POE stands for Power over Ethernet, it's a technology that transmits both data and power supply simultaneously to network devices (the security camera's) without changing existing Cat.5 cable network structure. POE allows you to supply power to a networking device using the same cable that transmits the data, which in turn, greatly reduce the cost's of installation and maintenance.
A complete POE system includes Power Sourcing Equipment (PSE) and Powered Device (PD) two parts.
Power Sourcing Equipment (PSE): The equipment supports POE function such as POE switch.
Powered Device (PD): IP/network cameras in video surveillance system.
Full kit all plug and play.
Security cameras are an essential component to a home security system. Visible cameras deter burglars and recorded footage can help you recover items after a break-in and prosecute the perpetrators. Internet connected cameras let you see both the interior and exterior of your home from anywhere, helping you avert or mitigate disasters and keep an eye on inhabitants, as well as prevent theft.
There are many options when it comes to adding surveillance around your home that can be remotely accessed and controlled from your smartphone or tablet, to covert cameras that capture video and images from a hidden location, to complete DVR kits that can handle and record video from several camera locations.
* Wireless -- This is the closest thing to a traditional surveillance system, but because it is wireless you can install it yourself. With a minimum of four bullet style cameras hooked up to a digital video recorder, you can have professional quality interior or exterior monitoring for a fraction of the professional price.
NVR or DVR? Which is better, or more importantly, which system is better suited for your needs? Both types of systems pretty much provide the same thing a video recording of an observed area but each system goes about it in a different way.
The Difference Between NVR and DVR Security Systems
The two main differences between NVR and DVR surveillance systems are the type of cameras used and the way the camera and recorder communicate with each other.
A network video recorder (NVR) works with either wired or wireless IP cameras that connect to a router. It's through the router that IP cameras communicate with the NVR. IP cameras also process video from analog to digital in the camera, which is less work for the NVR to do, making the system more efficient. NVR systems also connect to a computer or storage device via the Internet or a local area network (LAN). This reduces the cost of running wires and provides more options of where to place cameras in areas you want to monitor. But even though NVR surveillance systems are popular due to their wireless features, there are some disadvantages. If the local network or Internet fails, you could lose valuable camera footage, compromising your security. Plus, other devices such as phones or physical walls can cause interference, resulting in poor video quality or loss of signal.
A digital video recorder (DVR) works with wired, analog or digital cameras that connect directly to the DVR. They also don't need an Internet connection to work. The DVR basically converts the video feed from the camera into a digital, compressed format, which can be stored on a memory card, hard drive, or computer. Since DVRs are made to work with analog cameras that are connected through coaxial cable, upgrading an existing CCTV system can be easy because the coaxial wiring is already in place. There are also some hybrid DVR systems that are compatible with newer IP cameras that are connected by RJ45 network cables, which means you can create or upgrade a security system using both types of cameras.
Here's a list of some Pros and Cons to keep in mind for both systems.
- Installation can be easy with minimal wiring required.
Works with wireless IP cameras, allowing more freedom of camera placement.
- Can work with cameras that produce greater resolutions and other features such as motion detection.
- Processing video from analog to digital occurs in the camera, which allows the system to be more efficient.
- Can connect to the Internet to allow remote viewing capabilities and the ability to store data in multiple locations.
The data of an NVR system can be encrypted for better protection.
- Is dependent on network stability. If the network goes down or is affected by other devices, physical obstructions, or weather, it can experience interference or fail to record.
- Is susceptible to attacks by hackers over the Internet or LAN.
- Network costs and data usage can be affected due to the large amount of data used.
- Typically more expensive than DVR systems.
- DVR systems can be used to upgrade existing CCTV systems to digital using pre-existing wiring.
- Since DVR systems are hard-wired, they are not network dependent, therefore they won't fail due to network outages.
- If not connected to the Internet, DVR systems are safe from viruses, malware, and being hacked online.
- DVR systems are typically less expensive than NVR systems.
- If the DVR fails or malfunctions, the system goes down.
- Not all DVR systems can connect online, limiting the ability for remote viewing and monitoring.
- Installation can be more work and costly since each camera requires a wire to connect to the DVR.
- If analog cameras are used, they will most likely provide lower resolutions with little or no advanced features.
- DVR systems can be compromised if the wires are damaged, cut, or physically accessed for viewing.