Overview of series of Recommendations (standards) developed by the Standardization Sector of the International Telecommunication Union (ITU-T).
| Series | Description |
|---|---|
| A | Organization of the work of ITU-T |
| B | Means of expression: definitions, symbols, classification |
| C | General telecommunication statistics |
| D | General tariff principles |
| 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 programme 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 and network maintenance |
| N | Maintenance: international sound programme and television transmission circuits |
| O | Specifications of measuring equipment |
| P | Telephone transmission quality, telephone installations, local line networks |
| Q | Switching and signalling |
| 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, open system communications and security |
| Y | Global information infrastructure, Internet protocol aspects and next-generation networks |
| Z | Languages and general software aspects for telecommunication systems |
Subcategories
This category has the following 10 subcategories, out of 10 total.