ITU-T K.20 PDF

This Recommendation specifies resistibility requirements and test procedures for equipment installed in a telecommunication centre where the earthing, bonding and cabling between equipment/racks is in accordance with [ITU-T K.27]. This Recommendation applies to both external and internal ports. [ITU-T K.44] is an integral part of this Recommendation and should be read in conjunction with [ITU-T K.11], [ITU-T K.39] and [ITU-T K.46].

This Recommendation applies to all telecommunication equipment, whether network operator or customer owned, including telephony, routers and modems, etc. It does not apply to personal computers and printers, etc.