This diagram represents only one of several possible interpretation of the standard and ignores actions and events unrelated to loop recovery or to widely ignored aspects of Annex I.2.2. Entry actions are always executed using the state of the variables upon entry. Entry action are shown in the diagram as boxed in statements within the box representing the state.
Transitions are instantaneous.
Braces around a function, block or action indicate that its execution is optional and may not take place. The LPB portion of Annex I.2.2 is not included in the state diagram. State Diagram for loop initialization and portions of Annex I.2.2 Description of Variables Annex I.2. A variable which is maintained by the state machine monitoring the receiver. On power up it is set to f7.