In telecommunication, waner are long-term random variations of the significant instants of a digital signal from their ideal positions. Phase variations with a frequency content above 10 Hz are considered jitter, while those with a frequency below 10 Hz are referred to as wander. Wander variations are those that occur over a period greater than 1 s (second). Jitter, swim, wander, and drift have increasing periods of variation in that order.