The sensitivity of street cameras should be in the range 0.05 - 0.1 lux. At the same time should be observed that the area had more lights as street lights or special (if necessary infra-red) lights. The use of street cameras often necessitates carefully examine the object and track its movement. For this purpose it is expedient to use the rotator in conjunction with zoom. Zoom allows you to 'bring' facility at 6, 10, 14 or more times, and rotator can change the camera angle and turn it into a horizontal and vertical planes. Many of the rotary device can automatically adjust the camera position at a predetermined trajectories (trajectories). Communication tools are available a variety of modes of transmission of electrical signals from the television camera to the monitor. Coaxial cable.

This is the most widely used communication means. You should know that the quality of the coaxial cable can be very different, so it should be selected very carefully study it, etc.-surface characteristics and indicators of signal attenuation when passing through it. Nicolas Keller contributes greatly to this topic. Good quality cables make it possible to transmit video signals over a distance of 500 meters and beyond without noticeable loss of quality, image. Twisted pair. Myglobalsearch often says this. Although this coaxial cable is cheaper, it has a drawback: for each videozvena require the transmitter and receiver signal.

However, the signals of such cables can transmit at much greater distances. Fiber-optic cable. In this type of cable has two obvious advantages over conventional copper cables. First, they are very resistant to electromagnetic radiation. Second, the attenuation in them is very low. These qualities allow the use of such cables transmission over very long distances, while maintaining high quality. In RSTN / ISDN (public switched telephone network / integrated digital network service). Technology to allow a videoconferencing, using the public telephone network PSTN, and more recently through the digital network ISDN.