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[Withdrawn] Connection to earth of an audio-frequency telephone line in cable
		  Deleted after its content became technically out of date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[Withdrawn] Protection of repeater power-feeding systems against interference from neighbouring electricity lines
		  Deleted after its content became technically out of date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[Withdrawn] Interference caused by audio-frequency signals injected into a power distribution network
		  Deleted after its content became technically out of date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[Withdrawn] Disturbance to signalling
		  Deleted after its content became technically out of date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[Withdrawn] Protection of remote-feeding systems and line repeaters against lightning and interference from neighbouring electricity lines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[Withdrawn] Simplified calculation method for estimating the effect of magnetic induction from power lines on remote-fed repeaters in coaxial pair telecommunication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 K.16 was withdrawn because it deals only with calculation methods contained in the "Directives - Volume II: Calculating induced voltages and currents in practical cases" without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[Withdrawn] Tests on power-fed repeaters using solid-state devices in order to check the arrangements for protection from external interference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 título español 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 ports 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.158 
 | 
Practical guidance for protection of the indoor distribution system for mobile communication in large-scale physical buildings
		 
  | 
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
		 
  |