Vonnic Standalone DVR Manuel d'utilisateur télécharger pdf (Page 9)

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Accessories

When installing any CCTV surveillance system, in addition to the cameras and DVR equipment,

there are many other accessories that may be required for completion. I have listed below

some of the more common accessories used by installers.

Cables

Video signals are transmitted from the camera to the DVR via coax or RG59 cable. Since

power has to be ran to the camera as well, most installers use Siamese cable which combines

the RG59 and power cable in one. Siamese cable comes in premade lengths and spools of 500

or 1000 feet. Premade cables are convenient as they

already have the BNC and Power connectors attached.

For longer runs, installers prefer to use the spooled ca-

ble to customize their lengths.

Connectors & Adapters

Any CCTV installation may require various connectors

and adapters. Connectors are components used to

conduct and transfer signals from one cable or device

to another. Adapters may be necessary to convert one

type or gender of a connector to another.

Video Baluns

Video baluns are impedance transformers that allow the transmittance of a

video signal (75 ohm) over cat 5 cable (100 ohm). They are used in pairs

to transform the impedance signal at one end and to transform it back at

the other end. Mismatching impedance signals will cause delays in the sig-

nal transmittance resulting in a ghosting effect on the picture. Installers

use baluns in areas where cat 5 is already ran making it more convenient

or for transmitting signals over distances exceeding 500ft.

Power Supplies

All cameras require some sort of power source. Power adapters or distribution boxes are used

in most installations. If installing 4 cameras or less, most installers will choose to use a power

adapter and splitter whereas installations involving more cameras, they will use a power dis-

tribution box. When choosing a power adapter, be sure to get one that supports the voltage

and amperage ratings for your cameras.

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Vonnic Standalone DVR Manuel d'utilisateur Page 9