Atec Haefely-AXOS Series - Manual (Page 4)

4 AXOS SERIES
THE STANDARDS
IEC/EN 61000-4-5 Telecom Wave 10/700µs / ITU K.20, K.21, K.44, K.45
Telecommunication networks and lines are often disposed to lightning strikes
and their associated effects. All telecommunication systems linked with lines in-
IEC/EN 61000-4-12 Ring Wave / IEEE C62.41
Ring waves are used to simulate lightning or switching effects in domestic
single or three phase supplies within an adequately protected building.
The waveform has similar characteristics in both open and short circuit
conditions. The ring wave is characterised as a bipolar damped oscillating
wave.