Real Data Transport
Real Data Transport (RDT) is a proprietary transport protocol for the actual audio/video data, developed by RealNetworks in the 1990s. It is commonly used in companion with a control protocol for streaming media like the IETF's RTSP protocol.
As reported in a 2002 book about firewalls, RDT used two uni-directional UDP connections, one for the data sent from the server to the client and another in the opposite direction for retransmission requests. The same book reported that RealNetworks' G2 server used RDT in this configuration by default. Another 2003 book reported that RDT was also seen carried over TCP, as a fall-back mechanism.
RDT is now included as part of the Helix Community project.
- Helix Community RDT implementation, C++ source code repository.
- RDT v2 protocol specs from Helix Community
- RDT v3 protocol specs from Helix Community
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