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Ups (uninterruptible power supply)
| CCTV glossary (глоссарий терминов по видеонаблюдению) |
A battery, attached to a piece of hardware, for example a server, that provides back up power for conducting an orderly shutdown if the server`s normal power supply fails.
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Conducting, английский
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Varifocal lens, английский
A camera lens with variable focal length in which the focus changes as focal length (and, therefore, the magnification) changes. this is different to a parfocal, or "true" zoom lens, which remains in focus as the lens zooms (focal length and magnification change). varifocal lenses offer greater flexibility over fixed lenses as they allow the lens aperture to be adjusted as needed. varifocal lenses come in a range of apertures, including 2.8-12 mm, 3.5-8 mm, and 6-60mm. the greater the aperture size, the more magnified the image will appear with greater detail being captured. a smaller aperture size will result in a wider view with less detail being captured.
Proximity card (prox card), английский
A access control credential that is encrypted with proximity technology and can be read by a proximity reader without having to physically insert the card into the reader, in order to grant a cardholder access to a location.
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