Top Technical Dictionary

Technical Dictionary


10/100 Base-T - Ethernet standard

Standard 10/100 Base-T – is one of Ethernet standards (standard of creating local (computer) area networks – LAN).

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802.11b - standard of wireless network

IEEE 802.11b standard - wireless network standard, which allows the flow rate up to 11 Mb/s and the maximum range, can be up to approx. 50 m indoors and approx. 100 m outdoors. The range can be increased by means of directional antennas. In Poland, the bandwidth available for this type of network is within the range of 2.4 GHz ...2.4835 GHz which corresponds to 13 channels.

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802.11g - standard of wireless network

IEEE 802.11g standard - standard of wireless network, which was designed as an extension to 802.11b. It increases data flow capacity to 54 Mbit/s using the same 2.4 GHz bandwidth, which is used in 802.11b. With a high density of users there are problems with interference and adequate data flow capacity of channels, so this standard is replaced, even by IEEE 802.11n.

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802.11n - wireless network standard

IEEE 802.11n standard - a standard for a wireless network using multiple antennas in order to increase data transmission rate. It can be used in two frequency bandwidths: 2.4 GHz and 5 GHz with a theoretical speed of up to 600 Mb/s. Currently, in practice it is reaching the speed of approx. 440 Mbit/s.

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802.3af - data transmission and power supply standard

PoE IEEE 802.3af standard - allows transferring data and power supply by means of a single twisted pair cable. The power of equipment may not exceed 12.95 W. Guaranteed minimum range is 100 m.

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802.3at - data transmission and power supply standard

PoE IEEE 802.3af standard - allows for data transmission and power supply via a single twisted pair cable for the devices of maximum 25.5 W power 25.5 W. Guaranteed minimum range is 100 m.

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AC adapter power

A parameter specifying the capability of AC adapter to supply required power to the device, expressed in watts (W) or volt-ampere (VA).

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Aerial types for data transmission at the waveband of 2.4 and 5 GHz.

A device must be equipped with an aerial to send and receive radio waves. Many contemporary devices have embedded aerials (e.g. mobile phones). There are many aerial types available on the market. There are also various aerial classifications.

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AHD - video signal transmission standard

AHD (Analog High Definition) - a standard that allows signal transmission in HD (1280x720), Full HD (1920x1080), 3 Mpx (2048x1536) and 4 Mpx (2560x1440) quality through 75 Ω coaxial cable or twisted-pair cable with video transformers.

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AllFrame Technology - reduction of video frame loss rate.

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

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Alternating current (AC)

AC (Alternating Current) - an alternating current, which is characterized by changes in the instantaneous values ​​in a particular frequency while maintaining repeatability. AC takes alternately positive and negative values ​​in sine curve characteristics.

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Battery capacity

The parameter specifying the battery's ability to energize an electric circuit of a given current intensity for a specified period of time. The battery capacity is expressed in ampere hours (Ah).

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Bit rate

Bit rate is the number of data transferred through the transmission channel or saved in memory within 1 s, measured usually in b/s (bits per second) and multiples (kb/s, Mb/s, Gb/s, etc.).

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BLC - configurable Back Light Compensation

BLC (Backlight Compensation) is the so-called backlight compensation; function of industrial camcorders, which automatically adjusts the level of image brightness in places of strong light source.

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BNC connector

BNC (Bayonet Neill-Concelman) - a connector used as the terminal of coaxial cable in the communication of digital and analog TV systems, CCTV cameras, measuring devices and computer networks.

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Camera viewing angle

This is the width of visual field expressed in degrees. This is dependant among others on the type of lens used in the camera, and the focal length of these lens. For lenses used in industrial cameras this is a horizontal angle.

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CCTV Support Software
The Delta Tools is a set of free tools (applications) necessary for designing, servicing or the supervisory work of the CCTV systems.
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CINCH (RCA) connector

CINCH (RCA) – quite popular and common connector used in a wide range of audio-visual devices, including but not limited to the connection of phonic signals.

