ITU-T K Series Recommendations: New Documents

[ K.20 (11/88) ] - Resistibility of telecommunication switching equipment to overvoltages and overcurrents

mer, 17 jan 2012 13:39:30 GMT

Resistibility of telecommunication switching equipment to overvoltages and overcurrents

[ K.20 (11/88) ] - Resistibility of telecommunication switching equipment to overvoltages and overcurrents

mer, 17 jan 2012 13:39:30 GMT

Resistibility of telecommunication switching equipment to overvoltages and overcurrents

[ K.25 (11/88) ] - Lightning protection of optical fibre cables

jeu, 11 jan 2012 14:22:10 GMT

Lightning protection of optical fibre cables

[ K.25 (11/88) ] - Lightning protection of optical fibre cables

jeu, 11 jan 2012 14:22:10 GMT

Lightning protection of optical fibre cables

[ K.22 (11/88) ] - Overvoltage resistibility of equipment connected to an ISDN T/S bus

jeu, 11 jan 2012 14:20:59 GMT

Overvoltage resistibility of equipment connected to an ISDN T/S bus

[ K.22 (11/88) ] - Overvoltage resistibility of equipment connected to an ISDN T/S bus

jeu, 11 jan 2012 14:20:59 GMT

Overvoltage resistibility of equipment connected to an ISDN T/S bus

[ K.21 (11/88) ] - Resistibility of subscribers' terminals to overvoltages and overcurrents

jeu, 11 jan 2012 14:19:13 GMT

Resistibility of subscribers' terminals to overvoltages and overcurrents

[ K.21 (11/88) ] - Resistibility of subscribers' terminals to overvoltages and overcurrents

jeu, 11 jan 2012 14:19:12 GMT

Resistibility of subscribers' terminals to overvoltages and overcurrents

[ K.12 (11/88) ] - Characteristics of gas discharge tubes for the protection of telecommunications installations

jeu, 11 jan 2012 14:18:08 GMT

Characteristics of gas discharge tubes for the protection of telecommunications installations

[ K.12 (11/88) ] - Characteristics of gas discharge tubes for the protection of telecommunications installations

jeu, 11 jan 2012 14:18:08 GMT

Characteristics of gas discharge tubes for the protection of telecommunications installations

[ K.11 (11/88) ] - Principles of protection against overvoltages and overcurrents

jeu, 11 jan 2012 14:16:30 GMT

Principles of protection against overvoltages and overcurrents

[ K.11 (11/88) ] - Principles of protection against overvoltages and overcurrents

jeu, 11 jan 2012 14:16:30 GMT

Principles of protection against overvoltages and overcurrents

[ K.10 (11/88) ] - Unbalance about earth of telecommunication installations

jeu, 11 jan 2012 14:15:13 GMT

Unbalance about earth of telecommunication installations

[ K.10 (11/88) ] - Unbalance about earth of telecommunication installations

jeu, 11 jan 2012 14:15:12 GMT

Unbalance about earth of telecommunication installations

[ K.83 (03/11) ] - Monitoring of electromagnetic field levels

mer, 20 d�c 2011 15:45:01 GMT

The edition posted on 25 July 2011 did not reflect the correct title. That edition was removed and a corrected edition was posted on 20 December 2011.

Summary

Recommendation ITU-T K.83 gives guidance on how to make long-term measurements for the monitoring of electromagnetic fields (EMF) in the selected areas that are under public concern, in order to show that EMFs are under control and under the limits. The purpose of this Recommendation is to provide for the general public clear and easily available data concerning electromagnetic field levels in the form of results of continuous measurement.

[ K.83 (03/11) ] - Monitoring of electromagnetic field levels

mer, 20 d�c 2011 15:45:01 GMT

The edition posted on 25 July 2011 did not reflect the correct title. That edition was removed and a corrected edition was posted on 20 December 2011.

Summary

[ K.20 (11/11) ] - Resistibility of telecommunication equipment installed in a telecommunications centre to overvoltages and overcurrents

sam, 25 nov 2011 15:32:46 GMT

Summary

Recommendation ITU-T K.20 specifies resistibility requirements and test procedures for telecommunication equipment that is installed in a telecommunication centre.

