Availability

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Availability | disponibilité | اتاحية | Verfügbarkeit | disponibilidad | toimintakelpoisuustila | disponibilità | 可用性 | beschikbaarheid | dyspozycyjność | disponibilidade | razpoložljivost | расположивост , ж јд | tillgänglighet

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%.


ECA
Availability: Ensuring timely and reliable access to and use of information. [3]

[BG] Достъпност: Осигуряване на навременен и надежден достъп до информация и нейното използване.

[CS] Dostupnost: Zajištění včasného a spolehlivého přístupu k informacím a jejich využívání.

[DE] Verfügbarkeit: Gewährleistung, dass der Zugriff auf und die Nutzung von Informationen zeitnah und zuverlässig möglich ist.

[DK] Tilgængelighed: Rettidig og pålidelig adgang til og anvendelse af oplysninger.

[ES] Disponibilidad: Garantizar el acceso oportuno y fiable a la información, así como su utilización.

[NE] Beschikbaarheid: Het waarborgen van tijdige en betrouwbare toegang tot en gebruik van informatie.


International Definitions

IAEA

Availability is the property of being accessible and usable upon demand by an authorized entity. [4]



ITU-T

The property of being accessible and useable upon demand by an authorized entity. [5]


Disponibilité: Propriété d'être accessible et utilisable sur demande par une entité autorisée. [6]


Disponibilidad: Propiedad de ser accesible y utilizable a petición por una entidad autorizada. [7]


可用性: 能够根据授权实体的要求进行访问和使用的特性. [8]


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. [9]



Australia

Availability: The desired state that allows authorised users to access defined information for authorised purposes at the time they need to do so. [10]



Bolivia

Disponibilidad: Característica que permite a la información ser accesible cuando sea requerida por una entidad, persona o proceso autorizado. [11]



Brazil

Disponibilidade: propriedade de que a informação esteja acessível e utilizável sob demanda por uma pessoa física ou determinado sistema, órgão ou entidade. [12]
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). [13]



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. [14]



Colombia

Disponibilidad: Propiedad de que la información y sus recursos relacionados deben estar disponibles y utilizables cuando se los requiera. [15]



Czech Republic

Dostupnost: Vlastnost přístupnosti a použitelnosti na žádost autorizované entity). [16]

Availability: Property of availability and usability at the request of an authorized entity.[17]



Ecuador

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. [18]



Egypt

Availability: The degree to which a system, subsystem, or equipment is operable and in a committable state at the start of a mission, when the mission is called for at an unknown, i.e., a random, time. [19]

Note 1: The conditions determining operability and committability must be specified. Note 2: Expressed mathematically, availability is 1 minus the unavailability.

Availability: The ratio of (a) the total time a functional unit is capable of being used during a given interval to (b) the length of the interval. [19]

Note 1: An example of availability is 100/168 if the unit is capable of being used for 100 hours in a week. Note 2: Typical availability objectives are specified in decimal fractions, such as 0.9998.

France

Disponibilité: Propriété permettant de rendre le service attendu en temps voulu et dans les conditions d’usage prévues. [20]

Availability: Property allowing the expected service to be performed in the desired time and in conformity with the expected conditions of use. [21]



Gambia

Availability: The property of being accessible and usable upon demand by an authorized entity. [22]



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). [23]


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. [24]



Guatemala

Disponibilidad: Propiedad de ser accesible y utilizable a pedido de una entidad autorizada. Fuente: ISO/IEC 27000:20016 [25]



Hong Kong

可用性 : 獲授權一方可合理地接達及使用資訊或程序的狀態,包括及時 和重要的運作。

Availability: A condition in which information or processes are reasonably accessible and used by an authorised party including timely and critical operations. [26]



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. [27]



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. [28]



Islamic Republic of Afghanistan

See Accessibility. [29]



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. [30]



Kingdom of Saudi Arabia

Availability: ensuring timely and reliable access to and use of information. (NISTIR 7298r2 Glossary of Key Information Security Terms) [31]


Availability: Ensuring timely and reliable access to and use of information. [32]

from: (NISTIR 7298r2 Glossary of Key Information Security Terms)



Kuwait

Availability: is the assurance that an infrastructure has suitable recoverability and protection from system failures, natural disasters or malicious. [33]



