K.1

[Withdrawn] Connection to earth of an audio-frequency telephone line in cable �
Deleted after its content became technically out of date

K.2

[Withdrawn] Protection of repeater power-feeding systems against interference from neighbouring electricity lines �
Deleted after its content became technically out of date

K.3

[Withdrawn] Interference caused by audio-frequency signals injected into a power distribution network �
Deleted after its content became technically out of date

K.4

[Withdrawn] Disturbance to signalling �
Deleted after its content became technically out of date

K.5

Joint use of poles for electricity distribution and for telecommunications �

K.6

Precautions at crossings �

K.7

Protection against acoustic shock �

K.8

Separation in the soil between telecommunication cables and earthing system of power facilities �

K.9

Protection of telecommunication staff and plant against a large earth potential due to a neighbouring electric traction line �

K.10

Low frequency interference due to unbalance about earth of telecommunication equipment �

K.11

Principles of protection against overvoltages and overcurrents �

K.12

Characteristics of gas discharge tubes for the protection of telecommunication installations �

K.13

Induced voltages in cables with plastic-insulated conductors �

K.14

Provision of a metallic screen in plastic-sheathed cables �

K.15

[Withdrawn] Protection of remote-feeding systems and line repeaters against lightning and interference from neighbouring electricity lines �

K.16

[Withdrawn] Simplified calculation method for estimating the effect of magnetic induction from power lines on remote-fed repeaters in coaxial pair telecommunication systems �
Rec. K.16 was withdrawn because it deals only with calculation methods contained in the "Directives - Volume II: Calculating induced voltages and currents in practical cases" without giving any limit

K.17

[Withdrawn] Tests on power-fed repeaters using solid-state devices in order to check the arrangements for protection from external interference �

K.18

Calculation of voltage induced into telecommunication lines from radio station broadcasts and methods of reducing interference �

K.19

Joint use of trenches and tunnels for telecommunication and power cables �

K.20

Resistibility of telecommunication equipment installed in a telecommunication centre to overvoltages and overcurrents �

K.21

Resistibility of telecommunication equipment installed in customer premises to overvoltages and overcurrents �

K.22

[Withdrawn] Overvoltage resistibility of equipment connected to an ISDN T/S bus �

K.23

Types of induced noise and description of noise voltage parameters for ISDN basic user networks �

K.24

Method for measuring radio-frequency induced noise on telecommunications pairs �

K.25

[Withdrawn] Protection of optical fibre cables �
This Recommendation was deleted on 2013-01-25 since its requirements have been incoroporated in revised Rec ITU-T K.47 (05/2012)

K.26

Protection of telecommunication lines against harmful effects from electric power and electrified railway lines �

K.27

Bonding configurations and earthing inside a telecommunication building �

K.28

Parameters of thyristor-based surge protective devices for the protection of telecommunication installations �

K.29

Coordinated protection schemes for telecommunication cables below ground �

K.30

[Withdrawn] Self-restoring overcurrent protectors �

K.31

[Withdrawn] Bonding configurations and earthing of telecommunication installations inside a subscriber's building �
ITU-T K.31 was deleted on 2008-08-09 after the incorporation of the relevant part of this Recommendation in ITU-T K.73 (2008)

K.32

[Withdrawn] Immunity requirements and test methods for electrostatic discharge to telecommunication equipment - Generic EMC Recommendation �
The content of this Recommendation has been superseded by ITU-T K.43 (1998) and K.48 (2000)

K.33

[Withdrawn] Limits for people safety related to coupling into telecommunications system from a.c. electric power and a.c. electrified railway installations in fault conditions �
ITU-T K.33 was deleted on 2008-08-09 after the incorporation of the relevant information contained in this Recommendation into the revised the Directives Volume VI (2008)

K.34

Classification of electromagnetic environmental conditions for telecommunication equipment - Basic EMC Recommendation �

K.35

Bonding configurations and earthing at remote electronic sites �

K.36

Selection of protective devices �

K.37

Low and high frequency electromagnetic compatibility (EMC) mitigation techniques for telecommunication installations and systems - Basic EMC Recommendation �

K.38

Radiated emission test procedure for physically large systems �

K.39

Risk assessment of damages to telecommunication sites due to lightning discharges �

K.40

Protection against lightning electromagnetic impulses in telecommunication centres �

K.41

[Withdrawn] Resistibility of internal interfaces of telecommunication centres to surge overvoltages �

K.42

General principle for the definition of emission and immunity requirements for telecommunication/ICT equipment �

K.43

[Withdrawn] Immunity requirements for telecommunication network equipment �
This Recommendation was superseded on 4 February 2023 as its contents were included in ITU-T K.136, ITU-T K.137 and other K-series Recommendations.

