UNLIMITED FREE ACCESS TO THE WORLD'S BEST IDEAS

close
Already an Engineering360 user? Log in.

This is embarrasing...

An error occurred while processing the form. Please try again in a few minutes.

Customize Your Engineering360 Experience

close
Privacy Policy

This is embarrasing...

An error occurred while processing the form. Please try again in a few minutes.

ITU-T X.500

Information technology – Open Systems Interconnection – The Directory: Overview of concepts, models and services

active, Most Current
Buy Now
Organization: ITU-T
Publication Date: 1 October 2019
Status: active
Page Count: 30
scope:

The Directory provides the directory capabilities required by many application layer standards and telecommunication services. Among the capabilities which it provides are those of "user-friendly naming", whereby objects can be referred to by names which are suitable for citing by human users (though not all objects need have user-friendly names); and "name-to-address mapping" which allows the binding between objects and their locations to be dynamic. The latter capability allows networks, for example, to be "self-configuring" in the sense that addition, removal and the changes of object location do not affect network operation.

The Directory is not intended to be a general-purpose database system, although it may be built on such systems. It is assumed, for instance, that, as is typical with communication directories, there is a considerably higher frequency of "queries" than of updates. The rate of updates is expected to be governed by the dynamics of people and organizations, rather than, for example, the dynamics of networks. There is also no need for instantaneous global commitment of updates; transient conditions, where both old and new versions of the same information are available, are quite acceptable.

It is a characteristic of the Directory that, except as a consequence of differing access rights or un-propagated updates, the results of directory queries will not be dependent on the identity or location of the inquirer. This characteristic renders the Directory unsuitable for some telecommunication applications, for example some types of routing. For cases where the results are dependent on the identity of the inquirer, access to directory information and updates of the Directory may be denied.

Document History

ITU-T X.500
October 1, 2019
Information technology – Open Systems Interconnection – The Directory: Overview of concepts, models and services
The Directory provides the directory capabilities required by many application layer standards and telecommunication services. Among the capabilities which it provides are those of "user-friendly...
October 1, 2016
Information technology – Open Systems Interconnection –The Directory: Overview of concepts, models and services
The Directory provides the directory capabilities required by OSI applications, OSI management processes, other OSI layer entities, and telecommunications services. Among the capabilities which it...
October 1, 2012
Information technology – Open Systems Interconnection – The Directory: Overview of concepts, models and services
A description is not available for this item.
November 1, 2008
Information technology – Open Systems Interconnection – The Directory: Overview of concepts, models and services
A description is not available for this item.
August 1, 2005
Information technology – Open Systems Interconnection – The Directory: Overview of concepts, models and services
A description is not available for this item.
February 1, 2001
Informations Technology - Open Systems Interconnection - The Directory: Overview of Concepts, Models, and Services Series X: Data Networks and Open System Communications Directory
A description is not available for this item.
August 1, 1997
Information Technology - Open Systems Interconnection - The Directory: Overview of Concepts, Models, and Services - Series X: Data Networks and Open System Communications Directory
A description is not available for this item.
January 1, 1993
Information Technology - Open Systems Interconnection - The Directory: Overview of Concepts, Models, and Services - Data Networks and Open System Communications Directory
A description is not available for this item.
January 1, 1989
Directory - Overview of Concepts, Models and Services - Data Communication Networks Directory (Study Group VII) 17 pp
A description is not available for this item.

References

Advertisement