scope:

This Recommendation considers continuous electromagnetic phenomena from 9-150 kHz. Impulsive low frequency phenomena are considered in other K-series Recommendations. Continuous phenomena above 150 kHz are covered by [ITU-T K.48].

Both the emissions of and the immunity to induced signals at frequencies from 9-150 kHz are taken into account in this Recommendation.

This Recommendation defines test set-up, measurement methods, emission limits and immunity test levels for telecommunication network equipment.

This Recommendation applies to all types of telecommunication network equipment. Due to the nature of the interference, the immunity test is applicable only to equipment having an analogue voice interface that could be influenced by disturbing signals in the voice frequency range.