Transcript
UTP GOES THE DISTANCE FOR CCTV compare signal quality of “best case”
UTP cable out to the security
RG-6U type coaxial cable with Berk-
cameras instead of time-honored
Tek’s LANmark-350 (Category 5e) and
coax. With the development of
LANmark-2000
(enhance
OUTSIDE REELPLANT TIME
T
he big buzz in CCTV is running
Category
digital video, and other analog signal
6) UTP cables. The purpose of this
conversion hardware, running CCTV
test procedure was to compare the
over other media, such as twisted pair
video quality and signal output of these
has progressed. Deploying CCTV over
cable types.
UTP offers many advantages. It is smaller in design, easier to terminate and
TEST SCENARIO
does not require a separate cable for
The two main types of security cam-
remote camera power. PoE (Power over
eras are fixed or Pan/Tilt/Zoom (P/T/Z).
Ethernet) or a midspan Power Injector
The DCCC selected an indoor analog
can provide power to the device using
P/T/Z camera from Pelco because of its
the same UTP cable as the video and
flexibility. Pictures were captured under
data telemetry.
standard indoor lighting to compare
UTP cable is also TIA/EIA-568-B
visual quality. In addition, output signals
compliant, which will enable an easy
were measured using a Lecroy oscil-
migration path to video over IP. By
loscope to show the variation of the
installing a UTP-based system today
received signal strength over the cable
will mean that your cable plant will be
distance.
ready to accept any converging devices
Three distances were used to
to your existing network without having
benchmark CCTV applications: 328 feet,
to replace the cable. Only the devices, such as the cameras, will need to be replaced and updated. It is necessary to note that when running video over the IP network, the length must be kept to 328 feet, per the TIA industry standards. However, longer runs can be installed, when needed for analog cameras not running over IP and UTP can perform as well, or better, at any distance. Through the use of transceiver technology, many existing analog cameras can utilize UTP for increased
750 feet and 3,000 feet. Normally when using coaxial cable the camera output goes through the cable directly to the DVR (Digital Video Recorder) or monitor. Average distance for coax is 300-500 feet and any lengths longer than 1,000 feet require a equalizing amplifier to boost the signal. Transmitting over the UTP cable required the use of a video transceiver, such as Network Video Technologies’ NV-218A-PVD, which was used to convert the unbalanced analog
“REEL TIME” ADDRESSES CABLE TOPICS INCLUDING BOTH COPPER AND FIBER CONSTRUCTIONS, APPLICATIONS, INSTALLATION PRACTICES AND STANDARDS UPDATES. IF YOU HAVE A PARTICULAR CABLE ISSUE, PLEASE SEND AN E-MAIL TO: CAROL.
[email protected] AND WE WILL FEATURE THE SOLUTION IN AN UPCOMING ISSUE.
signal to a balanced signal for transmis-
cameras with smaller pathways (than
sion over twisted pair cabling. At longer
traditional CCTV coax) and produce an
distances (750 and 3000 feet) for UTP,
improved picture at higher distances.
the NV–862J active hub was used at the
BY CAROL EVERETT OLIVER, RCDD
(Data
receive end for distance equalization
BERK-TEK, A NEXANS COMPANY
Communications Competence Center)
adjustments needed to compensate for
The
Nexans
DCCC
at Berk-Tek’s New Holland, PA, facil-
line loss and to capture the image out-
ity recently conducted several tests to
put at the DVR. Cabling Business Magazine • August 2006 • Celebrating 15 Years!
www.cablingbusiness.com
cable plant capacity, for attaching more
37
CABLE COMPARISON RESULTS Most RG-6U coax cables are constructed with 18 AWG copper as compared to Category 5e with 24 AWG and enhanced Category 6 with 23 AWG construction. The gauge affects the amp carrying capacity. For CCTV, this is very
REEL TIME
important for both the signal carrying capability and also if power is deployed
Coax
LANmark-350 (Category 5e)
coax has a larger gauge size, it is a
equipment, cameras can transmit over
per conductor gauge of the Category
single conductor and can not distribute
significant distances with very little sig-
6 cables. This can be attributed to the
power to the device without extra wires
nal loss.
over the UTP. However, even though
for power, i.e. a Siamese configuration.
improved insertion loss and return loss
To get a quantitative measurement,
With regard to visual clarity, the
signal strengths were checked using
UTP cables performed as well as the
the Lecroy oscilloscope. The signal
compared to Category 5e.
TRENDS FOR CCTV
coax cable in the 328 feet distance, but
decreased in amplitude with increas-
showed better performance at 750 feet
ing distance for both UTP and coax,
and was significantly superior at the
Running security cameras over UTP
yet according to the visual results, it
3,000-foot range mainly because UTP
will not only increase the signal and pic-
is evident that video over UTP can be
is an inherently balanced cable backed
transmitted for longer distances.
ture quality (for both analog and digital
by years of development and standards.
The visible difference in the received
When using active components the sig-
image quality between the enhanced Category 6 and Category 5e at longer distances is likely due to the larger cop-
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nal is fully equalized at the receive end. In addition, deploying UTP with active
Circle Reader Card #127
38
performance of Category 6 cables when
Cabling Business Magazine • August 2006 • Celebrating 15 Years!
video signals), but advantages of running CCTV over UTP cable also include: •
UTP is balanced cable with crosstalk immunity
•
Offers
a
perfect
technology
migration path, futureproofing the cabling plant •
Integrates with existing Ethernet- of twisted pair, to provide the foundabased communications systems for work
•
security integrators can install an CCTV Cabling infrastructure for tomorrow with
UTP offers high bandwidth capabili- transport protocol as more and more devices converge onto a common netties which will be critical to transmit
today’s dollars,” notes George Wojtan,
and store high-quality images when
work through UTP. Studies have shown
moving to IP
that the cost to install UTP cabling
One UTP cable can be used for both Power Injection) and capturing the video
•
security systems will operate. “Today’s
technology that will continue to be the
powering the device (PoE or Analog
•
Ethernet is the dominant network
tion in which both enterprise LAN and
is substantially less than the cost of
datacom market manager for Network Video Technologies. Since 85 percent of
REEL TIME
•
point toward a future for a standardized structured cabling network, consisting
video over the data/voice LAN net-
LANmark-2000 (enhanced Category 6)
All of these statistics and studies
all CCTV cameras installed are analog
installing coaxial cabling and if using
cameras and currently utilize coaxial
PoE, a 50 percent reduction in installa-
cable and connections, by installing a
tion time and expense can be realized.
transceiver with UTP cabling, existing
According to a recent industry study
systems can easily be upgraded to a
Substantial space savings in the
by FTM Consulting, UTP cabling is
pathways
projected to capture 50 percent of the
Reduced space and expense in the
cabling market for video surveillance by
equipment room, i.e. rack space for
2010 over fiber’s 31 percent and coax’s
between analog and digital IP technol-
termination equipment.
19 percent.
ogy, which is coming down the pike.
standardized structured cabling environment. The cabling becomes the bridge
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Cabling Business Magazine • August 2006 • Celebrating 15 Years!
39