Overvoltages or overcurrents covered by this Recommendation include surges due to lightning on or near the line plant, short‑term induction from adjacent a.c. power lines or railway systems, earth potential rise due to power faults, direct contacts between telecommunication lines and power lines and electrostatic discharges. The sources for overvoltages in internal lines, between equipment/racks, are mainly inductive coupling caused by lightning currents being conducted in nearby lightning strokes or lightning currents being conducted in nearby conductors.

Major changes compared with the 2008 version of this Recommendation include:

.�� updating the references;

.�� information on what USB ports should be tested;

.�� information on when to add protection to untested ports;

.�� adding test requirements for external coaxial cable ports;

.�� adding test requirements for multiple conductor internal unshielded cable ports.

[ K.20 (11/11) ] - Resistibility of telecommunication equipment installed in a telecommunications centre to overvoltages and overcurrents

sam, 25 nov 2011 15:32:46 GMT

Summary

Recommendation ITU-T K.20 specifies resistibility requirements and test procedures for telecommunication equipment that is installed in a telecommunication centre.

Major changes compared with the 2008 version of this Recommendation include:

.�� updating the references;

.�� information on what USB ports should be tested;

.�� information on when to add protection to untested ports;

.�� adding test requirements for external coaxial cable ports;

.�� adding test requirements for multiple conductor internal unshielded cable ports.

[ K.87 (11/11) ] - Guide for the application of electromagnetic security requirements - Basic Recommendation

sam, 25 nov 2011 15:30:57 GMT

Summary

General guidelines of information security management for telecommunications organizations are presented in ITU-T Recommendation X.1051, which is based on ISO/IEC Standards 27001 and 27002. In an information security management system (ISMS) based on Recommendation X.1051, physical security is a key issue, as shown for example in the following text presented in Recommendation X.1051:

"A site whose environment is least susceptible to damage from strong electromagnetic field shall be selected for communication centers. If necessary, less than satisfactory site may be selected provided appropriate measures are taken to protect telecommunications equipment rooms with electromagnetic shields, etc."

"controls should be adopted to minimize the risk of potential physical threats, e.g. theft, fire, explosives, smoke, water (or water supply failure), dust, vibration, chemical effects, electrical supply interference, communications interference, electromagnetic radiation, and vandalism;"

When the security is managed considering above mentioned sentences, we should evaluate the threat and mitigate equipment or site. The threat is related to "Vulnerability" and "Confidentiality" in ISMS.

This basic Recommendation outlines electromagnetic security risks of telecommunication equipments and guides how to assess and prevent those risks, in order to manage ISMS in accordance with Recommendation X.1051. Major electromagnetic security risks taken up in this Recommendation are as follows:

Natural EM threats (e.g. lightning);
Unintentional interference (i.e. Electromagnetic Interference (EMI));
Intentional interference(i.e. Intentional Electromagnetic Interference (IEMI));
Deliberate EM attack via High Altitude Electromagnetic Pulse (HEMP);
Deliberate EM attack via High Power Electromagnetic (HPEM);
Information leakage from EM emanation (i.e. Electromagnetic security (EMSEC));

[ K.87 (11/11) ] - Guide for the application of electromagnetic security requirements - Basic Recommendation

sam, 25 nov 2011 15:30:57 GMT

Summary

Natural EM threats (e.g. lightning);
Unintentional interference (i.e. Electromagnetic Interference (EMI));
Intentional interference(i.e. Intentional Electromagnetic Interference (IEMI));
Deliberate EM attack via High Altitude Electromagnetic Pulse (HEMP);
Deliberate EM attack via High Power Electromagnetic (HPEM);
Information leakage from EM emanation (i.e. Electromagnetic security (EMSEC));

[ K.45 (11/11) ] - Resistibility of telecommunication equipment installed in the access and trunk networks to overvoltages and overcurrents

sam, 25 nov 2011 15:29:52 GMT

Summary

Recommendation ITU-T K.45 specifies resistibility requirements and test procedures for telecommunication equipment installed between telecommunication centres and between a telecommunication centre and customer's premises building.

