Description: The diagnostics test mode allows the user to select a basic(1), advanced(2) or stress(3) series of powerup self tests to be run when the acModuleOpStatus field is changed to selfTesting(4). A basic(1) test performs a quick self test and is the mode which is by default selected at powerup. Advanced(2) mode is used to run a more thorough series of tests and stress(3) mode is used to execute a system test packet loopback type of powerup test. In all test modes, the acModuleDiagStatus field contains a unique results code (Refer to diagnostics utility guide). The results of a test request is also written as a string to the acModuleDiagResultString field.