scope:

This Recommendation considers continuous electromagnetic phenomena applicable on direct current (DC) power ports of telecommunication network equipment in frequencies below 150 kHz. Electromagnetic phenomena above 150 kHz are covered by other specific product family Recommendations such as [ITU-T K.136] and [ITU-T K.137]. Impulsive low frequency phenomena are considered in other K-series Recommendations.

Both the emissions and the immunity requirements in frequencies below 150 kHz are taken into consideration in this Recommendation.

This Recommendation defines test set-ups, measurement methods, emission limits and immunity test levels for power ports of 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.