Technical Dictionary

10/100 Base-T Standard – one of the Ethernet network standards (local area network (LAN) standard).

2D-DNR noise reduction is based on the analysis of individual video frames. 3D-DNR also analyses the differences between subsequent video frames to adapt the pixels and improve image fidelity. 3D-DNR technology provides better noise reduction, however it tends to blur the moving objects.

4K UHD – is a resolution standard developed by DCI (Digital Cinema Initiatives), with an image size of 3840 x 2160 pixels at 16:9 aspect ratio. The resolution is four times higher than the commonly used Full HD (1920x1080) resolution.

802.11ac wireless network standard operates at 5 GHz band and uses Multi-User MIMO (MU-MIMO) and beamforming technology. Along with a wider spectrum it offers speeds up to 1.3 Gbps (using three antennas).

IEEE 802.11b – is a wireless network standard providing bit rates of up to 11 MPs and a maximum distance up to approx. 50 m indoors and up to 100 m outdoors. The maximum distance can be increased with directional antennas. In Poland, the band available for this network is 2.4 GHz...2.4835 GHz corresponding to 13 channels.

IEEE 802.11g – a wireless network standard designed to extend the capabilities of 802.11b. The standard increases bandwidth to 54 Mbit/s using the same 2.4 GHz band as 802.11b. However, at high user densities there might be some issues with interferences and bandwidth, and the standards is replaced by IEEE 802.11n.

IEEE 802.11n – a wireless network standard using multiple antenna for increased data transfer rates operating at two frequency bands: 2.4 GHz and 5 GHz with a theoretical data transfer rates up to 600 Mb/s. In practice, the throughput of approx. 440 Mb/s can be achieved.

PoE IEEE 802.3af – a data and power transmission standard over a single twisted pair cable. The required power must not exceed 12.95 W. Guaranteed minimum distance is 100 m.

PoE IEEE 802.3af – a data and power transmission standard over a single twisted pair cable for devices with power input up to 25,5 W with a guaranteed minimum distance of 100 m.

AHD (Analog High Definition) - an HD (1280x720) and Full HD (1920x1080) signal transmission standard via a 75 Ω coaxial cable or twisted pair with video baluns.

The technology developed by Western Digital and implemented in Purple series CCTV optimized HDDs for 24/7 HD video streams.

AC (Alternating Current) – an electric current which periodically reverses direction at a specific frequency. The usual waveform of alternating current is a sine wave.

AWG (American Wire Gauge) – is an American standardized system for determining diameters or cross-sectional areas of wires.

A parameter defining the ability of the battery to power an electric circuit with a specific current for a specific time. The battery capacity is rated in ampere-hours (Ah).

A bit rate refers to a number of bits transmitted via a transmission channel or stored in the memory per second, usually measured in b/s (bits per second) or its multiple (kb/s, Mb/s, Gb/s etc.).

BLC (Backlight Compensation) is a mechanism by which a CCTV camera can compensate for backlight by enhancing automatic exposure control in intense lighting conditions.

BNC (Bayonet Neill-Concelman) – a connector used as a terminal of a coaxial cable in digital television, analogue television, CCTV cameras, measuring instruments and computer networks.

Attenuation loss, expressed in decibels per 100 m [dB/100m], determines the ratio of signal power at the beginning of the transmission route (cable) to signal power at a specific distance from the beginning of the transmission route (e.g. at 100 m).

CINCH (RCA) – quite popular and commonly used in a wide range of A/V equipment usually for audio signals.

Development of the operation analysis of the SonneTech illuminator and four other models commercially available in a similar price range

A method to reduce the size of data representing an image based on the analysis of redundant and non-essential information.

Configuring the motion detection function in APTI cameras.

Configuring the operation modes of APTI cameras compatible with GEMINI TECHNOLOGY recorders.

CRI (Colour Rendering Index) – is an index indicating how accurate a light source is at rendering colour of an object illuminated by that light source. CRI is a scale from 0 to 100 and the higher the index the better the object colours are rendered in a specific light.

Composite video, also referred to as the CVBS (Composite Video Baseband Signal) is an analogue video transmission signal without audio which contains image data in standard resolution of 480 and 570 or (480 lines or 576 lines interlaced).

dBi - antenna gain (‘G’) expressed in dBi shows a value in decibels by which the antenna gain is higher than that of a hypothetical isotropic antenna assuming that both antennas are fed with the same power.

dBm – absolute level relative to 1 mW (milliwatt); according to the rules we should use dBmW, however, dBm unit was adopted.

dBµV – absolute level unit relative to 1 µV (microvolt). The unit is commonly used in the radio, DVB-T and satellite technology.

Decibel – a ratio of one value to another on a logarithmic scale.

Insulator – a gas, liquid or solid with a low number of free electric charge carriers that does not conduct electricity.

DC (Direct Current) – a direct current whose value does not vary in time. Unlike alternating current (AC), in direct current (DC), the electric charge only flows in one direction, and the current is constant and unidirectional.

E.I.R.P. (Effective Isotropic Radiated Power) - is an equivalent effective isotropic radiated power defined as a power that would have to be radiated by a hypothetical isotropic antenna to achieve identical signal level in the direction of maximum radiation of a specific antenna.”

It is a ratio of the DC output power (generated by the power supply) to AC input power (received from the mains) expressed as percentages.

Data and power transmission at the distance of up to 800 m; introduced by Dahua.

It is an angle of view of the camera expressed in degrees, depending on the lens and camera type and the focal length of the lens. For lenses used in CCTV cameras, the field of view is horizontal.

Focal length is a distance between an optical focus of an optical system and a cardinal point of the optical system in millimeters and is defined as the lens system ability to focus light. The smaller the focal length, the more the light beams are focused by the optical system.

A frequency with which the device displays individual images (frames) that provide smooth playback of the video.