Friday, December 19, 2014
Tuesday, December 2, 2014
Basic Things to Know About CCTV as a Technician
Some Basic Things to Know About CCTV as a Technician, If you are
manager just share this with your team.
Cable Running
Many facilities use closed circuit television
(CCTV) as part of an overall security system. Cameras mounted on buildings or
ceilings transmit signals to a central monitoring room. CCTV takes two forms
---hard-wired or wireless. A technician just starting out in CCTV has to gain a
knowledge base of how CCTV works, so he will be able to install, test and
troubleshoot systems. Do not run 3+1/4+1 CCTV Cable, use RG11, RG6, RG59
only. Find-out the length of Video Cable from DVR to Camera, it
should be on limit. Do not overlapping with High voltage wire.
Do not join the Video Cable, use complete length ( One drum Video Cable its
305Mtr) of wire. If cable layed in out door use Armour cable.
Twisted pair cable is a good alternative to coaxial cable if the length
of the run is more than a few hundred metres. With pure cooper twisted pair, runs of up to 600 metres can be used without any in-line repeaters.
RG 59 which can transmit signals up to 200 metres. This distances
are for a single run of cable with no amplifiers or in-line correctors.
RG 11 which can transmit signals up to 270 metres. It is more expensive because it is thicker. This distance are for a single run of cable with no amplifiers or in-line correctors.
RG 6 which can transmit signals up to 400 metres. It is more expensive because it is thicker. This distances are for a single run of cable with no amplifiers or in-line correctors.
RG 11 which can transmit signals up to 270 metres. It is more expensive because it is thicker. This distance are for a single run of cable with no amplifiers or in-line correctors.
RG 6 which can transmit signals up to 400 metres. It is more expensive because it is thicker. This distances are for a single run of cable with no amplifiers or in-line correctors.
Troubleshooting Signal Loss
The picture on the monitor should never be fuzzy or have
interference patterns. If it does, signal loss is occurring somewhere in the
system. Technicians have specialized testing equipment and know how to use them
in order to troubleshoot systems. Usually, a technician starts at the camera
and works her way back to the receiver. She/he checks each connection until the
test equipment indicates a loss. Some common problems are corrosion due to
moisture inside the connectors or cables chewed through by animals.
Camera Installation
CCTV technicians can't be afraid of heights. Cameras are mounted
high on the sides of buildings, or high in the ceiling areas of stores. You
have to use a boom lift to reach spots to mount cameras. If you suffer from
heights, becoming a CCTV Technician may not be a valid career path.
Cables are installed from the camera to the receiver station. You
will have to drill through masonry block and below floor to run the cable. Be
prepared to navigate through tight cramped quarters to get the cable from the
camera to the receiver. Bring along a change of clothes, since you will get
dirty in the process.
CCTV Camera Installation Tips:-
1. Test all equipment
before installation. Therefore equipment can be replaced before arrival on-site
if needed.
2. Ensure the mounting brackets of outdoor speed domes are properly sealed to prevent condensation in the camera housing.
3. Ensure sufficient space for camera, lens and connectors when choosing camera housing.
4. Avoid direct sunlight on equipment as it raises the temperature of the equipment.
5. Position cameras out of reach of vandals or 'curious' people.
6. Mount good quality mounting brackets in a stable location to avoid unstable or vibrating images caused by vibration or wind.
7. CS Mount cameras placed inside, at industrial or dusty/damp installations should be placed into outdoor camera housings.
8. Avoid installing cameras too high above the subject thus preventing 'top-of-head' video images
9. Ensure camera mounting poles are mechanically secure to avoid vibration on camera images
10. Before connecting power, ensure the supply is 12VDC regulated.
2. Ensure the mounting brackets of outdoor speed domes are properly sealed to prevent condensation in the camera housing.
3. Ensure sufficient space for camera, lens and connectors when choosing camera housing.
4. Avoid direct sunlight on equipment as it raises the temperature of the equipment.
5. Position cameras out of reach of vandals or 'curious' people.
6. Mount good quality mounting brackets in a stable location to avoid unstable or vibrating images caused by vibration or wind.