K.44

Resistibility tests for telecommunication equipment exposed to overvoltages and overcurrents - Basic Recommendation �

K.Imp44

Implementers' Guide for Recommendation ITU-T K.44 (2008-04) �

K.45

Resistibility of telecommunication equipment installed in the access and trunk networks to overvoltages and overcurrents �

K.46

Protection of telecommunication lines using metallic symmetric conductors against lightning-induced surges �

K.47

Protection of telecommunication lines against direct lightning flashes �

K.48

[Withdrawn] EMC requirements for telecommunication equipment - Product family Recommendation �
This Recommendation was superseded on 4 February 2023 as its contents were included in ITU-T K.136, ITU-T K.137 and other K-series Recommendations.

K.49

Test requirements and performance criteria for voice terminal telephones subject to disturbance from digital mobile telecommunications systems �

K.50

Safe limits for operating voltages and currents of telecommunication systems powered over the network �

K.51

Safety criteria for telecommunication equipment �

K.52

Guidance on complying with limits for human exposure to electromagnetic fields �

K.53

[Withdrawn] Values of induced voltages on telecommunication installations to establish telecom and a.c. power and railway operators responsibilities �
ITU-T K.53 was deleted on 2008-08-09 after the incorporation of the relevant information of this Recommendation in ITU-T K.68 (2008)

K.54

Conducted immunity test method and level at fundamental power frequencies �
El t�tulo espa�ol fue cambiado por un erratum el 09/08/2002

K.55

Overvoltage and overcurrent requirements for insulation displacement connectors (IDC) terminations �

K.56

Protection of radio base stations against lightning discharges �

K.57

Protection measures for radio base stations sited on power line towers �

K.58

EMC, resistibility and safety requirements and guidance for determining responsibility under co-located information and communication technology installations �

K.59

Electromagnetic compatibility, resistibility and safety requirements and procedures for connection to unbundled cables �

K.60

Emission levels and test methods for wireline telecommunication networks to minimize electromagnetic disturbance of radio services �

K.61

Guidance on measurement and numerical prediction of electromagnetic fields for compliance with human exposure limits for telecommunication installations �

K.62

System level radiated emissions compliance using mathematical modelling �

K.63

Maintaining the suitability of production telecommunications equipment to its intended electromagnetic environment �

K.64

Safe working practices for outside equipment installed in particular environments �

K.65

Overvoltage and overcurrent requirements for termination modules with contacts for test ports or surge protective devices �

K.66

Protection of customer premises from overvoltages �

K.67

Expected surges on telecommunications and signalling networks due to lightning �

K.68

Operator responsibilities in the management of electromagnetic interference by power systems on telecommunication systems �

K.69

Maintenance of protective measures �

K.70

Mitigation techniques to limit human exposure to EMFs in the vicinity of radiocommunication stations �

K.71

Protection of customer antenna installations �

K.72

Protection of telecommunication lines using metallic conductors against lightning - Risk management �

K.73

Shielding and bonding for cables between buildings �

K.74

Electromagnetic compatibility, resistibility and safety requirements for home network devices �

K.75

Classification of interface for application of standards on resistibility and safety of telecommunication equipment �

K.76

Electromagnetic compatibility requirements for DC power ports of telecommunication network equipment in frequencies below 150 kHz �

K.77

Characteristics of metal oxide varistors for the protection of telecommunication installations �

K.78

High altitude electromagnetic pulse immunity guide for telecommunication centres �

K.79

Electromagnetic characterization of the radiated environment in the 2.4 GHz ISM band �

K.80

EMC requirements for telecommunication network equipment in the frequency range 1 GHz-40 GHz �

K.81

High-power electromagnetic immunity guide for telecommunication systems �

K.82

Characteristics and ratings of solid-state, self-restoring overcurrent protectors for the protection of telecommunications installations �

K.83

Monitoring of electromagnetic field levels �

K.84

Test methods and guide against information leaks through unintentional electromagnetic emissions �

K.85

Requirements for the mitigation of lightning effects on home networks installed in customer premises �

K.86

Method for measuring longitudinal conversion loss (9 kHz - 30 MHz) �

K.87

Guide for the application of electromagnetic security requirements - Overview �

K.88

[Withdrawn] EMC requirements for next generation network equipment �
This Recommendation was superseded on 4 February 2023 as its contents were included in ITU-T K.136, ITU-T K.137 and other K-series Recommendations.