Major changes compared with the 2008 version of this Recommendation include:

.�� updating the references;

.�� information on when to add protection to untested ports;

.�� adding test requirements for external coaxial cable ports;

[ K.45 (11/11) ] - Resistibility of telecommunication equipment installed in the access and trunk networks to overvoltages and overcurrents

sam, 25 nov 2011 15:29:52 GMT

Summary

Major changes compared with the 2008 version of this Recommendation include:

.�� updating the references;

.�� information on when to add protection to untested ports;

.�� adding test requirements for external coaxial cable ports;

[ K.85 (11/11) ] - Requirements for the mitigation of lightning effects on home networks installed in customer premises

sam, 25 nov 2011 15:28:44 GMT

Summary

This recommendation gives the requirements for Home Network equipment and installations in customer premises. It covers the classification of interfaces, resistibility of equipment, impact of installation practices, installation of SPDs and a risk assessment of equipment damage according to [IEC 62305-2]. The risk assessment of user injury will be covered by a separate recommendation.

[ K.85 (11/11) ] - Requirements for the mitigation of lightning effects on home networks installed in customer premises

sam, 25 nov 2011 15:28:44 GMT

Summary

[ K.88 (11/11) ] - EMC requirements for Next Generation Network equipment

sam, 25 nov 2011 15:27:33 GMT

Summary

This Recommendation specifies the emission and immunity requirements for next generation network equipment, based on IP packet technologies. It also describes operational conditions for emission and immunity testing. Performance criteria for immunity tests are also specified.

[ K.88 (11/11) ] - EMC requirements for Next Generation Network equipment

sam, 25 nov 2011 15:27:33 GMT

Summary

[ K.21 (11/11) ] - Resistibility of telecommunication equipment installed in customer premises to overvoltages and overcurrents

sam, 25 nov 2011 15:26:26 GMT

Summary

Recommendation ITU-T K.21 specifies resistibility requirements and test procedures for telecommunication equipment that is installed in or on a customer premises building.

Overvoltages or overcurrents covered by this Recommendation include surges due to lightning on or near the line plant, short-term induction from adjacent a.c. power lines or railway systems, earth potential rise due to power faults, direct contacts between telecommunication lines and power lines and electrostatic discharges. The sources for overvoltages in internal lines are mainly inductive coupling caused by lightning currents being conducted in nearby lightning strokes or lightning currents being conducted in nearby conductors.

Major changes compared with the 2008 version of this Recommendation include:

.�� updating the references;

.�� information on what USB ports should be tested;

.�� information on when to add protection to untested ports;

.�� adding test requirements for external coaxial cable ports;

.�� adding test requirements for multiple conductor internal unshielded cable ports.

[ K.21 (11/11) ] - Resistibility of telecommunication equipment installed in customer premises to overvoltages and overcurrents

sam, 25 nov 2011 15:26:26 GMT

Summary

Recommendation ITU-T K.21 specifies resistibility requirements and test procedures for telecommunication equipment that is installed in or on a customer premises building.

Major changes compared with the 2008 version of this Recommendation include:

.�� updating the references;

.�� information on what USB ports should be tested;

.�� information on when to add protection to untested ports;

.�� adding test requirements for external coaxial cable ports;

.�� adding test requirements for multiple conductor internal unshielded cable ports.

[ K.44 (11/11) ] - Resistibility tests for telecommunication equipment exposed to overvoltages and overcurrents - Basic Recommendation

sam, 25 nov 2011 15:25:18 GMT

Summary

Recommendation ITU-T K.44 seeks to establish fundamental test methods and criteria for the resistibility of telecommunication equipment to overvoltages and overcurrents.

Overvoltages or overcurrents covered by this Recommendation include surges due to lightning on or near the line plant, short-term induction of alternating voltages from adjacent electric power lines or electrified railway systems, earth potential rise due to power faults, and direct contacts between telecommunication lines and power lines.

Major changes compared with the 2008 version of this Recommendation include:

-�� updating the references;

.�� amended Criterion A;

.�� revision of the test schematics to improve clarity;

.�� adding test schematics for external coaxial cable ports;

.�� adding multi conductor test schematics for internal unshielded cables;

.�� adding tolerances for waveform generation.

.�� addition of ports that rely on insulation coordination for surge protection.

[ K.44 (11/11) ] - Resistibility tests for telecommunication equipment exposed to overvoltages and overcurrents - Basic Recommendation

sam, 25 nov 2011 15:25:18 GMT

Summary

Recommendation ITU-T K.44 seeks to establish fundamental test methods and criteria for the resistibility of telecommunication equipment to overvoltages and overcurrents.