7. CS Mount cameras placed inside, at industrial or dusty/damp installations should be placed into outdoor camera housings.
8. Avoid installing cameras too high above the subject thus preventing 'top-of-head' video images
9. Ensure camera mounting poles are mechanically secure to avoid vibration on camera images
10. Before connecting power, ensure the supply is 12VDC regulated.
CCTV Cabling Tips:
1. Avoid running video cable parallel to AC power cables,
especially those carrying high current.
2. RG59U Coax runs should not exceed 180m for colour and 280m
for B/W
3.Avoid sharp bends when cabling
4. Avoid cable joins and using BNC barrels
5. Avoid over-tightening cable-ties
6. Ensure use of proper co-ax wire-stripping and crimping tools
7. Ensure BNC Connectors are properly crimped
8. Use Rubber BNC Boots after crimping to protect crimped area and
bend radius
9. Mark or label camera and data signal cables
10. Outdoor cable runs should be housed in UV-proof conduit
11. In lightning prone areas, install surge protection devices
Final Testing and Teaching
A technician tests the system after it's installed. This involves
knowing how to aim the cameras, knowing how to operate the monitoring equipment
in the security room and knowing how to instruct the final operators of the
system. You have to be part teacher. You may have to deal with people who have
no knowledge of how a CCTV system is operated, so you have to use
layperson-friendly language during the training process.
As you are a Engineer / Technician remember this few points:
Visually inspect all major components and connections for signs of deterioration or damage
As you are a Engineer / Technician remember this few points:
Visually inspect all major components and connections for signs of deterioration or damage
Check all control equipment (DVRs, VCRs, monitors, multiplexers, video switchers, telemetry units etc) for correct operation
Check mains & power supplies and stand-by batteries including charging rates.
Check environmental conditions for adverse effects, including growth or shrubbery obscuring camera views
Check time and date settings in equipment and update the settings as appropriate
Check integrity of all cabling and sample check external insulation for damage
Clean cable fixings for security
Check auxiliary lighting equipment, infra-red units and photocells (if any) for correct operation
Check air vents are clear in all control equipment including PCs
Clean cameras, lenses and housing surfaces as necessary
Check al glands and seals on external equipment
Clean control equipment surfaces including PC (if applicable)
Establish regular back-ups are taken
Check camera is aligned to user specification, pictures for correct field of view and adjust as necessary
Check brackets, towers and fixings for corrosion or damage. Check clamping bolts/brackets are tightened correctly
Check wash/wipe units and wiper blades (if any) for correct operation and fill washer reservoir where necessary
Check quality of recording during day time and night time modes
Check pan and tilt assembly (if any) including fixings, electrical connections and functions.
Check the satisfactory CCTV transmission of images to remote site (if applicable)
Check warning signs are in place
Check all camera presets
Check all alarm presets
Wednesday, November 26, 2014
PoE network camera in Global market
Development of PoE network camera in Global market
Since the launching
of Power over
Ethernet (PoE) standard, global enterprise are eager to utilize this
emerging technology in just a few years. According the latest survey, in just
six years from 2008 to now, the annual increasing rate of power equipment with PoE
technology will reach 33%. In 2014, global market of power devices with PoE
technology will be over $5.2 billion, compound annual growth rate will be 38%.
Along with the
development of worldwide security market, users start to consider deploying
some network cameras and other network security devices. Network surveillance
based on PoE is more and more accepted by users and have great development.
PoE (Power over
Ethernet) means keeping the current Ethernet cat-5 deployment, assure interface
AP for wireless network security cameras and other IP signal devise based on IP
signal, at the same time, it is able to power ac electric for those kinds of
devices. PoE technology use one general Ethernet cable to transmit Ethernet
signal and ac electrical source simultaneously, allowing power and date to be
integrated into the same cable system. In the case of guaranteeing the
construction cable safety, keep normal answer operation. PoE network camera use
PoE technology to realize the network video surveillance, which has power device
function to use direct current main provided by power device equipment to
transmit to power device via twisted-pair.
