Basically, both NVR and DVR systems are responsible for video recording. However, they differ in how they record the footage. The DVR system processes data at the recorder, while the NVR system encrypts and processes data at the camera before sending it to the recorder for storage and remote viewing.

If your NVR is connected to a monitor and to power, it doesn't need to be connected to the Internet in order to access the recorder's camera feeds. In fact, the recorder doesn't even need to be connected to a LAN outside of itself.

With these systems, both the NVR and IP cameras have WiFi access points built into them. For long range wireless video transmission, you will need to use stronger wireless radios that are added on to the NVR and IP cameras separately.

A network video recorder popularly called NVR is a software program that enables recording surveillance video in a digital format to a disk drive, USB flash drive, memory card or other similar mass storage device.

ICR ( Infrared Cut Filter ) is used with color CCD or CMOS image sensors to produce accurate color images. During the day, the camera uses an ICR to reflect or block mid-infrared wavelengths while passing visible lights.

Mechanical keys are the simplest form of physical access control and the method many smaller organisations use. Even for a small company, however, using mechanical keys has several flaws and limitations – especially as an organisation gets bigger. Below are just some of the problems presented by using keys.

People lose keys

If someone loses a key, you need to replace the lock to make sure the lost key can’t be misused. You then need to distribute new keys to everyone who needs access to that door.

Keys don’t leave an audit trail

You can’t see if and when someone’s used a key, so you don’t know who’s entered or at what time.

Keys are difficult to manage

If someone needs to enter many different buildings and rooms, they’ll need a large number of keys, which are inconvenient to carry and use. It can be difficult to remember which key is for which door, but it’s too much of a security risk to label them.

When we talk about a physical access control system, we’re usually referring to an electronic security system. They typically use an identifier such as an access card to authorise people to enter certain areas. And, as they’re capable of logging who accessed where and when, they can provide valuable data to help you track how your buildings and sites are being used.

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