Telecom Standards: ITU-T K Series: Protection Against Interference

The ITU K series are recommendations for Protection against Interference. The K recommendations cover every aspect of the telecommunications system and include protection components.
The K series recommendations are comprised of the following:

  • 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 telecommunications 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 telecommunications 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 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 LEMP in telecommunications centres
  • K.42: Preparation of emission and immunity requirements for telecommunication equipment – General principles
  • 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
  • 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 of operating voltages and currents for 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 telecommunication installations
  • K.59: EMC, 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: EMC, 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: EMC requirements for telecommunication network equipment (9 kHz-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 (1 GHz - 6 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: 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
"ITU-T Recommendations." ITU. N.p., n.d. Web. Retrieved on 25 Nov. 2013
"Application Note: ITU K Series Telecommunications Recommendations." N.p., n.d. Web. Retrieved on 25 Nov. 2013.