Compared to normal
network camera, PoE network camera has following advantages: apart from power
the connected device through Ethernet cable, PoE reduce the investment cost, as
a result, it decrease the overall the deployment costs to organize
the device based on IP infrastructure. Poe not only provide the need for
installing wall power connection, which dramatically reduce the plug costs
related supporting end devices but also install the network connection device
on the place where is hard to deploy the local alternating current power
supply, to some content, provide more flexibility. We can separate PoE
network camera form power device end in the practice, which can be divide
into two types, normal cameras and PoE adaptor. Front end has Ethernet
switch for PoE power, and back end has PoE adaptor, which will transmit the
twisted cable power to network camera for the working power. Because power
device is able to identify the rate of power, when we use ups to power, the
advantage of saving energy is more obvious.
About Wireless Hacking
About
Wireless Hacking
Wireless networks broadcast their packets
using radio frequency or optical wavelengths. A modern laptop computer can
listen in. Worse, an attacker can manufacture new packets on the fly and
persuade wireless stations to accept his packets as legitimate.
The step by step procedures in wireless
hacking can be explained with help of different topics as follows:-
1) Stations and Access Points :- A wireless network interface card (adapter) is
a device, called a station, providing the network physical layer over a radio
link to another station.
An access point (AP) is a station that provides frame distribution service to
stations associated with it.
The AP itself is typically connected by wire to a LAN. Each AP has a 0 to 32
byte long Service Set Identifier (SSID) that is also commonly called a network
name. The SSID is used to segment the airwaves for usage.
2) Channels :- The stations communicate with each other using radio frequencies
between 2.4 GHz and 2.5 GHz. Neighboring channels are only 5 MHz apart. Two
wireless networks using neighboring channels may interfere with each other.
3) Wired Equivalent Privacy (WEP) :- It is a shared-secret key encryption
system used to encrypt packets transmitted between a station and an AP. The WEP
algorithm is intended to protect wireless communication from eavesdropping. A
secondary function of WEP is to prevent unauthorized access to a wireless
network. WEP encrypts the payload of data packets. Management and control frames
are always transmitted in the clear. WEP uses the RC4 encryption algorithm.
4) Wireless Network Sniffing :- Sniffing is eavesdropping on the network. A
(packet) sniffer is a program that intercepts and decodes network traffic
broadcast through a medium. It is easier to sniff wireless networks than wired
ones. Sniffing can also help find the easy kill as in scanning for open access
points that allow anyone to connect, or capturing the passwords used in a
connection session that does not even use WEP, or in telnet, rlogin and ftp
connections.
5 ) Passive Scanning :- Scanning is the act of sniffing by tuning to various
radio channels of the devices. A passive network scanner instructs the wireless
card to listen to each channel for a few messages. This does not reveal the
presence of the scanner. An attacker can passively scan without transmitting at
all.
6) Detection of SSID :- The attacker can discover the SSID of a network usually
by passive scanning because the SSID occurs in the following frame types:
Beacon, Probe Requests, Probe Responses, Association Requests, and
Reassociation Requests. Recall that management frames are always in the clear,
even when WEP is enabled.
When the above methods fail, SSID discovery is done by active scanning
7) Collecting the MAC Addresses :- The attacker gathers legitimate MAC
addresses for use later in constructing spoofed frames. The source and
destination MAC addresses are always in the clear in all the frames.
8) Collecting the Frames for Cracking WEP :- The goal of an attacker is to
discover the WEP shared-secret key. The attacker sniffs a large number of
frames An example of a WEP cracking tool is AirSnort (
http://airsnort.shmoo.com ).
9) Detection of the Sniffers :- Detecting the presence of a wireless sniffer,
who remains radio-silent, through network security measures is virtually
impossible. Once the attacker begins probing (i.e., by injecting packets), the
presence and the coordinates of the wireless device can be detected.
