non-TMN environment. Note: The TF consolidates and extends the functionality and scope associated with the mediation and Q adaption function blocks in ITU-T Rec. 3010 (Ref. 20). 21.9 TMN FUNCTIONAL ARCHITECTURE 21.9.2 TMN Functionality Management Application Functionality. The management application functionality (MAF) represents (part of) the functionality of one or more TMN management services. ITU-T Rec. M.32xx-series enumerates the MAFs with respect to the technologies and services supported by the TMN. The management application functionality (MAF) may be identified with the type of TMN function block in which they are implemented. The following MAFs may be identified: Operations systems functionality (OSF) Management application function (OSF-MAF) Network element functionality-management application function (NEF-MAF) Transformation functionality (TF) Management application function (TF-MAF) Workstation functionality-management application function (WSF-MAF) Support Functionality. Support functions may optionally be found in a TMN function block. The support functionality is potentially common to more than one TMN function block within an implemented TMN. Some support functionality assist the MAF within a TMN function block in its interactions with other function blocks. 21.9.3 TMN Reference Points A TMN reference point delineates one of several external views of functionality of a function block; it defines that function block's service boundary. This external view of functionality is captured in the set of TMN management functions that will have visibility from the function block. Reference points have meaning in functional specification leading to an implemen- tation. A reference point can represent the interactions between a particular pair of function blocks. Table 21.4 shows the relationships between the function blocks in terms of reference points between them. The reference point concept is important because it Table 21.4 Relationships Between Logical Function Blocks Expressed as Reference Points no