different CCTV technologies
supporting the world-wide needs of Small to
CCTV is multi-platform, giving
you many choices, so please make sure you
understand what is best for your needs.
If you aren't sure what's best, just talk to
friends that know, or call us, or check our
FAQ section - all are free options.
CCTV choices today are mostly between IP, AHD,
XVI, TVI (Hikvision), CVI (Dahua) and
Analogue, each 6 technologies have their own
advantages and disadvantages, but there is no
need for you to become confused, it is fairly
simple to understand the benefits once you
know the "polotics" involved.
N.B. While some Recorders can often run and
record any of the 6 different technologies,
you can not just swap cameras of different
technologies, so please decide your preferred
type and stick with it, for example, IP cameras
have a very different connection type (RJ45) to
CVBS camera connection (RCA). Below is a brief outline
of the different technologies currently on the market
IP (Internet Protocol) is favoured by many and
some say "it is the future" but it comes with
some expected knowledge and often has
lag-time, so if you are not into IT or need
absolutely lag-free monitoring, then maybe IT
is not for you, but if you or a friend are IT
enthusiasts, it is a great solution,
additional costs for PoE-Switches, network
bandwidth allocation etc usually never dampen
an enthusiast, that's a positive fact.
AHD stands for "Analogue High Definition" and
is by far the most popular technology for now,
it out-sells IT by about 500% because it is
also more affordable than most other types.
AHD is developed and owned by NEXTCHIP
and they have
allowed free access to the technology, so no
Royalties are involved, making AHD by far the
most popular technology at this point in time.
It is based on the original well-tried and
proven Analogue technology and modified to
avoid the restrictions of PAL and NTSC's
limited resolutions, delivering
High-Definition images over existing
cable-types (Coaxial) or over Cat-5e or Cat-6
cable through the use of Baluns.
Almost all technologies can be delivered over
Cat-5, Cat-5e and Cat-6 cables through the use
of Baluns (devices designed to convert the
signals at very thrifty prices). The type of
cable used is flexible, you can use Coaxial or
Category-x for any technology, but (naturally)
the choice of cable is still a very important
decision and may need "converters".
XVI is the newest technology on the market, it
can be considered as "AHD on steroids" because
it not only offers all the features of AHD it
also allows on-line upgrading of the cameras
as later more advanced versions are released
(all technologies evolve and improve).
stands for "Transport Video Interface" and is
a proprietory product owned by Hikvision
meaning there is most likely a "patent fee"
built into the cost of this type of system.
Hikvision is a very popular brand, it is
available to anyone and has a good reputation,
we recommend you do a price-to-feature check
to be sure.
CVI stands for "Composite Video Interface" and
is a proprietory product owned by Dahua and up
until AHD shook up the market, CVI was
charging extra for their patient, but latest
information to hand they waived that fee to
better compete with AHD, the difference
appears brand-perception; CVI enthusiasts
appear similar to followers of
N.B. Both TVI and CVI are popular and many do
not mind paying the (usually) extra cost to
have a "Brand" and the benefits depend largely
on your belief, just as some people prefer a
particular brand of TV; however, all TV's are
expected to receive all broadcasted channels,
where proprietory type CCTV is often fixed to
that particular brand and can not always be
mixed with a competing brand; what we believe
you need to look for is the quality of the
product and the resolution (High or Low
Definition) of the video recording and
reproduction - weigh up cost to feature value.
Analogue (also known as CVBS*), is the original
infinity-resolution* technology, the problem
is that using Analogue, the video has to be
converted to run on PAL and/or NTSC systems
for recording and play-back, this restricts
the resolution to the limitations of those
platforms. Analogue is considered a "spent"
technology and is unlikely to ever be reproduced
in the origional format because it's just not capable
of giving a resolution good enough for today's
expectations. CVBSis a 1950's technology introduced when
Black & White-TV changed to Colour-TV - it's old.
* Composite Video Broadcast Signal
The ever-evolving and never-resting design
engineers have developed cameras and XVR's (a
XVR can be used as either NVR or DVR) that can
be switched to record & read all
technologies, so if you want to play safe in
deciding, just ask for a 4-in-one (or
5-in-one, or 6-in-one) XVR (X = Choose the
Technology, VR = Video Recorder);
massproduction has made such solutions often
more affordable than the single-technology
* If you ask anyone about photography, they
will confirm that a analogue photo can record
infinity-resolution, the limitations are in
the way the image is captured &
reproduced, but a perfect image is possible
and can be "blown-up" to masive sizes such as
a small 35mm photo can be projected to cover
an entire Movie-Theatre Screen with clear
image - but converting such images to
electronic format is where we loose the
detail; this is why AHD appears to have the
best long-term advantage.
Choosing a IP system, you will be deploying
Network Video Recorders (NVRs) and IP-Cameras
starting at megapixel resolution.
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