10) Wireless Spoofing :- There are well-known attack techniques known as
spoofing in both wired and wireless networks. The attacker constructs frames by
filling selected fields that contain addresses or identifiers with legitimate
looking but non-existent values, or with values that belong to others. The
attacker would have collected these legitimate values through sniffing.
11) MAC Address Spoofing :- The attacker generally desires to be hidden. But
the probing activity injects frames that are observable by system
administrators. The attacker fills the Sender MAC Address field of the injected
frames with a spoofed value so that his equipment is not identified.
12) IP spoofing :- Replacing the true IP address of the sender (or, in rare
cases, the destination) with a different address is known as IP spoofing. This
is a necessary operation in many attacks.
13) Frame Spoofing :- The attacker will inject frames that are valid but whose
content is carefully spoofed.
14) Wireless Network Probing :- The attacker then sends artificially constructed
packets to a target that trigger useful responses. This activity is known as
probing or active scanning.
15) AP Weaknesses :- APs have weaknesses that are both due to design mistakes
and user interfaces
16) Trojan AP :- An attacker sets up an AP so that the targeted station
receives a stronger signal from it than what it receives from a legitimate AP.
17) Denial of Service :- A denial of service (DoS) occurs when a system is not
providing services to authorized clients because of resource exhaustion by
unauthorized clients. In wireless networks, DoS attacks are difficult to
prevent, difficult to stop. An on-going attack and the victim and its clients
may not even detect the attacks. The duration of such DoS may range from
milliseconds to hours. A DoS attack against an individual station enables
session hijacking.
18) Jamming the Air Waves :- A number of consumer appliances such as microwave
ovens, baby monitors, and cordless phones operate on the unregulated 2.4GHz
radio frequency. An attacker can unleash large amounts of noise using these
devices and jam the airwaves so that the signal to noise drops so low, that the
wireless LAN ceases to function.
19) War Driving :- Equipped with wireless devices and related tools, and
driving around in a vehicle or parking at interesting places with a goal of
discovering easy-to-get-into wireless networks is known as war driving.
War-drivers (http://www.wardrive.net) define war driving as “The benign act of
locating and logging wireless access points while in motion.” This benign act
is of course useful to the attackers.
Regardless of the protocols, wireless networks will remain potentially insecure
because an attacker can listen in without gaining physical access.
Tips for Wireless Home Network Security
1)
Change Default Administrator Passwords (and Usernames)
2) Turn on (Compatible) WPA / WEP Encryption
3) Change the Default SSID
4) Disable SSID Broadcast
5) Assign Static IP Addresses to Devices
6) Enable MAC Address Filtering
7) Turn Off the Network During Extended Periods of Non-Use
8) Position the Router or Access Point Safely
Lets find out how best to protect your system from online
attacks.
a)
First up don’t allow your CCTV system to
respond to a ping request. You don’t want any other internet device to be able
to see if your device can “talk” to it. You will be the only one able to do
this once you log in to your password encrypted software. Turn the option to
receive Pings off in your DVR (digital video recorder) and also in your router.
You can also change the port names on the DVR if allowed.
b)
If this function is not feasible, alter
the router setups to utilize Port Forwarding, so that web traffic on a certain
inbound port number will be sent to the appropriate port of the DVR
on your network.
c)
As mentioned above modify the password on the
CCTV System with lower and uppercase leTter$ + $ymb0ls- THIS IS A NECESSITY. Make it super
complicated.
d)
See to it that you regularly update
the firmware on the CCTV System to keep it up to day with the latest
security threats. Manufactures will regularly update their software to
counteract new threats they have detected.
e)
Configure your router’s Firewall software–
Unless you want to give any person on the web access to your CCTV system. With
the firewall program that comes along with your router you can also ban
particular IP (Internet Protocol) and MAC (computer identification
nodes) addresses from accessing your CCTV system.
