| D |
Tariff and accounting principles and international telecommunication/ICT 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 programme and other multimedia signals |
| K |
Protection against interference |
| L |
Environment and ICTs, climate change, e-waste, energy efficiency; 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, and associated measurements and tests |
| 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, next-generation networks, Internet of Things and smart cities |
| Z |
Languages and general software aspects for telecommunication systems |