| The Glossary An all inclusive glossary of security lingo is provided for your convenience. This list will undoubtedly be helpful when delving in to the realm of security. |
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| I: IDE - Interface device electronics. Software and hardware communication standard for interconnecting peripheral devices to a computer. I/O - Input/Output. I/P - Input. A signal applied to a piece of electric apparatus or the terminals on the apparatus to which a signal or power is applied. I2R - Formula for power in watts (W), where I is current in amperes (A), R is resistance in ohms (W). IEC - International Electro technical Commission (also CEI). Imaging device - A vacuum tube or solid state-device in which the vacuum tube light-sensitive face plate or solid-state light-sensitive array provides an electronic signal from which an image can be created. Impedance - A property of all metallic and electrical conductors that describes the total opposition to current flow in an electrical circuit. Resistance, inductance, capacitance and conductance have various influences on the impedance, depending on frequency, dielectric material around conductors, physical relationship between conductors and external factors. Impedance is often referred to with the letter Z. It is measured in ohms, whose symbol is the Greek letter omega - W. Input - Same as I/P. Inserter (also alphanumeric video generator) - A device for providing additional information, normally superimposed on the picture being displayed; this can range from one or two characters to full-screen alphanumeric text. Usually, such generators use the incoming video signal sync pulses as a reference point for the text insertion position, which means if the video signal is of poor quality, the text stability will also be of poor quality. Interference - Disturbances of an electrical or electromagnetic nature that introduce undesirable responses in other electronic equipment. Interlaced scanning - A technique of combining two television fields in order to produce a full frame. The two fields are composed of only odd and only even lines, which are displayed one after the other but with the physical position of all the lines interleaving each other, hence interlace. This type of television picture creation was proposed in the early days of television to have a minimum amount of information yet achieve flickerless motion. Interline transfer - This refers to one of the three principles of charge transferring in CCD chips. The other two are frame transfer and frame-interline transfer. IP - Index of protection. A numbering system that describes the quality of protection of an enclosure from outside influences, such as moisture, dust and impact. IRE - Institute of Radio Engineers. Units of measurement dividing the area from the bottom of sync to peak white level into 140 equal units. 140 IRE equals 1Vpp. The range of active video is 100 IRE. IR light - Infrared light, invisible to the human eye. It usually refers to wavelengths longer than 700 nm. Monochrome (B/W) cameras have extremely high sensitivity in the infrared region of the light spectrum. Iris - A means of controlling the size of a lens aperture and therefore the amount of light passing through the lens. ISDN - Integrated Services Digital Network. The newer generation telephone network, which uses 64 kb/s speed of transmission (being a digital network, the signal bandwidth is not expressed in kHz, but rather with a transmission speed). This is much faster than a normal PSTN telephone line. To use the ISDN network you have to talk to your communications provider, but in general a special set of interface units (like modems) are required. ISO - International Standardization Organization. ITU - International Telecommunications Union (also UIT). |
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