Monday, November 24, 2014
To 4K or not 4K video or Ultra HD
To 4K or not to 4K video or Ultra HD
Our industry’s seemingly insatiable appetite for more and more
resolution has now produced a wave of interest in 4K cameras that promise
exceptional clarity and sharpness, akin to the big screen, Ultra HD television
sets found in consumer electronics stores and an increasing number of North
American homes.
The jury is still out on whether there is an immediate need for
the resolution that can overcome the downsides of increased storage and
bandwidth required for running 4K cameras in a surveillance operation. Like so
many things, if the cost of the camera, cost of the supporting system
infrastructure and components were of no concern, this new format would likely
be a more viable and attractive option for many security applications.
Here are four things to consider before making the leap to
investing in and deploying 4K video:
1.
What will I get with 4K that is not possible at lower resolution?
There’s no
doubt that 4K technology is light years ahead of analog quality, but the
reality is that the increased clarity and sharpness provided by that level of
resolution is often over and beyond what is required and able to be managed by
a typical security operation. For many reasons, full HD/1080P is the most
commonly used resolution for new systems. The majority of security systems in
use for live monitoring situation do not really benefit from such a resolution,
as the human eye is well served with the details of a 1080P picture. Higher
resolutions pay out when more details are required in forensic investigations.
2.
Double the resolution, double the processing requirements
Users
typically want to see more than one camera on one monitor, and only
occasionally switch to full screen modes. With 4K, the clarity of that
multi camera view would be no clearer than what would be viewed from a lower resolution
camera. In addition, delivering streams from multiple 4K cameras presents some
technical challenges. The client PC and graphics card must handle a significant
flow of data. The best approach is to have the live view limited to only enough
resolution for the video size and screen resolution of the display.
3.
Limitations on form factors, lenses
The
availability of affordable high resolution optics is just not there yet, and a
dome style camera with a typical curved dome bubble cannot transmit the 4K
resolution. In addition, a true 8MP resolution lens with appropriate coverage
for the 4K sensor is quite large, which would render a 4K version of the
compact dome camera (the market’s favorite form factor) essentially not
possible. The dome camera would get physically bigger which, for many
customers, is a negative.
4.
Bandwidth and storage requirements
From a cost
perspective, quadrupling the resolution from full HD to 4K won’t quite double
the camera price. However, on the recording side it will most definitely demand
more than double the storage requirements when operating under the same conditions.
So where does this leave you, 4K today or not just yet? For some
customers a bigger number is frequently perceived as a better solution but
surveillance installations should focus on the reason the system investment is
being made in the first place; protection of personnel and protection of
assets. It is far from a one size fits all decision and resolution is an
important tool in the system solution.
Next benchmark for video surveillance cameras
is going to be the Ultra HD standard, with a resolution of 3840 x 2160 –
around 8MP. Given the challenges networks may face carrying Ultra HD video
streams it’s hard to say just when we will see the technology reach a tipping
point.
THERE are a
couple of signs worth paying attention to with Ultra HD (commonly called 4K in
consumer and CCTV industries). The first is that UHD consumer monitors, which
are now dropping in price at a time many homeowners’ first 1080p HD monitors
may be starting to look a little tired. Something else to bear in mind is the
consensus forming in digital photography that 8MP is the sweet spot that allows
the best balance of low light performance and high resolution.
As most
readers know, the more pixels you cram onto an imager, the smaller those pixels
must be. And the smaller the pixels, the less light they can absorb. Double the
number of pixels on a 1/3-inch HD sensor and you halve the light reaching the
sensor. The result is that more pixels does not a perfect camera make – not
unless sensor sizes increase. If it’s all about display images today, then 3MP
cameras with a 1080p resolution are ideal.
But if you
need digital zoom or you use a UHD monitor, then Ultra HD cameras should be a
consideration. If you zoom in 2x digital with an Ultra HD image then you are
viewing at 2MP, which is pretty good considering how quickly it takes an HD
camera to burrow down under 4CIF when digital zoom is applied.
