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What is an analog video security system?
Cameras on a modern analog CCTV system send their video in the traditional baseband format over coax or UTP cabling back to a digital video recorder (DVR). Here, a video is digitized and stored on hard drives. Most modern DVRs are a network device, and as such can be accessed remotely from the LAN, or with the proper configuration, from across a WAN or the internet. There are no tapes to change. The video is kept on hard drives, typically on a FIFO basis so there is always a rolling video archive of the past X days. So, despite the fact that video is being transmitted from the cameras in an analog format, live and recorded video is still available over the network.
Note: This is technically a hybrid system since the video is recorded and retrieved digitally. But, in the industry, the term hybrid system typically refers to a system that has some IP cameras and some analog cameras. So, we refer to a system that uses all analog cameras as an analog system.
What is an IP video security system?
IP video cameras broadcast their video as a digital stream over an IP network. Like an analog system, a video is recorded on hard drives, but since the video is an IP stream straight from the camera, there is more flexibility as to how and where that video is recorded. The DVR is replaced with an NVR (network video recorder), which in some cases is just software since it doesn’t need to convert analog to digital. Video footage can then be stored on new or existing network RAID drives as directed by the NVR software.
What is a Hybrid video security system?
Hybrid CCTV systems combine IP and analog video and can be a great way to transition an analog system to IP without needing to replace all of the existing cameras. Many NVR boxes on the market today are actually Hybrids in that they accept analog cameras, and IP cameras and combine them into a single platform for the user.
Why Choose an Analog System?
Cost. IP video security systems are generally more expensive, and sometimes a LOT more expensive. But, because the systems are designed differently from the ground up, there are situations where the cost difference between analog and IP is minimal, and even scenarios where IP video is cheaper. More detail on the cost differences later.
Why Choose an IP System?
Resolution. One of the biggest factors driving interest in IP video systems is the high resolution that they can offer. Analog cameras max out on a resolution at about 580 TVL which equates to roughly 0.4 megapixels. High-end IP cameras, on the other hand, are currently available at resolutions above 5 megapixels. This high resolution, in turn, gives users the ability to zoom in on video after the fact, and still have usable video.
Another benefit to IP video is that it is much more compatible with wireless. Wireless analog systems are available, but they either have to convert to IP anyway and broadcast over the 802.11 IP network (which adds cost for encoders), or they get crammed onto the over-saturated regulated frequencies and often encounter interference.
For any further assistance, please feel free to call or drop me an email. Look forward to hear from you soon.
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Email: info@nobleinfotech.ae
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