Generalized Timing Formula
The video parameters defined by the standard include horizontal blanking (retrace) and vertical blanking intervals, horizontal frequency and vertical frequency (collectively, pixel clock rate or video signal bandwidth), and horizontal/vertical sync polarity.
These parameters are used by the XFree86 Modeline, for example.
This video timing standard is available from VESA for 350 USD. 
The standard was adopted in 1999, and was superseded by the Coordinated Video Timings specification in 2002.
- Coordinated Video Timings
- Extended display identification data, as it can interact with the video card with respect to providing information on permissible timings.
- VESA: spreadsheet for calculating parameters of GTF signal (registration required, but free)
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