Something
else to bear in mind when considering digital image quality is that pixels on a
digital camera’s sensor capture light in red, blue or green – not all colours
at once. A layout will be a pair of green, a red and a blue in a grid pattern
and onboard software then nuts out the colour value for pixels. This means
there’s signal attenuating averaging going on in the background - one colour
per 4 pixels.
A camera’s
digital engine is also working hard to stave off false colours and moire –
spacial aliasing that causes false patterns in a scene. Camera engines will
blur an image slightly then sharpen it in order to lose such artifacts.
Clearly, the more pixels, the more work the camera processor has to get through
and this can be noticeable as latency or blurring if there’s sudden movement –
like cars moving at right angles across a scene.
Lenses are
another issue. An Ultra HD camera is going to need a quality lens and there’s
no doubt that plenty of 1080p cameras are being sold with lenses that are not
perfect. Sure, things look good in the centre of the image but out towards the
edges details get muddy, especially on the sorts of deep zooms that might
motivate a buyer to choose Ultra HD in the first place.
Sensor noise
is also something that has to be considered at multiple levels. In low light,
cameras increase exposure, elevating noise levels. Furthermore, pixel
measurements are never perfect and the flaws in these signals show up on a
monitor as noise. It’s unhelpful during the day and blinding at night. Digital
noise reduction is the answer but DNR processing doesn’t just lose noise, it
sloughs fine detail off a scene. When you look at a camera being tested in low
light you can often see the areas where DNR has scrubbed and smudged a scene
free of detail. It’s not a good look.
Engineers
can build high resolution imagers with fewer noise problems but they need to be
big – 1-inch or 1/1.5 inch sensors are ideal. A 1/1.5-inch sensor has 4x the
area of the 1/3-inch sensors that typically run inside 1080p CCTV cameras. No
wonder GBO’s S1080 camera (BGWT sells them in Australia) with its monster
1-inch sensor has such a great image in low light.
If the
sensors are large enough, the lenses are good enough, the network is capable
enough and the storage sufficient, then Ultra HD cameras will give end users a
lot more detail than 3MP 1080p cameras can. But this capability has to be
balanced against many things. Image quality is about more than megapixel count.
“If a sensor is of the similar size as the
equivalent HD sensor and it has 4x the pixels - low light performance will be
4x lower. And streaming bandwidth will be close to 4x larger unless better
compression is used”
Keep in mind,
4K = 8.3 megapixels, aspect ratio 16:9
Horizontal resolution
1080p= 2.1 megapixel, aspect ratio 16:9
Vertical resolution
720p= 1.3 megapixel, aspect ratio 16:9
Vertical resolution
D1= 0.4 megapixel, aspect ratio 4:3
Vertical resolution
Saturday, November 15, 2014
Site Surveys Planning for Your Customer
Site Surveys – Planning for
Your Customer
Most of us have heard the old saying “Prior planning prevents poor
performance” and nowhere is it more important than planning out a Video Surveillance System & Access Control System. Taking time upfront to make sure your survey is complete
and accurate will save great amounts of time, money and energy for your
installers, making both you and the customers bottom line better.
Making the sale and picking the right product are only parts of the puzzle.
Camera placement, lens selection, mounting options and cable planning are all
equally important to the success of a job. These elements will also help you
gain the loyalty of your customer. If you’re a salesman, project manager or an
estimator, at some point you’re going to have to put a project together and it
will help if you know what to look for.
Of all the various parts of a CCTV system & Access Control System, the
one thing the customer is going to notice above all else is a picture that doesn’t
meet his expectations. He won’t care what kind of cable you used to get the
picture in front of his eyes, nor will he worry about whether there’s a space
in between each piece of equipment mounted in a rack. But he will know right
away if he can’t see what he thought he was going to see or if what he can see
is out of focus.
Picking camera and lens combinations are one of those areas that have become
far easier over time. More sensitive cameras and varifocal lenses have taken
most of the work out of the selection process. EM Lock installation has taken
most of the work out of the selection process. It is still important however to
have a good grasp of the concepts.