Major changes compared with the 2008 version of this Recommendation include:

-�� updating the references;

.�� amended Criterion A;

.�� revision of the test schematics to improve clarity;

.�� adding test schematics for external coaxial cable ports;

.�� adding multi conductor test schematics for internal unshielded cables;

.�� adding tolerances for waveform generation.

.�� addition of ports that rely on insulation coordination for surge protection.

[ K.86 (11/11) ] - Method for measuring Longitudinal Conversion Loss (9kHz - 30MHz)

sam, 25 nov 2011 15:21:21 GMT

Summary

With the liberalization in telecommunications, unbundling becomes common-place in telecommunications networks. The unbundling of the access network increases the number of operators that may provide services within a common access network cable. In this context, unbalance is not only related to the transmission performance of the services, but also strongly related to EMC performance of the services. The LCL of telecommunication lines or telecommunication ports is a measure of the degree of unwanted transverse signal produced at the terminals of the network due to the presence of a longitudinal signal on the connecting leads.

Considering the frequency range of broadband services such as ISDN, ADSL, ADSL2, ADSL2plus, VDSL and VDSL2, this Recommendation presents the method for measuring Longitudinal Conversion Loss for the frequency range from 9kHz to 30MHz and presents the suggestion of the admissible value for the unbundling condition.

[ K.86 (11/11) ] - Method for measuring Longitudinal Conversion Loss (9kHz - 30MHz)

sam, 25 nov 2011 15:21:21 GMT

Summary

[ K.70 (2007) Amendment 2 (05/11) ] - Appendix I - New version v.2.0.0 of the software EMF estimator

sam, 22 jui 2011 13:16:11 GMT

Appendix I - New version v.2.0.0 of the software EMF estimator

[ K.77 (2009) Corrigendum 1 (05/11) ]

ven, 14 jui 2011 10:27:11 GMT

Summary

Corrigendum 1 to Recommendation ITU-T K.77 corrects reference defects given in Recommendation ITU-T K.77 (2009). One reference has been withdrawn and merged with another reference. The reference and its associated text reference are changed. Other references are removed as they are not stated in the body of this Recommendation. Six references have been revised and their references are updated.

[ K.77 (2009) Corrigendum 1 (05/11) ]

ven, 14 jui 2011 10:27:11 GMT

Summary

[ K.72 (06/11) ] - Protection of telecommunication lines using metallic conductors against lightning - Risk management

sam, 17 jui 2011 14:39:08 GMT

Summary

Recommendation ITU-T K.72 gives the methodology for evaluating the need for protection measures against lightning of telecommunication lines using metallic conductors.

This method is based on the risk assessment: protection measures are necessary when the risk is greater than the tolerable risk. Maximum value of the tolerable risks is suggested.

This Recommendation considers the risk of loss of service of the telecommunication network.

The risk is evaluated through the risk components caused by lightning, which is the source of damage on telecommunication line as a function of the striking point with respect to the telecommunication line (lightning flashes direct to the line, near the line, or directly to the structures connected at the ends of the line).

This Recommendation shall be used together with Recommendation ITU-T K.47, which provides the risk assessment and the protection measures against lightning flashes direct to the telecommunication line and connected structures, and Recommendation ITU-T K.46, which provides the risk assessment and the protection measures against lightning flashes near the telecommunication line.

[ K.72 (06/11) ] - Protection of telecommunication lines using metallic conductors against lightning - Risk management

sam, 17 jui 2011 14:39:08 GMT

Summary

Recommendation ITU-T K.72 gives the methodology for evaluating the need for protection measures against lightning of telecommunication lines using metallic conductors.

This method is based on the risk assessment: protection measures are necessary when the risk is greater than the tolerable risk. Maximum value of the tolerable risks is suggested.

This Recommendation considers the risk of loss of service of the telecommunication network.

[ K.71 (06/11) ] - Protection of customer antenna installations

sam, 17 jui 2011 14:37:41 GMT

Summary

ITU-T Recommendation K.71 provides information to network operators on when antennas may be installed in, or on, a customer building without performing a building-specific risk assessment.

When a risk assessment is required, the Recommendation provides guidance on the application of IEC 62305-2. It also provides information on the responsibilities of the network operator and the building owner.

