The International Telecommunication Union (ITU) publishes a vast range of documents categorized under different series, each dedicated to specific subjects in the field of telecommunications or information technology. Below are some key document series published by ITU.
The following is a summary table of all the ITU document categories.
| Series | Description |
|---|---|
| A | Administrative issues and policies |
| B | Telegraphy |
| C | Radiocommunications (ITU-R) |
| D | Tariff and accounting principles including related telecommunication economic and policy issues |
| E | Overall network operation, telephone service, service operation and human factors |
| F | Non-telephone telecommunication services |
| G | Transmission systems and media, digital systems and networks |
| H | Audiovisual and multimedia systems |
| I | Integrated services digital network |
| J | Cable networks and transmission of television, sound program and other multimedia signals |
| K | Protection against interference |
| L | Construction, installation and protection of cables and other elements of outside plant |
| M | Telecommunication management, including TMN |
| N | Maintenance: international sound program and television transmission circuits |
| O | Specifications of measuring equipment |
| P | Telephone transmission quality, telephone installations, local line networks |
| Q | Switching and signaling |
| R | Telegraph transmission |
| S | Telegraph services terminal equipment |
| T | Terminals for telematic services |
| U | Telegraph switching |
| V | Data communication over the telephone network |
| X | Data networks and open system communications |
| Y | Global Information Infrastructure, Internet protocol aspects and Next-Generation Networks |
| Z | Languages and general software aspects for telecommunication systems |
The A series comprises documents related to administrative issues and policies, including documents from the ITU Council and other high-level meetings.
This series covers the guidelines, standards and technical requirements related to telegraphy.
The C Series includes decisions, resolutions and other formal results from World and Regional Radiocommunication Conferences.
D Series - Tariff and accounting principles including related telecommunication economic and policy issues
The D series concerns tariff and accounting issues, including costing methodologies, economic, and policy-related matters across telecommunication services.
The E series provides recommendations for telephone service, network operation, service operations, and human factors.
The F series covers various non-telephone telecommunication services like facsimile, data communication, telegraph services, and teletex services.
The G series focuses on standards for digital networks and transmission systems and media. This includes systems and networks, line transmission of traditional and digital signals, and optical technology for networks.
The H series covers standards for designing and implementing audiovisual and multimedia systems.
The I series pertains to the integrated services digital network (ISDN) and its related aspects.
J Series - Cable networks and transmission of television, sound programme and other multimedia signals
The J series provides standards for cable networks and transmission of television, sound programs, and other multimedia signals.
The K series focuses on protection from interference, which includes protection from environmental factors that can inhibit communication signals.
The L series provides guidelines on the construction, installation, and protection of cables and other outside plant elements.
The M series offers guidelines for telecommunication management, including the Telecommunication Management Network (TMN).
The N series focuses on the maintenance of international sound programming and television transmission circuits.
The O series offers specifications for measuring equipment used in telecommunications.
The P series covers various aspects of telephone transmission quality, telephone installations, and local line networks.
The Q series covers standards related to switching and signaling in telecommunication systems.
The R series covers standards for telegraph transmission.
The S series offers standards for terminal equipment used in telegraph services.
The T series provides standards for the terminals used for telematic services.
The U series covers standards related to telegraph switching.
The V series pertains to standards for data communication over the telephone network.
The X series provides standards and protocols for data networks and open systems communication.
Y Series - Global Information Infrastructure, Internet protocol aspects and Next-Generation Networks
The Y series covers standards for global information infrastructure, internet protocol aspects, and next-generation networks.
The Z series provides standards for programming languages and general software aspects for telecommunication systems.
These recommendations and guidelines issued by the ITU play a vital role in the development and smooth functioning of global telecommunications and IT networks.