Answers to the questions most frequently asked.Search our FAQ database to find andview listed articles relating to your questions.
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Surveillance cameras can be classified as indoor and outdoor models according to installation place. The main difference between two models is whether the camera is weather-proof or not. That is, outdoor camera does completely protect the inner material from weather like wind, rain, moisture, dust, snow, and humidity. Some outdoor cameras should have heater or blowers for temperature resistance. On the other hand, indoor cameras do not require weather-proof or temperature resistance except critical places which get high humidity or high/low temperature.
DOF (Depth of Field) refers to the range of distance that the subject appears acceptably sharp. DOF is determined by several factors such as aperture size, lens to subject distance, lens focal length, and image sensor size.
Generally, the following conditions result in a deep DOF.
- small or narrow aperature size (large f number)
- long distance between lens and subject
- short focal length
- small image sensor size (small image format)
ICR (Infrared Cut Filter) is used with color CCD or CMOS image sensors to produce accurate color images. During the day, the camera uses an ICR to reflect or block mid-infrared wavelengths while passing visible lights. However, as light diminishes below a certain level, some cameras can automatically turn off ICR functionality to deliver high-quality, black and white image using infrared light.
TDN (True Day/Night) technology supports night vision capability by implementing a physical ICR that is removed by a mechanical motor.
IRE stands for Insitute of Radio Engineers, and represents the composite video signal in percentage terms. That is, 100 IRE equals 100% full signal level which means 714mV amplitude active video signal.
Generally, 30 IRE is a minimum value for a detailed and acceptable image.
Can I use my existing switching hub to obtain DirectIP features?
Of course, you can use existing switching hub, But, most non-DirectIP switching hub can’t support the specific features like DirectIP hub.
DirectIP hub supports the following features.
- PoE functionality which is designed to be able to connect both IEEE 802.3af and IEEE 802.3at PD devices though all ports can’t connect IEEE 802.3at PD devices.
- Power on/off control for each camera
- Connection notification for each camera