Upon application of power the timer resets, enters the ON state for a period T1, then switches OFF for a period T2. This cycle repeats until power is removed.
Upon application of power the timer resets and enters the OFF state for a period T2, then switches ON for a period T1. This sequence repeats until power is removed.
Upon application of power the timer enters the OFF state for a period T2, then switches ON for a period T1. It then switches OFF & remains OFF indefinitely.