The tmnxEqSyncIfTimingSystemQuality notification is generated when there is a change in the system timing quality level for the satellite. This notification is a point-in-time state change event. [CAUSE] This notification may be triggered for the following reasons: 1) There has been a switch in the timing reference in use by the network element, either because the previously active timing reference was disqualified, or to ensure that the network element is using the timing reference with the best timing quality. 2) There has been a change in the active timing reference's quality and the change does not result in a timing reference switch. 3) The network element has transitioned into or out of the holdover state. [EFFECT] The system quality level is used to determine the SSM code transmitted on synchronous interfaces. This may affect the SSM code transmitted on some or all interfaces, which may affect the distribution of timing throughout the network. [RECOVERY] If the customer is expecting the system to be locked to a reference of a particular quality and the system quality has decreased, the customer will need to determine the root cause (for example, loss of communication with a satellite) and resolve the issue.