About CCTV Cameras
Story by: admin
29 September 2021
CCTV camera casings are built to resist dust and water to a certain degree. An ‘IP rating’ describes the level of ‘Ingress Protection’ the casing has. Your cameras will be protected from most weather conditions and are dust tight.
The outside of the lenses will need to be cleaned at least once a year. Securico CCTV offers an annual service / maintenance visit which includes cleaning the camera lenses as well as a full diagnostic check-up (including recorder box). Contact us for more information.
Analogue and Digital Cameras
DVRs support analogue cameras, whereas NVRs support digital cameras.
The main differences between analogue and digital cameras are:
● How the video is transferred to the recorder box
● Digital cameras generally have higher resolutions
● Digital cameras tend to offer enhanced behaviour detection
All camera cables route back to the DVR / NVR from where the video is processed and stored, and then securely streamed on-demand via your wifi router to authorised devices or output to a monitor or TV directly connected to the recorder.
A sensor on the camera detects the light levels, and at the appropriate light level will turn on infrared switching over to night vision. Since each camera will be in different positions around a building, the light levels will differ somewhat and therefore the cameras will switch to night mode (and back) at slightly different times.
Power to analogue cameras is usually a separate power supply.
One of these power supplies can provide power for up to 4 cameras.
If you have an NVR you have digital cameras that use power over ethernet (PoE) meaning that the NVR provides the power over the same cable to each camera.