Your traditional CCTV system. Tried and true analog cameras designed to be displayed on standard definition displays. While the DVRs can be displayed on high definition TVs and computer monitors, these cameras will max out at 704x480 resolution.
Analog systems run on standard RJ-59 coaxial cable and the cameras use 12v DC power.
The best quality in the industry today is the new HD-SDI technology. It combines the smoothness of analog cameras with the high-definition picture you expect from a megapixel camera. These are True HD cameras and DVRs that deliver pictures at 1920x1080 resolution.
HD-SDI cameras use pro-grade RJ-59 coaxial cable and the cameras run on 12v DC power with select cameras also support 24v AC.
IP Network systems consist of megapixel cameras that connect to a PC-based NVR system. The cameras can range from resolutions of 1280x1024 all the way up to 2560x1920. With IP cameras you can get the highest resolution image, but the disadvantage is an average frame rate lower than HD-SDI or analog.
IP cameras use Cat5 Ethernet cable, and most of them can be powered over the cable with a PoE injector.
When it come to Security
Systems, there are a lot of options. When purchasing a Security System,
it is important to know the differences in video quality and system
There are 3 different
types of technology; Analog CCTV, Megapixel IP and the newest
technology, HD-SDI. All 3 systems are capable of different video
If you only read one
thing here, Make sure it is this section!
You may have heard the terms D1, CIF and QCIF. They are DVR recording
resolutions. They refer to the size of the image be recorded. D1 is the
best quality because it offers a 704 X 480 image. CIF is about half the
size of D1, and QCIF is half the size of CIF, or 4 times smaller than
D1 Resolution: 704 X 480
CIF Resolution: 360 X 240
QCIF Resolution: 120 X 76
1 Megapixel: 1280 X 1024
2 Megapixel: 1920 X 1080
5 Megapixel: 2560 X 1920
Another area of concern is FRAMES PER
SECOND, or FPS. FPS refers to the recoding speed. 30 FPS is what the
human eye is used to seeing watching television. It is common for
security video not to be 30 frames per second. A frame rate of 15 or
7.5FPS is very popular. The following video will show you the difference
Where does Analog CCTV
perform the best?
Analog CCTV is geared towards
residential and small business. Analog cameras work the best protecting
the immediate area without trying to see to far. At large distances
Analog cameras will not hold detail. So, will Analog cameras work for
you? It just depends on what you are trying to cover. If you just need
to make sure what car is in the driveway, then analog cameras will be
fine. But, if you need to see who is driving the car from 100+ feet
away, you may want to think about digital cameras.
Where do Megapixel IP
cameras perform the best?
Megapixel IP cameras are geared
towards medium to large size business. While a lot of homeowners do use
IP cameras, most of the time they are "overkill" in the residential
setting. Megapixel IP cameras can see a lot further with good detail
compared to Analog cameras. In a retail environment, IP cameras will
show you very small detail. In a production facility, IP cameras will
show you the smallest parts rolling off the assembly line.
Where does HD-SDI perform
HD-SDI is a well rounded system and
can be used just about anywhere. Because HD-SDI uses the same standard
coaxial cable as Analog cameras, makes them a great way to upgrade to
digital without having to run all new cables. HD-SDI cameras are all 2
Megapixel (this is where true HD starts, 1920 X 1080). Just like
Megapixel IP cameras, HD-SDI cameras offer superior image quality.
Because HD-SDI uses standard coaxial cable, makes them very easy to
install. No need for a background in networking.