This revised version of Recommendation K.71 has updated references and added definitions from IEC 60364-5-54 to minimise confusion regarding protective conductors. The section on protecting against contacts between the antenna and feeder cable has been amended. Appendix II has been checked to ensure the generic risk assessments are in line with IEC 62305-2 ed. 2

[ K.71 (06/11) ] - Protection of customer antenna installations

sam, 17 jui 2011 14:37:41 GMT

Summary

ITU-T Recommendation K.71 provides information to network operators on when antennas may be installed in, or on, a customer building without performing a building-specific risk assessment.

[ K.66 (06/11) ] - Protection of customer premises from overvoltages

sam, 17 jui 2011 14:31:05 GMT

Summary

This Recommendation:

.�� provides recommendations for bonding and earthing of telecommunication equipment in residential and commercial customer premises;

.�� refers to [ITU-T K.21] for equipment resistibility requirements;

.�� recommends earthing and bonding requirements to coordinate with the resistibility requirements of [ITU-T K.21] and the safety requirements of [IEC 60950-1] and [IEC 62368].;

.�� recommends the installation practices for bonding of all services and the installation of SPDs;

.�� illustrates problems associated with earthing and bonding and provides solutions for these earthing and bonding problems. These include:

1)�� methods to improve the earthing and bonding;

2)�� methods of providing additional protection external to the equipment;

3)�� special resistibility and safety requirements;

.�� recommends responsibilities for protection at customer premises;

.�� refers to [IEC 62305-3] for protection against direct lightning.

This revision of K.66 includes an update of the references and a revision of section 6.3 to include more information on preventing equipment damage. Appendix IV, containing information on Special resistibility requirements has been deleted. The reader is directed to [ITU-T K.44].

[ K.66 (06/11) ] - Protection of customer premises from overvoltages

sam, 17 jui 2011 14:31:05 GMT

Summary

This Recommendation:

.�� provides recommendations for bonding and earthing of telecommunication equipment in residential and commercial customer premises;

.�� refers to [ITU-T K.21] for equipment resistibility requirements;

.�� recommends earthing and bonding requirements to coordinate with the resistibility requirements of [ITU-T K.21] and the safety requirements of [IEC 60950-1] and [IEC 62368].;

.�� recommends the installation practices for bonding of all services and the installation of SPDs;

.�� illustrates problems associated with earthing and bonding and provides solutions for these earthing and bonding problems. These include:

1)�� methods to improve the earthing and bonding;

2)�� methods of providing additional protection external to the equipment;

3)�� special resistibility and safety requirements;

.�� recommends responsibilities for protection at customer premises;

.�� refers to [IEC 62305-3] for protection against direct lightning.

[ K.65 (01/11) ] - Overvoltage and overcurrent requirements for termination modules with contacts for test ports or surge protective devices

ven, 05 mai 2011 09:41:33 GMT

Summary

Recommendation ITU-T K.65 specifies the overvoltage requirements and test procedures for termination modules, with contacts for test ports or surge protective devices (SPDs), used for symmetric pair conductors subjected to overvoltages and overcurrents.

Overvoltages or overcurrents covered by this Recommendation include surges due to lightning on or near the line plant, short-term induction of alternating voltages from adjacent power lines or railway systems, earth potential rise due to power faults, and direct contacts between telecommunication lines and power lines.

Major changes compared with the 2004 version of this Recommendation include:

-�� the addition of a mains contact test to the equipment side of a module with series elements;

-�� a reduction of the current magnitude for test Figure C.2 and for the customer side test for test Figure C.3 (tests 2.2 and 2.3);

-�� a revision of Figure E.1 - 10/350 �s current generator to be in line with Recommendation ITU-T K.44, Figure II.4-1 - 10/350 μs current surge generator;

-�� the addition of information on the use of fail-safes;

-�� the addition of a coordination test, for modules with series elements, to check that surges under the firing voltage of the gas discharge tube (GDT) will not damage the series elements;

-�� the addition of a high voltage a.c. test to simulate a voltage > 230 V a.c. which will operate a 600 V GDT.

[ K.65 (01/11) ] - Overvoltage and overcurrent requirements for termination modules with contacts for test ports or surge protective devices

ven, 05 mai 2011 09:41:33 GMT

Summary

Overvoltages or overcurrents covered by this Recommendation include surges due to lightning on or near the line plant, short-term induction of alternating voltages from adjacent power lines or railway systems, earth potential rise due to power faults, and direct contacts between telecommunication lines and power lines.

