Availability

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Definitions

European Definitions

ENTSO-E
Availability is a measure of time during which a generating unit, transmission line, ancillary service or another facility is capable of providing service, whether or not it actually is in service. [1]


EU JRC
For HVDC schemes, the term availability represents “energy availability”. Energy availability is the ability of a HVDC scheme to transmit, at any time, power up to the rated power. [2]

Hence, a converter scheme which can transmit 1.0 pu power for 100% of the time would have an energy availability of 100%. Any outage of the HVDC scheme or, for example, the outage of one pole in a bipole, will impact the energy availability, reducing the figure to less than 100%.


International Definitions

IAEA

Availability is the property of being accessible and usable upon demand by an authorized entity. [3]



ITU-T

The property of being accessible and useable upon demand by an authorized entity. [4]


Disponibilité: Propriété d'être accessible et utilisable sur demande par une entité autorisée. [5]


Disponibilidad: Propiedad de ser accesible y utilizable a petición por una entidad autorizada. [6]


可用性: 能够根据授权实体的要求进行访问和使用的特性. [7]


National Definitions

Argentina

Disponibilidad: se garantiza que los usuarios autorizados tengan acceso a la información y a los recursos relacionados con la misma, toda vez que lo requieran. [8]



Brazil

Disponibilidade: propriedade de que a informação esteja acessível e utilizável sob demanda por uma pessoa física ou determinado sistema, órgão ou entidade. [9]
Availability is the property that the information is accessible and usable upon demand by an individual or certain system, agency or entity.



Cameroon (Cameroun)

Disponibilité: critère de sécurité permettant que les ressources des réseaux de communications électroniques, des systèmes d’information ou des équipements terminaux soient accessibles et utilisables selon les besoins (le facteur temps). [10]



Canada

The state of being accessible and usable in a timely and reliable manner.

Condition d’être accessible et utilisable de manière fiable et en temps opportun. [11]



Colombia

Disponibilidad: Propiedad de que la información y sus recursos relacionados deben estar disponibles y utilizables cuando se los requiera. [12]



Czech Republic

Vlastnost přístupnosti a použitelnosti na žádost autorizované entity). [13]

Property of availability and usability at the request of an authorized entity.[14]



Germany

Verfügbarkeit ist die Fähigkeit einer Einheit, eine angeforderte Funktion zu jedem beliebigen Zeitpunkt innerhalb eines vorgegebenen Zeitintervalls erfolgreich durchzuführen, unter der Voraussetzung, dass externe Ressourcen, soweit gefordert, vorhanden sind (ITU-T E.800). [15]


Die Verfügbarkeit A(t), engl. availability, einer Betrachtungseinheit ist die Wahrscheinlichkeit, dass die Betrachtungseinheit alle zugesicherten Eigenschaften bei den beschriebenen Umgebungsbedingungen zum beliebigen Zeitpunkt t einhält oder fehlerfrei funktioniert. [16]



Iceland

Tiltækileiki: Merkir að upplýsingar séu aðgengilegar og þjónusta tiltæk þegar á þarf að halda, eða eins og mögulegt er svo sem við rafmagnsleysi, náttúruhamfarir, slys eða netárásir. [17]



India

The extent to which information or processes are reasonably accessible and usable upon demand, by an authorised entity, allowing authorised access to resources and timely performance of time-critical operations. [18]



Islamic Republic of Afghanistan

See Accessibility. [19]



Japan

アベイラビリティ/可用性: ある認可されたシステム主体によって要求されたとき、システムについての性能仕様に従って、アクセス可能であり、かつ、利用可能であるというシステムもしくはシステム資源の属性.

(Cyber) The property of a system or a system resource being accessible and usable upon demand by an authorized system entity, according to performance specifications for the system. [20]



Morocco

Disponibilité: Objectif de sécurité qui consiste à assurer un accès permanent à l’information et aux services offerts par le système d’information. C’est une garantie de la continuité de service et de performances des applications, du matériel et de l’environnement organisationnel. [21]



Netherlands

[Dutch] Beschikbaarheid is de mate waarin informatie op de juiste momenten beschikbaar is voor gebruikers. [22]



Oman

Availability is the need to ensure that the business purpose of the system can be met and that it is accessible to those who need to use it. [23]



Philippines

Availability - The property of being accessible and useable upon demand by an authorized entity; ensuring timely and reliable access to and use of information. [24]



