The purpose of Recommendation J.67 is to give the tools of the transmission methodology of the MAC packet family signals. Section 1 is devoted to the traditional MAC packet signals (D/D2), while Section 2 deals with the high‑definition television systems HD-MAC.
Each part of this Recommendation begins with the definition of the test signals and the test lines that are the basis of the transmission methodology. To have the best compatibility with the MAC signals, test lines for HD-MAC are as close as possible to the test signals previously defined in Section 1, but nevertheless slightly different, due to the different nature of HD-MAC. Furthermore, the main quality measurement parameters are defined, as well as the corresponding application methods.
Section 2 of this new version of the Recommendation replaces the previous part B, the contents of which were only subclause titles with text “to be defined”.