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Colour of light

The colour of light belongs to the subjective sensations, similarly like sound, smell, taste and touch.

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Comparison of the SonneTech illuminator with other models available on the market

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

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Compression

A method of reducing data size representing an image based on the analysis of excessive and negligible information.

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Configuration of video camera operation modes, APTI series, with GEMINI TECHNOLOGY recorders

Description of the configuration of video camera operation modes, APTI series, compatible with GEMINI TECHNOLOGY recorders.

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CRI - Colour Rendering Index

CRI (Colour Rendering Index) – a given light source index which specifies the degree of colour rendering in objects lit with this light. This parameter falls within the range from 0 to 100 Ra; the higher the index, the better the colours of objects are rendered in a given light.

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CVBS - Composite Video Baseband Signal

Composite Video, also known as CVBS (Composite Video Baseband Signal) is an analogue video transmission signal (with no sound) which carries information in the standard resolution of 480 i or 576 i (480 lines or 576 lines with interlacing).

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dBi - power gain of isotropic antenna

dBi - power gain ("G"), expressed in dBi unit informs us by what value in decibels the antenna gain is larger in relation to hypothetical isotropic antenna, assuming that both antennas are supplier with identical power.

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dBm - a logarithm unit of power measure

dBm – a unit of absolute level of reference to the power of 1 mW (milliwatt); a dBmW expression ought to be used according to the rule but the expression of dBm is exceptionally used here.

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dBµV – logarithmic unit of voltage measure

dBµV – unit of an absolute level referred to the voltage of 1 µV (microvolt). This unit is commonly used in the radio technique, terrestrial television, satellite television, etc.

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Decibel (dB)

Decibel – a ratio of two values expressed by logarithms.

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Dielectric

Insulator – gas, liquid or solid – with negligible number of free carriers of electric charge. Owing to this property, it is not a conductor.

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Direct current (DC)

DC (Direct Current) - direct current, whose value does not change over time. Contrary to alternating current (AC), charges move always in one direction, by which it is characterized by a constant and changeless direction of their flow.

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E.I.R.P. (Effective Isotropic Radiated Power) - equivalent, replacement isotropic radiated power

E.I.R.P. (Effective Isotropic Radiated Power) - effective isotropic radiated power means by the definition of "power that would have to be radiated by a hypothetical isotropic antenna to obtain the same level of signal in direction of maximum radiation of given antenna".

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Efficiency (Efficiency)

This is the ratio of output power of constant current (given up by the power supply) to input power of alternating current (taken from the power grid), expressed as percentage.

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Focal length

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.

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H.264 - video coding standard

H.264 - a standard using hybrid coding, this uses a number of innovations and improvements that improves the compression of video sequences, while maintaining unchanged video quality.

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H.265 - video coding standard

H.265 - video compression standard, also called HEVC (High Efficiency Video Coding), the successor of H.264/AVC image coding standard.

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HD-CVI - video signal transmission standard

HD-CVI (High Definition Composite Video Interface) - a standard that allows signal transmission in HD (1280x720), Full HD (1920x1080) and 4 Mpx (2560x1440) quality through 75 Ω coaxial cable or twisted-pair cable with video transformers.

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HD-TVI - video signal transmission standard

HD-TVI (High Definition Transport Video Interface) - a standard that allows signal transmission in HD (1280x720), Full HD (1920x1080), 3 Mpx (2048x1536), 4 Mpx (2688x1520) and 5 Mpx (2560x1944) quality through 75 Ω coaxial cable or twisted-pair cable with video transformers.

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HDCP (High-bandwidth Digital Content Protection)

The system of the control and protection of images and sounds transmitted digitally by means of HDMI or DVI. It was developed by Intel.

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HDMI standard

Standard HDMI (High Definition Multimedia Interface) – an interface for transmitting data between devices. Since 2002, when this interface was introduced, there have been a few different standards.

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