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Camera, DVR, and VIP products Glossary of CCTV Terms | en
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Bosch Security Systems Glossary of CCTV Terms AR18-08-B000 | | Version 1.0 | 2008.08
Hybrid Streaming The ability to simultaneously stream IP video across a local or wide area network, and CVBS
video via coaxial or fiber optic cabling.
I
ICMP Internet Control Message Protocol: One of the core protocols of the Internet protocol suite. It
is chiefly used by networked computers' operating systems to send error messages indicating,
for instance, that a requested service is not available or that a host or router could not be
reached.
ID Identification: A machine-readable character string.
IEEE Institute of Electrical and Electronics Engineers: The world's leading professional association
for the advancement of technology.
IEEE 802.1x The IEEE 802.1x standard provides a general method for authentication and authorization in
IEEE-802 networks. Authentication is carried out via the authenticator, which checks the
transmitted authentication information using an authentication server (
see
RADIUS server)
and approves or denies access to the offered services (LAN, VLAN, or WLAN) accordingly.
IGMP Internet Group Management Protocol: A communications protocol used to manage the
membership of Internet Protocol multicast groups.
Image Stabilization An algorithm that virtually eliminates camera shake in both the vertical and horizontal axes,
resulting in exceptional image clarity.
Infrared Illumination Electromagnetic radiation (light) with a longer wavelength than is visible to the human eye. IR
illumination is prominent at dusk and dawn and in incandescent lamps. IR illuminators come
in the form of lamps with the appropriate filters, LEDs, or lasers. CCD sensors are less
sensitive to IR than visible light, but IR can significantly increase the total illumination level,
leading to a much better image at low light levels.
Intermodal Dispersion
See
Modal Dispersion
IP Internet Protocol: The main protocol used on the Internet, normally in conjunction with TCP
(Transfer Control Protocol); (
see
TCP/IP).
IP 66 IP code (Ingress Protection) that indicates the degree of protection provided by enclosures
for electrical equipment. The first number indicates protection of internal equipment against
the ingress of solid foreign objects. The second number indicates protection of internal
equipment against harmful ingress of water. Higher digits refer to higher levels of protection.
See also
NEMA Rating.
IP Address The address of a device attached to an IP network. Each device on an IP network must use a
unique address. Every IP data packet contains a source address (sender) and a destination
address (recipient). Each IP address consists of 32-bits that are arranged into four 8-bit octets
(x.x.x.x). IP addresses range from 0.0.0.0 to 255.255.255.255.
IPS Images per Second: a measurement of the rate that pictures are displayed to create a video
stream. A rate of 25 IPS (PAL) or 30 IPS (NTSC) is generally considered to be full motion
video.
IRE Institute of Radio Engineers: A measurement of video amplitude that divides the area from the
bottom of sync to peak white level into 140 equal units - 140 IRE equals 1V peak-to-peak. The
range of active video is 100 IRE. The institute itself was founded 1912 in New York City,
merged to form IEEE in 1957.