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| Tips for Selecting Cables for Video Surveillance
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HIGH-end Video Server Module board W1860
W1804 Video Server
W1802D both D1 Video Server
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W1801D single channel video server D1
W1802C both CIF Video Server
W1801C CIF single channel video server
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This as part of an article published at SDM Magazine. To
view the complete article please click here.
In almost all corners of our society
today, heightened security has become a part of daily life. All over the nation
in airports, banks, sports stadiums, casinos, theme parks, retail
establishments, hotels, hospitals, government and commercial buildings, and even
in some urban centers millions of fixed and moving video surveillance cameras
are constantly surveying the scene to recognize crime and ensure the safety and
security of people and assets. In similar fashion, increasingly sophisticated
access control systems are being deployed by private, public and government
organizations to limit access to secure areas.
Driving the growth of video
surveillance and access control system installations in addition to increased
security concerns are the technologies that have improved security systems to
the point where they are affordable, reliable and cost-effective.
According to industry analysts, digital video and off-the-shelf software
are spurring rapid adoption of integrated and networked security systems with
remote monitoring. On the access control side, the use of biometrics such as
digital fingerprints, hand or retinal scans, and mart cardsare also becoming
mainstream. Whether you select coaxial, coaxial/twisted pair composites, or
unshielded multi-conductor electronic cables to support your security
installations, it is critical to ensure that the cables you specify are designed
for the task required. Be sure to verify with the cable manufacturer that the
cables specified are UL-listed and meet all requisite industry standards, such
as those published by the National Electric Code (NEC) and the National Fire
Protection Association (NFPA).
What's
new in video surveillance systems infrastructure?
Although
traditional analog cameras are often used in security systems, the trend today
is towards digital cameras in part because they are better able to operate in
diverse lighting conditions, and produce high-quality images requiring less
storage space than videotapes. Also, digital camera users typically have more
control setting options, plus DVRs (digital video recorders) enable users to
quickly sort through the recorded images in search of a particular incident or
time period.
Two types of security cameras are currently available: Fixed
and pan-tilt-zoom (PTZ). Fixed cameras are used for focusing on stationary,
high-risk areas, such as entrances, exits, and cash registers. PTZ cameras are
used for scanning an area of activity a walkway or a gaming table, for example
and zooming in on a particular person or transaction if the situation
requires.
What's new in cabling options
for fixed and PTZ camera applications?
An increasingly popular
choice today are high-performance composite cables with a unique design (see
photo) that affixes the individual cables to a center spline, eliminating the
need for an outer, overall jacket. These cables typically include an RG-59 coax
for video, one-pair 8-AWG for power, and UTP or STP cables for control. The
jacketless, all-in-one design speeds up and simplifies installation, eliminating
multiple cable pulls. Installers need only to peel the individual cable away
from the spline to be ready for termination. There is also a trend towards using
unshielded twisted pair (UTP) composite as a cost-saving alternative to coax for
fixed or PTZ security camera applications (video, power and control). The UTP
cables are smaller in size than coaxial cables, making cabling density less of a
concern, and they are available in round and Siamese constructions and riser and
plenum versions. The UTP cables are also easier to pull than coaxes, which
speeds up installation. However, UTP cables generally require baluns to convert
their signal impedance from 100 to 75 Ohms, so this additional cost and
installation factor should be weighed. In considering the UTP option, be sure to
look for cables that are Category 5e tested and verified.
What's new in cabling for secure access control?
Composite cables allow more cost-effective security
installations, because they offer the installers of access control devices
including card readers, retina scanners and hand-scanning devices a host of
labor-saving features. In general, composite cables will decrease labor costs
because they are easier and quicker to install than bundling and pulling
individual cables. The latest in access control composite cables feature the
unique jacketless design referenced above, which offers an extra measure of
installation ease and convenience. Without the overall jacket, each individual
cable component is instantly identifiable and simply needs to be peeled away
from the center spline to be ready for termination. With these cables, breakout
versatility is assured since the individual cables can be connected to the
junction box or they can be re-routed to the application site. To ensure that
the correct cable can be identified for termination, look for color coding and
printing of the application designation, such as lock power, card reader, door
contact, and request exit (rex/spare).
Why is cable selection so important when installing
video surveillance and access control systems?
In any kind of
integrated communication system whether it is computer networking, fire and
life safety, commercial or residential security, or home automation the
long-term performance and reliability of the system is wholly reliant upon the
infrastructure that supports it. Whether the installation is large or small, a
well-engineered cabling system will deliver dividends to you and your customers
by proving capable of supporting their applications and being resistant to
downtime, data loss and system failure. Customers who decide to implement
mission-critical video surveillance and access control security systems deserve
to receive a robust cabling infrastructure that will protect their investment
and support their goal of providing security for people and assets. That's why
selecting the right cabling is such an important part of the security system
implementation process.
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