wireless IP camera is equivalent to a set of CCTV system
|18.4.2017||Posted by electronics51 under E-shopy|
Rack-Mounted or Stand-Alone?
Video servers save space by fitting into existing server rooms, eliminating the need for dedicated Wireless Home Monitoring control rooms. If coax cabling has already been run to a central room, a video server rack can be used. Rack-mountable video servers come as “blades,” which are essentially video servers without their casings. This allows the video servers to be placed in server racks, which are common in IT environments. Placing blade video servers in racks allows them to be managed centrally with a common power supply. One standard 19- inch rack that is 3U high can fit up to 48 channels—meaning that up to 48 cameras can be digitized on a single rack.
The functionality of a blade server is exactly the same as a standalone video server. Blades are interchangeable and hot-swappable in the rack, and they provide network, serial communication and I/O connectors at the rear of each slot. In an analog camera system where coaxial cabling has not been run to a central location, it is best to use stand-alone video servers positioned close to each Home Security Cameras . This method reduces installation costs because it uses existing network cabling to transmit video, instead of running coaxial cabling to a central location. It also eliminates the loss in image quality that occurs over longer distances when video is transferred through coaxial cabling. A video server produces digital images, so there is no quality reduction due to distance.
Advantages of Going Digital
The Alaska Department of Transportation recognized the advantages of a network video system and recently incorporated video servers into nine of the largest ferry terminals in the Alaska Marine Highway System. The organization worked with integrator CamCentral to install the system, which uses video servers to digitize video from analog cameras installed throughout the ferry terminals, enabling staff, security services, and local law enforcement units to monitor the facilities, surrounding waters, and vehicle and passenger traffic via the Internet. When the terminals are closed, local law enforcement officials and other authorized users can access the system remotely and receive alerts if unusual motion is detected in the facilities. The Alaska DOT realized a number of advantages that video servers could bring to its analog surveillance systems.
Recording, management, and storage
Because video servers use standard PCs for video recording and management, they are easy to integrate with existing IT systems and can be managed as part of that infrastructure. Video servers allow video to be stored with standard storage solutions, including network attached storage (NAS). storage area networks (SAN) and Redun dant Arrays of Independent Disks (RAID). These storage systems are easily expand able, reliable, cost effective, and repair able or replaceable in case of failure. By contrast, DVR systems require proprietary hardware, which is more costly and diffi cult to replace or upgrade. CamCentral and the Alaska DOT also took advantage of the video servers’ ability to handle firewalls, passwords and other network security technology—something that can rarely be done with DVRs.
Both video servers and DVRs leverage existing investments in ana log cameras, but only video servers make total use of network infrastructure. This is particularly important when expanding the network video system. An Home Security Camera is expandable in one-camera increments. DVR systems, on the other hand, expand in larger increments. Once the capacity of a DVR is maximized, a new DVR box with 16 or more channels must be added to the system, even if only a handful of cameras need to be accommodated.
More information at http://www.jimilab.com/blog/ .