Network Video Recorders
A Network Video Recorder or NVR is an internet protocol based device that sits on a network. Because they are IP based,
Network Video Recorders can be managed remotely via a LAN or over the Internet giving greater flexibility. The basic function
of an NVR is the simultaneous recording and remote access of live video streams from an IP Camera.
Access Control
An access control point, which can be a door, turnstile, parking gate, elevator, or other physical barrier where granting
access can be electrically controlled. Typically the access point is a door. An electronic access control door can contain
several elements. At its most basic there is a stand-alone electronic lock. In larger applications involving more than one
door electric strikes or magnetic locks are used. The lock is unlocked by an operator with a switch or using an badge access
card.
IP Cameras
IP cameras are Closed-circuit television (CCTV) cameras that utilize Internet Protocol to transmit image data and control
signals over a Fast Ethernet link. As such, IP cameras are also commonly referred to as network cameras. IP cameras are
primarily used for surveillance in the same manner as analog closed-circuit television. A number of IP cameras are normally
deployed together with a digital video recorder (DVR) or a network video recorder (NVR) to form a video surveillance system.