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Press
the "Forward" button to continue.
CCTV
and Access Control Applications |
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Imagine
that we want to install eight CCTV cameras in a
building that is 300 meters (1000 ft.) from the
monitoring station. If installed with coaxial copper
cable, the eight RG6 cables will require a 2 inch
diameter conduit, and the total cable will weigh
approximately 900 pounds, or 400 kilos. These same
cameras can be connected to the monitoring station
with a single strand of multimode fiber, that is
3 millimeters in diameter, weighs less than 4 kilos
(9 pounds) and can fit in a ½” conduit. This same
fiber can be used bi-directionally to deliver pan/tilt/zoom
commands to the camera mounts and lens, and transmit
access control data for door control. Fiber has
much greater bandwidth, and is smaller than comparable
quantities of copper coax. Also, a 300 meter roll
of fiber is much less expensive than the eight 300
meter rolls of coax copper needed to connect the
cameras. |
| Here
is an example of the ability of fiber optic systems
to be easily and quickly upgraded. Here is a four
camera system, connected via fiber from one building
to another. Let’s assume that there is only one
fiber strand available to connect the remote cameras
to the monitoring station. What if the client decides
he wants two more cameras in the remote building?
Will it be necessary to install a new fiber cable,
digging up the parking lot in the process? |
Instead
of a costly and time consuming cable installation,
the transmitter and receiver can be upgraded to
carry the additional cameras requested. This concept
will also work for the customer who wants to add
access control commands, data, voice, virtually
any combination of signals can be connected to
the fiber strand.
Because
fiber is made of silica glass, it does not corrode
as will copper cable. |
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| LESSON
REVIEW |
Key
Points:
1.
Fiber is smaller, lighter, and easier to install than comparative
copper cabling.
2.
Fiber can carry multiple signals on a single strand of glass.
3.
Fiber is made of glass and will not corrode over time.
4.
Fiber systems can be easily upgraded by changing the optoelectronic
devices.
5.
A single fiber can carry signals bi-directionally at the same
time.
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Pop
Quiz:
True or False
A maximum of six CCTV cameras can be connected to a single
fiber strand.
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Key
Terms:
1.
RG6
2.
CCTV |
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