Focal length of a lens refers to two main things, the distance a lens can
see clearly and the width of the scene a particular lens can see. Focal length
is rated in millimeters. The lower the millimeter number, the wider the scene.
As you go higher in millimeters, the lens becomes more telephoto and the scene
width is greatly reduced. Taking the time to pick the right camera and lens
combination will make for a smoother install and a happier customer and reduce
the need for return visits.
One aspect of a site survey and system design that is frequently over looked
is the environment itself. Not only conditions like temperature and weather
extremes, but also physical aspects of the environment. I was recently out at a
customer’s site looking at a parking lot through the view of his cameras. The
customer told me the view was good now but in the spring when the trees bloom
he cannot see anything. His system was installed in the winter when all the
trees were bare. Please remember that trees grow. Those newly planted saplings
will become towering oaks in a few years. Make sure they won’t impede your view
now or ever.
Physical obstruction aren’t only limited to the great outdoors. Warehouses
are notorious for large shelving and stacks of product. Shelves and products
are subject to reconfiguration at any time. Make sure your camera placement is
high enough so that it doesn’t get blocked by a stack of boxes.
It seems obvious to take things like that into consideration but I can tell
you it doesn’t always happen that way. In times like we are experiencing today
the need to get in and out of a project quickly becomes very important to the
bottom line, but we can’t let it compromise the integrity of our system design.
Sunday, October 26, 2014
HD-TVI, HD-CVI, HD-SDI, HD-AHD, Analog & IP Camera
HD-TVI, HD-CVI, HD-SDI, AHD, Analog &
IP Camera
Even we enter into digital
era, analog surveillance technology doesn't stop its innovation. Besides the
HD-SDI and HD-CVI (in house technology of Dahua), today the Hikvision and other
camera manufacturers announce HD-TVI cameras release. HD-TVI means High Definition Transport Video Interface, HD-TVI
is based on traditional coaxial cable for video and data transmission, it
supports not only 720P/1080P video signal, but also including audio, data
signal over long distance up to 500 meters.
At present, there are
approximate 100 million coaxial cables are deployed for analog camera
connection. In the next 3-5 years, they will be replaced with high definition
camera. However, some users start to worry they have to rewire, re-install or
add new network devices for upgrading. This group of users prefer the
economical and easy solution to upgrade existing system to HD, rather than
adopting the IP camera. In this context, the HD-SDI and HD-TVI technologies
were born.
HD-TVI advantages
500 meters long range video transmission:-
As we know, HD-SDI and
conventional analog solutions only has limited 100 meters video transmission.
Additionally, the cost of HD-SDI equipment is more expensive. The HDTVI
technology (HikVision) offers long range distance video transmission at
1080P/720P through coaxial cable. The cost of HD-TVI products is very
affordable, permit users upgrade the system with minimum investment. This makes
HDTVI become a perfect solution to fit all analog surveillance applications.
Furthermore, the new HDTVI technology support UTC function which
can allow user to remotely control the OSD menu and PTZ control via coaxial
cable. This means user can quickly install and adjust the camera without
accessing the camera itself.
 |
| HDTVI Camera with CS 4mm lens |
Analog high definition resolution at 720P/1080P:-
Similar to HD-CVI (in
house technology from Dahua) and HD-SDI, the new HDTVI cameras can deliver real
time 720P/1080P HD resolution video without video latency. The HDTVI DVRs
support full time 720P/180P video recording and playback. Through using HDTVI
compatible cameras and DVRs, user can setup a complete new HD analog
surveillance system or easily upgrade the existing conventional analog system
to HD surveillance system.
 |
| HDTVI Camera with CS 12mm lens, |
Broad manufacturers to offer great compatibility:-
HDTVI equipment is HDTVI
open standard, which guarantees trouble-free connection to other
HDTVI-compliant cameras and DVRs. By the way, the new designed HDTVI DVR also can support traditional standard video
camera for offering great flexibility. All HDTVI HD cameras can access
third party DVRs equipped with HDTVI technology from other manufacturers. The
main HDTVI members including TVT, Hikvision, Hisharp, Unifore, LSVT...etc.