K.89

Protection of persons inside a structure using telecommunication services provided by metallic conductors against lightning - Risk management �

K.90

Evaluation techniques and working procedures for compliance with exposure limits of network operator personnel to power-frequency electromagnetic fields �

K.91

Guidance for assessment, evaluation and monitoring of human exposure to radio frequency electromagnetic fields �

K.92

Conducted and radiated electromagnetic environment in home networking �

K.93

Immunity of home network devices to electromagnetic disturbances �

K.94

Mutual disturbance test method for evaluating performance degradation of converged terminal devices �

K.95

Surge parameters of isolating transformers used in telecommunication devices and equipment �

K.96

Surge protective components: Overview of surge mitigation functions and technologies �

K.97

Lightning protection of distributed base stations �

K.98

Overvoltage protection guide for telecommunication equipment installed in customer premises �

K.99

Surge protective component application guide - Gas discharge tubes �

K.100

Measurement of radio frequency electromagnetic fields to determine compliance with human exposure limits when a base station is put into operation �

K.101

Shielding factors for lightning protection �

K.102

Parameters of fixed-voltage thyristor overvoltage protector components used for the protection of telecommunication installations �

K.103

Surge protective component application guide - Silicon PN junction components �

K.104

Method for identifying the transfer potential of the earth potential rise from high or medium voltage networks to the earthing system or neutral of low voltage networks �

K.105

Lightning protection of photovoltaic power supply systems feeding radio base stations �

K.106

Techniques to mitigate interference between radio devices and cable or equipment connected to wired broadband networks and cable television networks �

K.107

Method for determining the impedance to earth of earthing systems �

K.108

Joint use of poles by telecommunication and solidly earthed power lines �

K.109

Installation of telecommunication equipment on utility poles �

K.110

Lightning protection of the dedicated transformer for radio base stations �

K.111

Protection of surrounding structures of telecommunication towers against lightning �

K.112

Lightning protection, earthing and bonding: Practical procedures for radio base stations �

K.113

Generation of radiofrequency electromagnetic field level maps �

K.114

Electromagnetic compatibility requirements and measurement methods for digital cellular mobile communication base station equipment �

K.115

Mitigation methods against electromagnetic security threats �

K.116

Electromagnetic compatibility requirements and test methods for radio telecommunication terminal equipment �

K.117

Primary protector parameters for the surge protection of equipment Ethernet ports �

K.118

Requirements for lightning protection of fibre to the distribution point equipment �

K.119

Conformance assessment of radio base stations regarding lightning protection and earthing �

K.120

Lightning protection and earthing of a miniature base station �

K.121

Guidance on the environmental management for compliance with radio frequency EMF limits for radiocommunication base stations �

K.122

Exposure levels in close proximity of radiocommunication antennas �

K.123

Electromagnetic compatibility requirements for electrical equipment in telecommunication facilities �

K.124

Overview of particle radiation effects on telecommunication systems �

K.125

Dangerous effects and protective measures against electromagnetic disturbances when an Internet data centre is co-sited with a high-voltage substation �

K.126

Surge protective component application guide - High frequency signal isolation transformers �

K.127

Immunity requirements for telecommunication equipment in close proximity use of wireless devices �

K.128

Surge protective component application guide - metal oxide varistor (MOV) components �

K.129

Characteristics and ratings of silicon PN junction voltage clamping components used for the protection of telecommunication installations �

K.130

Neutron irradiation test methods for telecommunication equipment �

K.131

Design methodologies for telecommunication systems applying soft error measures �

K.132

Electromagnetic compatibility requirements of electromagnetic disturbances from lighting equipment located in telecommunication facilities �

K.133

Electromagnetic environment of body-worn equipment in the 2.4 GHz and 13.56 MHz industrial, scientific and medical band �

K.134

Protection of small-size telecommunication installations with poor earthing conditions �

K.135

Technical parameters for residual current operated protective devices with automatic reclosing feature for telecom applications �

K.136

Electromagnetic compatibility requirements for radio telecommunication equipment �

K.137

Electromagnetic compatibility requirements and measurement methods for wireline telecommunication network equipment �

K.138

Quality estimation methods and application guidelines for mitigation measures based on particle radiation tests �

K.139

Reliability requirements for telecommunication systems affected by particle radiation �

K.140

Surge protective component application guide - Fuses �

K.141

Electromagnetic compatibility requirements for information perception equipment �

K.142

Lightning protection and earthing of video surveillance systems �

K.143

Guidance on safety relating to the use of surge protective devices and surge protective components in telecommunication terminal equipment �

