This attribute specifies whether or not a bus clock source test is automatically executed after a clock source's LP state changes, and after failure or recovery of the active CP bus clock source. Since tests of an alternate bus clock source may cause a minor loss of traffic, the attribute is set to disabled by default. If set to enabled, a bus clock source test is automatically executed. If the status of the corresponding Shelf Bus clockSourceStatus is changed after the test, an alarm is issued if the status is one of the following: ok, failed, or unknown. If set to disabled, no bus clock source test is automatically executed. However, a test can be executed by the RUN command. If the status is changed after the test, an alarm is issued if the status is one of the following: ok, or failed.