IP NETWORK CAMERAS
High Definition (Megapixel)
True High Definition (HDTV)
Easy to Setup
High Storage Capability
Smooth, High Detailed Video
Upgradable and Expandable
Uses Standard Pro-Grade RJ-59 Coax
Mac & PC Compatible
Runs on Cat 5 Ethernet Cable
Mac & PC Compatible
Higher Cost Than Analog
PC Only Compatibility
Homes & Small Business
Homes, Business, and Enterprise
Driveways & Carports
Assembly Lines & Warehouses
Mission Critical Locations
Entryways & Hallways
Parking Lots & Other Large Areas
Parking Lots & Other Large Areas
Camera resolution is different than DVR recoding
Now that you understand DVR recoding resolution, you should
also understand camera resolution. If you have a DVR that is capable of
producing high quality video, it would make no sense using a low resolution
camera. This is what we call a resolution bottleneck. Analog camera
resolution is measured in TV lines, or TVL. The highest resolution available
in the analog world is 700TVL. 700TVL comes the closest to matching the D1
quality we discussed earlier (D1 = a screen size of 704 X 480). Megapixel IP
cameras and HD-SDI cameras are measured in Megapixel. It is the same
measurement used in digital still cameras.
How do the Cameras Connect?
Analog cameras connect using a BNC connectors and RG59
Standard Coaxial Cable
HD-SDI cameras connect using BNC connectors and RG59 PRO Coaxial Cable
Megapixel cameras connect using CAT5 network cable.
There are length limitations for cable. For cameras using
RG59 Coaxial cable, it is not recommended to use cable longer than 150 feet. Megapixel cameras use CAT5 cable and can run several hundred feet without issue.
If your cable run is longer than 150 feet, you can use Video Balun Adapters.
These adapters allow you to use CAT5 cable on Analog cameras and allow for a
much longer run with no signal loss.
BNC Connector for Analog
CAT5 Connector for IP
BNC Connector for HD-SDI
Camera Power Supplies
So far we have talked about DVRs and cameras. Now lets talk
about camera power supplies. Like everything else, you have some options here.
Analog cameras, Megapixel cameras and HD-SDI cameras all requires their own
power. Most cameras require 12 volts of power. Some cameras require 24 volts of
power. Most Megapixel cameras can use DC power or PoE, or Power Over Ethernet,
which means the power travels down the CAT5 cable. It is very important to know
what your camera requires for power. If you use the wrong power supply you will
damage your camera, and this type of damage is not covered under warranty. Power
supplies come in different sizes.
12 VOLT DC POWER
Single 12 volt DC / 1 Amp (Wall Wart)
4 Camera 12 volt DC / 5 Amp (Wall Wart)
8 camera 12 Volt DC / 5 Amp (Wall Wart)
9 Camera 12 Volt DC / 10 Amp (Professional Distribution Box)
18 Camera 12 Volt DC / 12.5 Amp (Professional Distribution Box)
4 Channel PoE
8 Channel PoE
Camera Lens Information
The lens determines the
field of view the camera provides. Lenses range from 2.8mm to 18mm on an
average. The larger the lens size the farther it will view. The draw
back to a 12mm or 18mm lens is that the horizontal view narrows to as
little as 15 feet.
*Many of our customers require a standard fixed wide angle 3.6mm
lens. They are designed to be installed in a corner, provide a 90 degree
field of view, and provide effective surveillance in a 30 x 30 foot
area. If you need to adjust the angle and are not sure when viewing a
cash register or looking down aisles, we recommend a vari-focal lens
which you can adjust manually based on the angle and distance of the
camera to the subject. For example, with a cash register we recommend a
4-8mm vari-focal lens so you can manually adjust and capture the money,
hands, and register close up. When in doubt, go with a vari-focal
Lux and low lighting chart
Very Dark Day
During the day the amount of
illumination reaching a scene depends on the time of day
and atmospheric conditions. Direct sunlight
produces the highest-contrast scene, allowing maximum
identification of objects. On a cloudy or
overcast day, less light is received by the objects in
the scene, resulting in less contrast. To
produce an optimum camera picture under the wide
variation in light level (such as occurs when the sun is
obscured by clouds), an automatic-iris camera system is
required. Typically, scene illumination
measured in foot-candles (ftcd) can vary over a
range of 10,000 to 1 (or more), which exceeds the
operating range of most cameras for producing good
quality video images. The chart above
summarizes the light levels occurring under daylight and
these low light level conditions. The
equivalent metric measure of light level (lux)
compared with the English (ftcd) is given.