When it comes to the actual signal capturing, IP and analog systems are very similar. They both operate via CMOS and CCD electronic chips. The main function of these chips is to convert the visible light into a readable signal. In an analog system, which is very similar to the way a video camera works, the signal is converted into a format readable by a TV screen. However, in the case of IP cameras, things don't flow quite the same. The signal, taken from the chip, must pass through an encoding device which is usually attached to a nearby web server. This automatically converts the camera into some sort of network device, thus, enabling users with the appropriate permissions to view it via an online network.
Analog cameras existed as vacuum tube based devices since the 70's. When these cameras first hit the market their resolution was not that great. As the years went by, significant enhancements were progressively made to the resolution as well as the addition of several key features took place. Amongst the top features was the introduction of backlight controls. This feature greatly reduces the flares resulting from bright streams of light entering from a small area. In order to address the various concerns over the misuse of CCTV cameras, Privacy masks have been developed and integrated into PTZ's. Last but, certainly, not least, Auto-iris lenses have made capturing images of florescent objects a lot sharper and clearer.
The ability to transmit the signal using a variety of methods is another trait of analog security cameras. Coax, Cat5, and wireless are some of the ways that analog cameras can transmit the signal coupled with the appropriate connecter. Having these different methods gives you the flexibility to use whichever is most convenient and affordable for your situation. As you might have guessed, having an assortment of cables may be cumbersome but very beneficial simultaneously. For instance, you might need a long run that is close to 2500 ft, for this you need professional grade baluns. On the other hand if you only need a short run less than 250 ft, then you should think about Cat5.
Moving on, web cameras were the birth mothers to IP cameras. The basic idea behind their revolution was to equip regular security web cameras with some abilities similar to those of the DVR system. Motion detection is amongst the prominent features of IP security cameras. A level of protective redundancy is created by enabling the cameras to record to SD cards that are already installed in the camera body frame. An analog output can also be added to the IP security cameras thus enabling analog to IP based system interaction
Either Cat5 or wireless transmissions can be used to link up IP cameras to an online network. Amongst the pros of the Cat5 system is its capability to be prolonged to an infinite length via the appropriate hubs, routers, and switches. Be prepared to install newly bought RJ-45 jacks, they are often required when using IP cameras. You can not depend on the preexisting jacks; their location often will not provide good security for the camera's connections. Luckily, a new type of hybrid cameras has recently entered the security market, these types of cameras are accommodated to accept analog as well as network connections.
Advantages of Analog Cameras:
1. You can easily meet your security needs by choosing a design that is most appropriate. Indoor domes, IR cameras, PTZ cameras and hidden small cameras are amongst the many different types that you can pick from.
2. Analog cameras are usually more “cost effective� than IP security cameras.
3. The signals produced by most analog security cameras are either PAL or NTSC. In the US NTSC are the most common, which enables you to utilize your existing camera.
Disadvantages of Analog Cameras:
1. It gets increasingly complicated to operate analog cameras over great distances.
2. The main problem with wireless analog cameras is wave interference, thus making it vulnerable to be viewed by any device which can pick up its signal.
3. A few important features such as digital zoom are not provided by Analog Cameras.
Advantages of IP Cameras:
1. It is rather simple to install more cameras at a remote location.
2. It is relatively easier to deal with wireless setup and interface due to the built in encryption.
3. Previous or already existing wirings can be used to connect new IP cameras
Disadvantages of Analog Cameras:
1. Plenty of security stores support many different brands of security cameras along with their own name brand. But some may only support and promote their brand, thus making it difficult for the consumer to find a good deal.
2. The high price associated with security camera's hardware make it significantly expensive when compared with analog cams.
3. Bandwidth of analog Cameras is usually high the normal range is about 500kbps to 1.5 Mbps
Before attempting to buy a security camera make sure that you research about analog and IP cameras. Knowing your current and future security needs will also help you to make the right choice when the times comes to make your purchase.
