one of three types of heuristic, according to which the probability of an event, or of an item having a property, is judged by the ease with which instances can be brought to mind their availability from memory See also representativeness, anchoring and adjustment
Assuring information and communications services will be ready for use when expected
The amount of time that the quality of a telecommunication service or communications link equals or exceeds a specified minimum value For satellite communication links the availability is usually expressed as a percentage of the average year See also Outage
A measure of the degree to which a system is either operating or is capable of operating at any time when used in its typical operational and support environment
The percentage of time that the services of a navigation system can be used within a particular coverage area Signal availability is the percentage of time that navigational signals transmitted from external sources are available for use Availability is a function of both the physical characteristics of the operational environment and the technical capabilities of the transmitter facilities
The extent to which information or processes are reasonably accessible and usable, upon demand, by an authorized entity, allowing authorized access to resources and timely performance of time-critical operations
During a specified period, when a power station is scheduled to generate or to be in a planned shutdown, the amount of electricity actually produced is expressed as a fraction of the electricity that would have been produced if the station had run continuously at full power throughout that period
A measure of the degree to which an item is in an operable and committable state at the start of a mission, when the mission is called for at an unknown (random) time
The portion of time that a system can be used for productive work, expressed as a percentage
The probability that a system is operational when called upon to perform its function The numerical value of availability is expressed as a probability from 0 to 1 Availability calculations take into account both the failures and the repairs of the system
the state when the system, resources, and data are in the place needed by the user, at the time the user needs them, and in the form needed by the user Availability is one of the three pillars of security -B-
Ability of a component or service to perform its required function at a stated instant or over a stated period of time It is usually expressed as the availability ratio, i e the proportion of time that the service is actually available for use by the Customers within the agreed service hours
The percentage of time for which a circuit or system is available for use Carrier class is typically 99 999% - about five minutes downtime per year
The availability of a navigation system is the percentage of time that the services are usable Availability is an indication of the ability of the system to provide usable service within the specified coverage area Signal availability is the percentage of time that navigational signals transmitted from external sources are available for use Availability is the percentage of time that navigational signals transmitted from external sources are available for use Availability is a function of both the physical characteristics of the environment and the technical capabilities of the transmitter facilities