HD-TVI vs Analog
In summary, the advantage
of HD-TVI compared with Analogue is:
1.
HD resolution on
720P/1080P at 25/30fps
2.
Long distance
transmission for HD video
3.
No video quality
loss and delay for transmission
HD-TVI vs HD-CVI
Obviously, HD-TVI and
HD-CVI have very similar features, both of them can provide analog high
definition solutions. HD-TVI derives from American based company that does not
supply to only one manufacturer. Therefore we are expecting many analog camera
manufacturers will release wide range of HD-TVI based cameras to market.
Therefore, HD-TVI is more likely to become an industry standard, not a
proprietary technology/solution.
HD-SDI vs HD-CVI
HD-TVI vs HD-SDI
In conclusion, compared
with HD-SDI, new HD solution with advantages of:
1.
Longer video
transmission distance up to 1000ft (300m) over regular coaxial cable
2.
700ft (200m)
distance for video transmission over UTP (Cat5, twisted cable)
3.
More cheaper
price for analog HD system
4.
Support twisted
cable installation
HD-TVI vs IP Camera
Hence, compared with IPC,
the advantages of HD-TVI are
1.
No network
bandwidth requirement/influence
2.
No network
configuration, as easy as analog system
3.
No video quality
loss and compression
4.
No video latency
issue, real time live-view
5.
Long video transmission
distance
6.
More affordable
price for camera and video storage devices
AHD advantages
A new kind of camera: AHD
Camera (Analog high definition)/HD-AHD is developing so soon in the market now.
The price is similar as Analog camera and the image effect is similar as digital camera!
The price is similar as Analog camera and the image effect is similar as digital camera!
The Advantages of AHD Camera:
1) AHD Camera can link with general DVR and the resolution is looks like 1000tvl analog cameras.
2) AHD Camera can link with AHD DVR, and the resolution is Megapixel High Definition ( Now have 1MP, 1.3MP already).
3) Transmit by Coaxial cable-500m!!
4) The price is similar as Analog system no matter considering DVR or camera.
1) AHD Camera can link with general DVR and the resolution is looks like 1000tvl analog cameras.
2) AHD Camera can link with AHD DVR, and the resolution is Megapixel High Definition ( Now have 1MP, 1.3MP already).
3) Transmit by Coaxial cable-500m!!
4) The price is similar as Analog system no matter considering DVR or camera.
HD-CVI cameras vs HD-AHD cameras
1.
1.0 megapixel AHD
camera adopts OV9712 + NVP2431H solution (CMOS Chip: OV9712 & DSP
Chips : Nextchip NVP2431H), while HD-CVI camera adopts the PO3100K +
DH9801 solution. In addition to the difference of solution, the price vary
greatly, OV9712 + NVP2431 of AHD camera module only costs US$7.5, and PO3100K +
DH9801 camera module costs approximate US$11.
2.
AHD camera can
connect to CRT display directly, the image can display properly. HD-CVI camera
connects to traditional CRT, it doesn't show images. For video live
view/recording/playback, HD-CVI cameras need to work with HD-CVI DVR. It seems,
the HD-AHD cameras support 960H output mode, which is very convenient for test
and installation. Since the AHD cameras can be backward compatible with all
traditional analog equipment. Compared with HD-CVI, it has advantages of great
compatibility.
3.
Competiable
with normal D1 / 960H, and analog peripherals (including distributors,
matrix, etc.). Switch AHD, IP and
Anolog video signal from AHD DVR in no time.
4.
Strong
anti-interference capability & solid interface protection that can avoid
space high frequency electromagnetic radiation to ensure a constant signal
transmission of high definition video display without problems as frame drop
and lock loss occurred.
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