice for cable type?
A. | Loose tiber cable pulls easier in conduit.and is easier
to terminate | B. | Breakout cable is
more rugged. | C. | Distribution cable
is smaller and lighter for indoor runs that must be pulled in conduit. | D. | A bundle of zipcord. |
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4.
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Since distances are known, can some of the cables
be preterminated to speed installation?
A. | Yes, any cables can be pulled already
terminated. | B. | No, you cannot
pull preterminated cable in conduit because there is no room for
connectors. | C. | The cables can be
terminated on one end then pulled back from the ends to a control room where all can be terminated at
that end at once. |
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5.
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If the cable run is long and pulling tension
is high in then _____ .
A. | You should use a stronger pull
rope | B. | You should lubricate the
cable. | C. | You should use special cable designed to be pulled in
conduit. | D. | You should use cable trays
instead. |
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6.
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Using the parameters specified including all cable
lengths, losses, equipment specifications, etc.) calculate a loss budget for the link described below
and confirm equipment suitability.
Communications Equipment
| System | Transmitter Wavelength | Transmitter Power (dBm) | Receiver Power (Min) | Receiver Power (Max) | | Video link | 850 nm | -15 dBm | -30 dBm | -10 dBm | | | | | |
Link length 330m,
62.5/125 fiber.
Use TIA-568 loss specifications.
A. | Yes | B. | No, not enough power at receiver | C. | Yes but requires an attenuator of 5 dB at
receiver |
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7.
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Using the same transmitter and receiver
specifications, how long a link could be supported on 62.5/125 fiber wit no more than 4 connectors?
(Use TIA component specifications and leave 3 dB margin for system degradation.)
A. | 850 m | B. | 1.3 km | C. | 2.0
km | D. | 2.57 km |
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Multiple Response
Identify one or more choices
that best complete the statement or answer the question.
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8.
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What parameters should be tested and documented on
this cable plant to confirm proper installation?
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9.
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What should be included in the design documents to
have the customer prepare for restoration in case of an outage?
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10.
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What about OTDR tests?
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