ITU-T K.137 PDF

This Recommendation applies to wireline telecommunication equipment with a rated root mean square (RMS) alternating current (AC) or direct current (DC) supply voltage not exceeding 600 V.

This Recommendation specifies the electromagnetic compatibility (EMC) common requirements and test methods for wireline telecommunication network equipment, used in public telecommunication networks to provide telecommunication services such as: voice, data, audio and video to end-users, using all applicable media and all types of wireline access technologies.

[ITU-T K.136] applies to radio functions of wireline equipment.

Test conditions for the following types of wireline telecommunication network equipment, as described in Annex C, are defined:

– Access equipment;

– IP equipment: router and switching;

– Optical transmission network equipment;

– Data centre and cloud computing equipment;

– Switching equipment.

Telecommunication network equipment incorporating secondary radio functions (e.g., for equipment configuration, network management) are also covered by this Recommendation.

NOTE – The requirements applicable to radio interfaces of telecommunication network equipment are defined in [ITU-T K.136]

Equipment may provide different functions, i.e., switching equipment may also provide transmission functions and transmission equipment may provide storage capabilities etc. All available functions of the equipment under test (EUT), as described in Annexes D to H, are to be tested.

The environmental classification locations used in this Recommendation refer to [ITU-T K.34].

This Recommendation defines the specific immunity testing levels and performance criteria to be applied to wireline network telecommunication equipment in the following environments:

– Telecommunication centres; see clauses 6.1.1 and 6.1.2 of [ITU-T K.34]

– Outdoor locations (e.g., streets, rooftop parking, towers, poles): see clause 6.2 of [ITU-T K.34]

– Customer premises (residential, commercial or light-industrial environment): see clause 6.3 of [ITU-T K.34].

The immunity requirements of this Recommendation have been selected to ensure an adequate level of immunity; extreme cases of disturbances with a low probability of occurrence are not considered. In special cases, situations may arise where the levels of disturbance may exceed the immunity test levels defined in this Recommendation. In these conditions, special mitigation measures or protection may have to be implemented.

The emission requirements of this Recommendation refer to the classification provided in [CISPR 32].