- 국제전기통신연합 전기통신표준화부문, International Telecommunication Union Telecommunication Standardization Sector
| 호칭 | 제목 |
|---|---|
| SG 2 | Network and service operation |
| SG 3 | Tariff and accounting principles including related telecommunications economicand policy issues |
| SG 4 | TMN and network maintenance |
| SG 5 | Protection against electromagnetic environment effects |
| SG 6 | Outside plant |
| SG 7 | Data networks and open system communications |
| SG 8 | Characteristics of telematic systems |
| SG 9 | Television and sound transmission |
| SG 10 | Languages and general software aspects for telecommunication systems |
| SG 11 | Signalling requirements and protocols |
| SG 12 | End-to-end transmission performance of networks and terminals |
| SG 13 | General network aspects |
| SG 15 | Transport networks, systems and equipment |
| SG 16 | Multimedia services and systems |