Portugal

[Definição] - Disponibilidade: Em tecnologias da informação e da comunicação, capacidade de uma unidade funcional permanecer em estado de realizar uma determinada função dentro de condições determinadas, num dado instante ou num dado intervalo de tempo, supondo que estão assegurados os necessários meios exteriores. [25]



United States

FISMA
Availability means ensuring timely and reliable access to and use of information. [26]


NIST
Ensuring timely and reliable access to and use of information. [27]


DHS
The property of being accessible and useable upon demand by an authorized entity. [27]


Uruguay

Disponibilidad: Propiedad de mantener la información accesible a quien la necesita en el momento que la necesita. [28]



Standard Definition

IETF

The property of a system or a system resource being accessible, or usable or operational upon demand, by an authorized system entity, according to performance specifications for the system. [29]


ISA

Availability is the probability that equipment will perform its task. [30]


ISO/IEC 27000:2014

Property of being accessible and usable upon demand by an authorized entity. [31]


See also

Notes

  1. ENTSO-E Glossary of Terms
  2. Definition of an assessment framework for projects of common interest in the field of smart grids, 2014
  3. IAEA - Nuclear Security Series Glossary Version 1.3 (November 2015)
  4. ITU Security in Telecommunications and Information Technology: An overview of issues and the deployment of existing ITU-T Recommendations for secure telecommunications, ITU-T, Geneva (2012) - ITU-T H.235.
  5. Sécurité dans les télécommunications et les technologies de l’information: Aperçu des problèmes et présentation des Recommandations UIT-T existantes sur la sécurité dans les télécommunications, ITU-T, Geneva (2012) - ITU-T X.800.
  6. Seguridad de las telecomunicaciones y las tecnologías de la información: Exposición general de asuntos relacionados con la seguridad de las telecomunicaciones y la aplicación de las Recomendaciones vigentes del UIT-T, ITU-T, Geneva (2012) - ITU-T X.800.
  7. 关于电信安全的若干议题综述 及相关ITU-T建议书应用简介, ITU-T, Geneva (2012) - ITU-T H.235.
  8. Oficina Nacional de Tecnologías de Información ADMINISTRACION PUBLICA NACIONAL Disposición 3/2013 - Apruébase la “Política de Seguridad de la Información Modelo” (2013)
  9. GUIA DE REFERÊNCIA PARA A SEGURANÇA DAS INFRAESTRUTURAS CRÍTICAS DA INFORMAÇÃO Versão 01 (Nov. 2010)/ Instrução Normativa Nº 1, de 13 de junho de 2008. Gabinete de Segurança Institucional da Presidência da República.
  10. LOI N°2010/012 DU 21 DECEMBRE 2010 RELATIVE A LA CYBERSECURITE ET LA CYBERCRIMINALITE AU CAMEROUN
  11. Vocabulaire de la gestion des urgencies/Emergency Management Emergency Management Vocabulary 281 (2012)
  12. Glosario MINTIC – ICT Ministry of Colombia
  13. Výkladový slovník kybernetické bezpečnosti (2013)
  14. Cyber Security Explanatory Glossary (2013)
  15. BSI Glossary
  16. BSI Glossary
  17. [1]
  18. India's DGQA Cyber Security Policy (2015)
  19. National Cyber Security Strategy of Afghanistan (2014)
  20. RFC2828 (Japanese translation)
  21. DIRECTIVE NATIONALE DE LA SECURITE DES SYSTEMES D'INFORMATION, Marocco 2013
  22. Zakboekje Preventie Cybercrime (2008
  23. Oman CERT Glossary
  24. DND GLOSSARY OF CYBER SECURITY TERMS (v.4)
  25. Glossário Centro National de Cibersegurança Portugal
  26. The Federal Information Security Modernization Act of 2014 (FISMA)44 U.S.C. § 3552(b)(2).
  27. 27.0 27.1 NISTIR 7298 rev 2: Glossary of Key Information Security Terms, May 2013 / 44 U.S.C., sec. 3542 Cite error: Invalid <ref> tag; name "NISTIR7298" defined multiple times with different content
  28. Glossary CERTuy
  29. IETF RFC449 Internet Security Glossary 2
  30. [ISA WG7]
  31. ISO/IEC 27000:2014, Information technology -- Security techniques -- Information security management systems -- Overview and vocabulary