Luxembourg

Disponibilité: Propriété d’être accessible et utilisable à la demande par une entité autorisée. [34]



Mexico

Disponibilidad: Las dependencias y entidades serán responsables de que la información o datos contenidos en sus sistemas o aplicaciones para la prestación de servicios digitales cuenten y cumplan con un nivel de servicio comprometido entre ellas y, en su caso, con los usuarios. [35]



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. [36]



Mozambique

Disponibilidade: garantir que a informação esteja sempre disponível para o uso legítimo, ou seja, por aqueles usuários autorizados pelo proprietário da informação. [37]



Netherlands

[Dutch] Beschikbaarheid betreft het waarborgen dat vanuit hun functie geautoriseerde gebruikers op de juiste momenten tijdig toegang hebben tot informatie en aanverwante bedrijfsmiddelen (informatiesystemen). [38] [39]


[Dutch] Beschikbaarheid is de mate waarin informatie op de juiste momenten beschikbaar is voor gebruikers. [40]


Beschikbaarheid: Een kwaliteitskenmerk voor een object of dienst voor (informatie)beveiliging. Geeft aan in hoeverre een object, (ICT-)dienst, systeem of component zonder belemmering toegankelijk is voor geautoriseerde gebruikers. De beschikbaarheid wordt in de regel als een percentage gepresenteerd, waarbij een hogere waarde een positievere uitkomst is dan een lage waarde. [41]



Beschikbaarheid: De zekerheid dat gebruikers in een digitaal systeem of bij informatie kunnen of gebruik kunnen maken van digitale diensten of processen wanneer zij dat willen of zouden moeten kunnen. Gepland onderhoud telt niet mee. [42]


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. [43]



Peru

Disponibilidad: El sistema de control se considera disponible cuando toda la funcionalidad requerida está operando de acuerdo a cómo fue definida. [44]



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. [45]



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. [46]


Disponibilidade Propriedade de estar acessível e de poder ser utilizada a pedido de uma entidade autorizada. [47]



Serbia

расположивост је својство које значи да је податак доступан и употребљив на захтев овлашћених лица онда када им је потребан. [48]



Tanzania

Data availability - refers to how available data is when stored in some form, usually in reference to remote storage of data through a network or external storage media. [49]



United States

DHS
The property of being accessible and useable upon demand by an authorized entity. [50]


FISMA
Availability means ensuring timely and reliable access to and use of information. [51]


NIST
Availability: Ensuring timely and reliable access to and use of information. [50]


Availability: a requirement intended to assure that systems work promptly and service is not denied to authorized users. (from: NIST SP 800-12) [52]


Availability: The security objective that generates the requirement for protection against intentional or accidental attempts to (1) perform unauthorized deletion of data or (2) otherwise cause a denial of service or data. (from: NIST SP 800-33) [52]


Financial Stability Board
Availability: Property of being accessible and usable on demand by an authorised entity. Source: ISO/IEC 27000:2018. [53]


Uruguay

Disponibilidad: Propiedad de mantener la información accesible a quien la necesita en el momento que la necesita. [54]



Standard Definition

ISO/IEC
Availability: Property of being accessible and usable on demand by an authorised entity. [55]


IEC

Availability is the probability that an item is in a state to perform a required function under given conditions at a given instant in time, assuming that the required external resources are provided. [56]


Availability is the state of an item of being able to perform its required function. [57]


Disponibilité est l'état d'un dispositif capable de remplir la fonction requise. [57]



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. [58]


ISA

Availability is the probability that equipment will perform its task. [59]


Availability is the property of ensuring timely and reliable access to and use of control system information and functionality. [60]



ISO/IEC 27000:2014

Availability: the property of being accessible and usable upon demand by an authorized entity. [61]


Dictionary

Beschikbaarheid: 1. De zekerheid dat gebruikers in een informatiesysteem of bij informatie kunnen wanneer zij dat willen.
2. Een percentage van de tijd dat gebruikers in een digitaal systeem konden.
Gepland systeemonderhoud telt niet mee. [62]



See also

Notes

References

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  30. RFC2828 (Japanese translation)
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  55. Source: ISO/IEC 27000:2018. -Financial Stability Board, Cyber Lexicon (Nov. 12, 2018)
  56. from IEV191-11-01
  57. 57.0 57.1 IEV 603-05-04
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  59. ISA WG7
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