10 Telecom Wave (Axos
8
only)
10.1 General Information
This impulse is characterised as a telecom wave impulse as well as 10/700 impulse. The reason
is that under OCV condition the front time is defined with 10µs and time to half value is 700 µs.
The main difference to the Combination Wave generator is the front time and time to half value.
The basic standard body is the IEC 61000-4-5, similar to the Combination Wave generator. There
the impulse form is defined. Further important standards are the ITU K.20, K.21,
K.44 and K.45. The impulse gets applied only to communication line. To be able to apply this
impulse wave form to the EUT an external telecom wave TW 8 module is required.
10.1.1 Open Circuit Voltage (OCV) Telecom Wave
Figure 10-1: Open Circuit Voltage (OCV) Telecom Wave
Front time: Tf = 1,67 x T = 10µs ± 30%
Duration: Td = Tw = 700 µs ± 20%
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