This Recommendation specifies resistibility requirements and test procedures for telecommunication equipment which is attached to or installed within a customer premises building. The requirements of this Recommendation assume that earthing and bonding is in accordance with [ITU-T K.66].

The types of equipment covered by this Recommendation includes all types of telecommunication equipment, e.g., modems, telephones, routers, XDSL, etc. This Recommendation is not meant to apply to PCs and printers, etc.

This Recommendation applies to both external and internal ports. Basic [ITU-T K.44] (test methods and test circuits) is an integral part of this Recommendation. It should be read in conjunction with [ITU-T K.11] and [ITU-T K.39].