n-TMN non-TMN ax reference point only applies when each OSF is in a different TMN. bThe g reference point lies between the WSF and the human user. 'The m reference point lies between the TF and the telecommunication functionality. Note: Any function may communicate at a non-TMN reference point. These non-TMN reference points may be standardized by other groups/organizations for particular purposes. Source: Table 1/M.3010, page 13, Ref. 20. NETWORK MANAGEMENT represents the aggregate of all of the abilities that a particular function block seeks from another particular function block, or the equivalent function blocks. It also represents the aggregate of all the operations and/or notifications (as defined in ITU-T Rec. X.703 (Ref. 23) that a function block can provide to a requesting function block. A TMN functionality specified reference point usually corresponds to a to-be-imple- mented physical interface, in the physical architecture, if and only if the function blocks are implemented in different physical blocks. 21.10 NETWORK MANAGEMENT IN ATM The ITU-T (CCITT) organization and ANSI have left local network management proce- dures in the M-plane for "further study." In the interim period until CCITT and ANSI have formulated such standards, SNMP and the ATM UNI Management Information Base (MIB) are required to provide any ATM user device with status and configuration information concerning virtual path and channel connections available at its UNI. (See Chapter 20 for a discussion of ATM and clarification of the acronyms used here.) The ATM Forum has developed the ILMI (Interim Local Management Interface Spec- ification). The ILMI fits into the overall management model for an ATM device shown in Figure 21.15 as clarified by the following principles and options. 1. Each ATM device supports one or more UNIs. 2. ILMI functions for a UNI provide status, configuration, and control information about link and physical layer parameters. 3. ILMI functions for a UNI also provide for address registration across the UNI. 4.