Scope and Object This EMC standard specifies limits and methods of measurement for disturbance emissions emanating from wire-line telecommunication networks as defined in Clause 3@ including their in-house extensions@ installed and operated as intended. This standard covers the frequency range 9 kHz to 400 GHz. To date@ it specifies limits and methods of measurement for conducted and radiated disturbances from telecommunication networks in the frequency range 150 kHz to 1 GHz. The assessment of a network needs to be performed only in the frequency ranges where limits are defined. The limits set in this standard do not apply to wanted emissions from radio transmitters. The emission requirements have been selected so as to ensure that disturbances generated by a network@ or parts thereof@ operating normally do not exceed a level that could prevent other apparatus from operating as intended. Fault conditions of the network are not taken into account. Not all disturbance phenomena have been included for testing purposes in this standard but only those considered as relevant for the network covered by this standard. These test requirements represent essential electromagnetic compatibility emission requirements. NOTE In special cases@ situations will arise where the levels specified in this standard will not offer adequate protection; for example where a sensitive receiver is used in close proximity to a network. In these instances@ special mitigation measures may have to be employed.