The parameters, as defined in G.994.1, are generic and the data structure is used in all messages where parameters are communicated. The parameters have two types of classifications: NPars and SPars.
Level 1 is the highest level in the tree, which contains an array of NPars and SPars. The general notation for parameters defined at Level 1 is NPar(1) and SPar(1). Each of the SPar(1) parameters have a set of NPars and SPars at Level 2, identified as NPar(2) and SPar(2) parameters, respectively. Because Level 3 is the lowest level in the three-level tree structure, there can be no SPar values at Level 3. In Figure 5.5, the general notation is as follows :
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