Major changes compared with the 2004 version of this Recommendation include:

-�� the addition of a mains contact test to the equipment side of a module with series elements;

-�� a reduction of the current magnitude for test Figure C.2 and for the customer side test for test Figure C.3 (tests 2.2 and 2.3);

-�� a revision of Figure E.1 - 10/350 �s current generator to be in line with Recommendation ITU-T K.44, Figure II.4-1 - 10/350 μs current surge generator;

-�� the addition of information on the use of fail-safes;

-�� the addition of a coordination test, for modules with series elements, to check that surges under the firing voltage of the gas discharge tube (GDT) will not damage the series elements;

-�� the addition of a high voltage a.c. test to simulate a voltage > 230 V a.c. which will operate a 600 V GDT.

[ K.64 (01/11) ] - Safe working practices for outside equipment installed in particular environments

ven, 05 mai 2011 09:34:15 GMT

Summary

Recommendation ITU-T K.64 describes working practices for service personnel to help them work safely in telecommunication installations in three specific environments.

The specific environments covered in this Recommendation are characterized by wet conditions or close proximity to exposed metallic parts. �

The working practices apply to telecommunication plants with voltage levels higher than the limits defined for analogue PSTN circuits, such as remote feeding telecommunication current or voltage (RFT-C or RFT-V) circuits.

This version of Recommendation ITU-T K.64 includes a warning regarding contact with terminals carrying RFT circuits with small parts of the body, e.g., back of the hand. The references have been updated.

[ K.64 (01/11) ] - Safe working practices for outside equipment installed in particular environments

ven, 05 mai 2011 09:34:15 GMT

Summary

Recommendation ITU-T K.64 describes working practices for service personnel to help them work safely in telecommunication installations in three specific environments.

The specific environments covered in this Recommendation are characterized by wet conditions or close proximity to exposed metallic parts. �

[ K.84 (01/11) ] - Test methods and guide against information leaks through unintentional electromagnetic emissions

sam, 21 jan 2011 10:06:41 GMT

Summary

In an information security management system (ISMS), based on Recommendation
ITU-T X.1051 and ISO/IEC Standards 27001 and 27002, physical security is a key issue.

When security is managed taking the above references into consideration, we should evaluate the threats and mitigate their impact against equipment or sites. Threats are related to confidentiality in ISMS.

This recommendation describes threats from information leakage due to unintentional electromagnetic emanations, and the two approaches of mitigation i.e reduction of emission from equipment and the level of site shielding are described. Information leakage test methods for conducted and radiated emission are presented.

[ K.84 (01/11) ] - Test methods and guide against information leaks through unintentional electromagnetic emissions

sam, 21 jan 2011 10:06:40 GMT

Summary

In an information security management system (ISMS), based on Recommendation
ITU-T X.1051 and ISO/IEC Standards 27001 and 27002, physical security is a key issue.

[ K.82 (05/10) ] - Characteristics and ratings of solid-state, self-restoring overcurrent protectors for the protection of telecommunications installations

mar, 29 nov 2010 10:15:48 GMT

Summary

Recommendation ITU-T K.82 defines the basic requirements and parameters of solid-state, self-restoring overcurrent protectors (OCPs) for the protection of telecommunication installations (for example, exchange equipment, access equipment, telecommunication lines and subscriber or customer equipment).

This Recommendation should be used for the harmonization of existing or future specifications issued by solid-state, self-restoring overcurrent protector manufacturers, telecommunication equipment manufacturers, administrations or network operators.

[ K.82 (05/10) ] - Characteristics and ratings of solid-state, self-restoring overcurrent protectors for the protection of telecommunications installations

mar, 29 nov 2010 10:15:48 GMT

Summary

[ K.12 (05/10) ] - Characteristics of gas discharge tubes for the protection of telecommunications installations

ven, 11 nov 2010 15:02:41 GMT

Summary

Recommendation ITU-T K.12 defines the basic characteristics to be met by gas discharge tubes for the protection of exchange and outdoor equipment, subscriber or customer equipment and telecommunication lines from surges. It is intended to be used for the harmonization of existing or future specifications issued by gas discharge tube manufacturers, telecommunication equipment manufacturers, administrations or network operators.