Wall Mount Power Supply : This is the name given to the external cubed shaped power supplies that plug into wall outlets and over populate power strips.
WAN : Acronym for Wide Area Network. A WAN is typically a number of individual LANs connected together through telecommunication links (ISDN, T1, DSL, etc.) either directly, or, through the Internet.
Watchdog : This is the name given to a diagnostic/recovery tool that is incorporated into many DVRs. Several “heart beat” signals are constantly monitored during normal operation of the unit. If a signal is no longer present the unit will automatically reboot in an attempt to restore normal operation.
WDR : Acronym for Wide Dynamic Range. This refers to cameras. This is a high end feature. A camera viewing an image with very bright and very dark sections will probably not show any detail in the dark areas as the camera is adjusted to tone down the bright areas. With WDR the camera view will be much improved showing detail in both light and dark areas. This feature also provides better image detail in low light conditions.
Website : It’s hard to find a company without a website these days. It is even easy to generate your own website. With a company’s URL all you have to do is type it in the command line of your browser and you can see all they have to offer.
White level : The brightest part of a video signal corresponding to approximately 1.0 Volt.
WINS : (Windows Internet Name Service): Matches Microsoft network computer names to IP numbers.
Wired Alarms : Alarms generated by physical devices connected to the alarm inputs of video devices. Typical devices provide a simple contact closure (connect the input to ground) to initiate the alarm action.
Wireless : This refers to any device that can operate without the need for installing wires. High priced wireless systems have become very reliable. The low priced variety (the ones that would sell in typical low end CCTV applications,) need improvement in the reliability area.