Periodic tests

• Usually performed hourly by maintenance software

• Nondestructive (not service-affecting)

• Run during high-traffic periods without interfering with calls

Scheduled tests

• Usually performed daily

• More thorough than periodic testing

• Destructive (service-affecting)

• Run only during off-hours to avoid service disruptions

Fixed-interval tests

• Performed at regular time intervals and cannot be administered

• Run concurrently with periodic maintenance