The Telecommunications Technology Committee (TTC) is a Japanese standardisation body that is responsible for the standardisation of telecommunications technologies in the fields of:
- Inter-network Transmission
- ISDN Inter-network Signalling
- Packet / Frame Relay
- Mobile Communications
- Inter-Carrier Signaling Interface
- ISDN User-Network Interface
- B-ISDN
- PBX
- LAN
- MHS / OSI
- Telematics
- Infrared Communications
- Network Management
- Voice Coding
- Video Coding / AV Communications