Home' RTCA Documents for Review : DO-230H FRAC Contents 179
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An open specification, or standard, is a public document that is maintained by an open public consensus
process to accommodate new technology over time. Examples are interfaces defined by standards bodies
such as the International Organization for Standardization (ISO), the American National Standards Institute
(ANSI), and the Institute of Electrical and Electronics Engineers (IEEE).
Integrated airport security system designs based on open standards are preferred over designs based on
systems which are proprietary to one or a small number of vendors.
The term “open standards,” however, is open to interpretation, and validating what it actually means in a
particular situation is often a difficult process.
For an airport, a major issue is often the ability to upgrade or replace an item of hardware or software
independently of a manufacturer’s proprietary design data and protocols. Calling for open standards is
intended to prevent this from happening for new systems, and to mitigate the consequences when legacy
systems are upgraded.
Airport design and procurement packages should:
Cite open standards and specifications whenever possible.
Require that any exceptions to these standards and specifications be identified and be individually
justified in system proposals.
Require the demonstration of hardware and software compatibility and multi-vendor
interoperability during proposal evaluations, preferably by setting up a laboratory environment of
airport systems and equipment where such testing can be conducted.
The standards groups which relate to video surveillance systems include the IEEE (Institute of Electrical
and Electronic Engineers), ANSI (American National Standards Organization), the TIA (Electronic
Industries Alliance/Telecommunications Industry Association), the IETF (Internet Engineering Task
Force), the ISO (International Standards Organization), the ITU (International Telecommunications
Union), and UL (Underwriters Laboratories in the U.S. and its equivalent in other countries).
The IEEE publishes a number or standards including standards for control signaling communication, wired
and wireless local area networks (LANs), electrical safety, and other subjects. The TIA publishes standards
for LAN structured cabling and commercial cabling. Most video compression standards are published by
the ITU. These and other applicable standards should be listed in design specifications.
The standards for digital video encoders are narrowly focused with regard to compatibility and integration
with cameras and VMS software. For encoding and compressing video streams for network transmission
and storage, the currently available industry standards include H.264, MJPEG-4, and MJPEG.
U.S. and International Video Standards
Digital television standards are defined by the codec being used. The formats in use include:
CCIR 601, now reissued as an ITU-T standard, for commercial broadcast transmissions
H.264/MPEG-4 AVC (ITU-T + ISO), currently the de-facto standard for security video streams.
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