Editing ITU-T (section)

== Series and Recommendations ==
ITU-T Recommendations are the names given to telecommunications and computer protocol specification documents published by ITU-T.

=== Recommendation categorization ===
ITU-T assigns each Recommendation a name based on the series and Recommendation number. The name starts with the letter of the series the Recommendation belongs to. Each series encompasses a broad category of Recommendations, such as "H-Series Recommendations: Audiovisual and multimedia systems". The series letter is followed by a period and the Recommendation number, which uniquely identifies the Recommendation within the series. Often, a range of related Recommendations are further grouped within the series and given adjacent numbers, such as "H.200-H.499: Infrastructure of audiovisual services" or "H.260-H.279: Coding of moving video".<ref>{{Cite web |title=ITU-T Recommendation series structure |url=https://www.itu.int:443/en/ITU-T/publications/Pages/structure.aspx |access-date=2022-11-01 |website=ITU |language=en-US}}</ref> Many numbers are "skipped" to give room for future Recommendations to be adjacent to related Recommendations. Recommendations can be revised or "superseded" and keep their existing Recommendation number.

=== Individual ITU-T Recommendations ===
Source:<ref>{{cite web |title=ITU Publications : Standardization (ITU-T) |url=https://www.itu.int/en/publications/ITU-T/Pages/default.aspx |website=ITU PUBLICATIONS |publisher=ITU |access-date=19 April 2025}}</ref>
{{ordered list|type=upper-alpha
| Organization of the work of ITU-T
| Means of expression: definitions, symbols, classification
| General telecommunication statistics
| General tariff principles
| Overall network operation, telephone service, service operation and human factors
| Non-telephone telecommunication services
| Transmission systems and media, digital systems and networks
| Audiovisual and multimedia systems
| Integrated services digital network
| Cable networks and transmission of television, sound programme and other multimedia signals
| Protection against interference
| Construction, installation and protection of cables and other elements of outside plant
| TMN and network maintenance: international transmission systems, telephone circuits, telegraphy, facsimile and leased circuits
| Maintenance: international sound programme and television transmission circuits
| Specifications of measuring equipment
| Terminals and subjective and objective assessment methods
| Switching and signalling
| Telegraph transmission
| Telegraph services terminal equipment
| Terminals for telematic services
| Telegraph switching
| Data communication over the telephone network
| Data networks and open system communications
| Global information infrastructure and Internet protocol aspects
| Languages and general software aspects for telecommunication systems
}}