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ITU-T Recommendations
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ITU-T Recommendations by series
Select a series of Recommendations
A series: Organization of the work of ITU-T
D series: Tariff and accounting principles and international telecommunication/ICT economic and policy issues
E series: Overall network operation, telephone service, service operation and human factors
F series: Non-telephone telecommunication services
G series: Transmission systems and media, digital systems and networks
H series: Audiovisual and multimedia systems
I series: Integrated services digital network
J series: Cable networks and transmission of television, sound programme and other multimedia signals
K series: Protection against interference
L series: Environment and ICTs, climate change, e-waste, energy efficiency; construction, installation and protection of cables and other elements of outside plant
M series: Telecommunication management, including TMN and network maintenance
N series: Maintenance: international sound programme and television-transmission circuits
O series: Specifications of measuring equipment
P series: Telephone transmission quality, telephone installations, local line networks
Q series: Switching and signalling, and associated measurements and tests
R series: Telegraph transmission
S series: Telegraph services terminal equipment
T series: Terminals for telematic services
U series: Telegraph switching
V series: Data communication over the telephone network
X series: Data networks, open system communications and security
Y series: Global information infrastructure, Internet protocol aspects, next-generation networks, Internet of Things and smart cities
Z series: Languages and general software aspects for telecommunication systems
K series
: Protection against interference
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.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.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.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.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.42
:
General principle for the definition of emission and immunity requirements for telecommunication/ICT equipment
Withdrawn:
K.43
: Immunity requirements for telecommunication network equipment
K.44
:
Resistibility tests for telecommunication equipment exposed to overvoltages and overcurrents – Basic Recommendation
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
Withdrawn:
K.48
: EMC requirements for telecommunication equipment – Product family Recommendation
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.54
:
Conducted immunity test method and level at fundamental power frequencies
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
Withdrawn:
K.88
: EMC requirements for next generation network equipment
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 supplements
: Supplements to ITU-T K-series Recommendations
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