Cascadia Digital video recorder Manuel d'utilisateur télécharger pdf (Page 19)

CCTV Glossary

Cascadia Video Products LLC

19 / 43

IR light - Infrared light, invisible to the human eye. It usually refers to wavelengths longer than

700 nm. Monochrome (B/W) cameras have extremely high sensitivity in the infrared region of the

light spectrum.

Iris - A means of controlling the size of a lens aperture and therefore the amount of light passing

through the lens.

ISDN - Integrated Services Digital Network. The newer generation telephone network, which

uses 64 kb/s speed of transmission (being a digital network, the signal bandwidth is not expressed

in kHz, but rather with a transmission speed). This is much faster than a normal PSTN telephone

line. To use the ISDN network you have to talk to your communications provider, but in general a

special set of interface units (like modems) are required.

ISO - International Standardization Organization.

ITU - International Telecommunications Union (also UIT).

1 2 ... 14 15 16 17 18 19 20 21 22 23 24 ... 42 43

Pas de commentaire

Cascadia Digital video recorder Manuel d'utilisateur Page 19