This page features FIX Protocol Session Layer specifications and presentations.
With the release of FIX Protocol Version 5.0 the session layer specification was separated from the application layer specification (aka Transport Independence). "FIXT" is the label used to identify the separate session layer specification and to identify the FIX Session version being used.
With the release of FIX 5.0 the FIX Transport 1.1 (FIXT.1.1) was released. The FIXT specifications are here along with descriptions of changes.
*New* High performance session layer technical standard which is currently in Release Candidate 3 as part of the technical standards review process.
A full list of current and past files for FIX Performance Session Layer can be found here.
*New* Standard for message framing of FIX and non-FIX encodings
A full list of current and past files for FIX Simple Open Framing Header can be found here.
For specifications of FIX Session Layer definitions for versions FIX 4.4 and older please refer to the appropriate FIX Protocol Application Layer Specification.
Presentations providing overviews of the FIX Session layer.