K.144

Surge protective component application guide - Self-restoring thermally activated overcurrent protectors �

K.145

Assessment and management of compliance with radio frequency electromagnetic field exposure limits for workers at radiocommunication sites and facilities �

K.146

Interference management for telecommunication transmissions over copper lines for signals other than speech �

K.147

Protection of digital ports connected to balanced pairs of conductors �

K.148

Multiservice surge protective device application guide �

K.149

Passive intermodulation test methods of array antenna systems in mobile communication systems �

K.150

Information of semiconductor devices required for the design of telecommunication equipment applying soft error mitigation measures �

K.151

Electrical safety and lightning protection of medium voltage input and up to �400 VDC output power system in ICT data centres and telecommunication centres �

K.152

Electromagnetic compatibility requirements for power equipment in telecommunication facilities �

K.153

Guidance on determining the compliance boundaries (exclusion zones) of radio transmitter installations �

K.154

Operating telecommunication facilities using lightning strikes data obtained from lightning location systems �

K.155

Performance Requirements and Test Methods for Surge Protective Modules Used in AC power port of Telecommunication Equipment �

K.156

Time and spatial averaging in RF-EMF exposure assessment �

K.157

Electromagnetic compatibility requirements and test methods for satellite communication terminal equipment �

K.Sup30

ITU-T K.118 - Requirements for lightning protection of fibre to the distribution point equipment - Overview �

K.Sup27

The 100 kHz ring wave generator �

K.Sup1

ITU-T K.91 - Guide on electromagnetic fields and health �

K.Sup2

ITU-T K.52 - Calculator for equivalent isotropic radiated power as described in Recommendation ITU-T K.52 �

K.Sup3

ITU-T K.20, K.21, K.45, K.82 - Additional criteria to protect telecommunication cabling during a power cross event �

K.Sup4

ITU-T K.91 - Electromagnetic field considerations in smart sustainable cities �

K.Sup5

ITU-T K.81 - Estimation examples of the high-power electromagnetic threat and vulnerability for telecommunication systems �

K.Sup6

ITU-T K.115 - Measuring shielding effectiveness using normalized site attenuation in free space �

K.Sup7

ITU-T K.44 - AC supply configurations �

K.Sup8

Resistibility analysis of 5G systems �

K.Sup9

5G technology and human exposure to radiofrequency electromagnetic fields �

K.Sup10

Analysis of electromagnetic compatibility aspects and definition of requirements for 5G mobile systems �

K.Sup11

ITU-T K.131 - Soft error measures for field programmable gate arrays �

K.Sup12

ITU-T K.51 - Potential hazards of narrow pin spacing in connectors �

K.Sup13

Radiofrequency electromagnetic field (RF-EMF) exposure levels from mobile and portable devices during different conditions of use �

K.Sup14

The impact of RF-EMF exposure limits stricter than the ICNIRP or IEEE guidelines on 4G and 5G mobile network deployment �

K.Sup15

ITU-T K.20, K.21 and K.44 - Internal DC powering interface surge testing factors �

K.Sup16

Electromagnetic field compliance assessments for 5G wireless networks �

K.Sup17

ITU-T K.44 - Test conditions and methods information �

K.Sup18

ITU-T K.44 - Causes of telecommunication system overvoltage and overcurrent conditions and their expected levels �

K.Sup19

Electromagnetic field (EMF) strength inside underground railway trains �

K.Sup20

ITU-T K.91 - Supplement on radiofrequency exposure evaluation around underground base stations �

K.Sup21

ITU-T K.21 - Rationale for setting resistibility requirements of telecommunication equipment installed in customer premises against lightning �

K.Sup22

ITU-T K.45 - Rationale for setting resistibility requirements of telecommunication equipment installed in the access and trunk networks against lightning �

K.Sup23

Ethernet port surge voltages and currents �

K.Sup24

ITU-T K.20 - Rationale for setting resistibility requirements of telecommunication equipment installed in a telecommunication centre against lightning �

K.Sup25

ITU-T K.117 - Long reach single twisted-pair Ethernet resistibility testing �

K.Sup26

ITU-T K.114 - Analysis of electromagnetic compatibility requirements and test methods of 5G active antenna system base stations �

K.Sup28

Electric shock and related terms and definitions �

K.Sup29

Electromagnetic field strength inside and outside of electric vehicles using wireless power transfer technology �

K.Sup31

ITU-T K.118 - Requirements for lightning protection of fibre to the distribution point equipment - Modelling earth potential rise �

K.Sup32

Case studies of radio frequency- electromagnetic field (RF-EMF) assessment �