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Security in Telecommunications and Information Technology

Thu, 06 Jul 2017 11:32:47 GMT

Security in Telecommunications and Information Technology



Quality of service and network performance

Thu, 21 Jun 2012 13:48:37 GMT

Quality of service and network performance
The QoS Handbook sets out to specify network service quality parameters that enable services to be offered to customers/users in order to satisfy customers'/users' quality of service expectations. These parameters relate to both implementation and ongoing use of the service. Service quality is also related to all aspects of network assessment and management of the network.



Security in Telecommunications and Information Technology

Mon, 15 May 2017 09:15:16 GMT

Security in Telecommunications and Information Technology
The purpose of the ITU-T Manual on Security in Telecommunications and Information Technology is to provide a broad introduction to the security work of ITU-T. It is directed towards those who have responsibility for, or an interest in, information and communications security and the related standards, and those who simply need to gain a better understanding of ICT security issues and the corresponding ITU-T Recommendations.
Please note that the latest version is available for free in PDF http://www.itu.int/pub/T-TUT-SEC-2015



Future networks

Wed, 13 Jun 2012 11:52:12 GMT

Future networks
This ITU-T Handbook reviews the work to date on future networks. The development of future networks is driven by, on the one hand, the perceived challenges that are faced by networks at the moment and, on the other hand, by the continual development of new applications and technology. The work on future networks is broad in scope and covers not only technological issues but also social, economic and environmental aspects.



Testing of next generation networks

Wed, 24 Aug 2011 15:44:00 GMT

Testing of next generation networks
This Handbook describes the general approach to testing of next generation networks (NGNs). Its goal is to assist administrations and operators in the implementation of testing as a method to verify network and services development strategies, but it can be used by vendors as well. It also discusses interoperability problems that could appear during network or service implementation.



Object identifiers (OIDs) and their registration authorities

Thu, 23 Jun 2011 16:37:30 GMT

Object identifiers (OIDs) and their registration authorities
This Handbook provides information on the use of Object Identifiers (OIDs). It consists of several parts, which will be of interest to different audiences. Part 1 is a general introduction. Part 2 contains historical and background information of a largely tutorial nature. Part 3 provides a full description of the structure of the International OID tree, the high-level arcs and major branches, and the notations and encodings used for expressing OID values. Part 4 is concerned with the practical use of OIDs. It introduces the OID repository and the ITU-T module database. It describes some of the early and current uses of OIDs. Part 5 covers more recent developments, including the International Object Identifier tree, Unicode labels and long arcs. Part 6 discusses the OID Resolution System (ORS) using the Domain Name System (DNS). Part 7 contains instructions on how to obtain an OID for various purposes, and how to manage a sub-authority for allocation of a node to children, including information on actions needed to make use of the ORS.
There are several Annexes (of which the most important are probably those concerned with the setting up and operation of a national registration authority) and a bibliography.



Practical procedures for subjective testing

Fri, 24 Jun 2011 08:40:39 GMT

Practical procedures for subjective testing
This Handbook describes practical procedures to be used to quantify the perceived audio quality of end-to-end speech and audio communication systems.



Optical Transport Networks from TDM to Packet

Thu, 10 Mar 2011 17:15:05 GMT

Optical Transport Networks from TDM to Packet
This Handbook discusses the technologies covered by ITU-T Recommendations related to Synchronous Digital Hierarchy (SDH), Optical Transport Network (OTN) and Ethernet over Transport (EoT). Each chapter of this Handbook is dedicated to a specific aspect (architecture, multiplexing hierarchy, protection, synchronization, etc.) of SDH, OTN and EoT optical transport networks. Plesiochronous Digital Hierarchy networks, which are at present considered obsolete, and Multiprotocol Label Switching - Transport Profile, which is at a preliminary stage of standardization, are only mentioned in the Preface. Finally, the last chapter of the Handbook discusses automatically switched optical networks (ASON), based on the control planes introduced in addition to transport planes and management planes.



DSL story

Mon, 11 Oct 2010 13:39:04 GMT

DSL story
This Handbook provides an overview of the 18 ITU-T Recommendations dealing with the xDSL technology published as of the end of 2009. After a brief introduction of the xDSL technology, the xDSL Recommendations are grouped into nine categories: HDSL and SHDSL, five ADSL (G.992.2, splitterless ADSL, ADSL2 reach extended, splitterless ADSL2 and ADSL2plus) and two VDSL (VDSL1 and VDSL2). Operations and signalling principles of these nine families of xDSL systems are presented, emphasizing the commonalities.



Converging networks

Thu, 07 Oct 2010 15:17:01 GMT

Converging networks
This Handbook presents the ITU-T Recommendations on next generation networks in the context of the ongoing convergence of the telecommunications and media industries.



Optical fibres, cables and systems

Wed, 24 Feb 2010 14:23:07 GMT

Optical fibres, cables and systems
(This Handbook was superseded by the 2015 edition of Technical Report on Optical fibres, cables and systems).

The Handbook is intended as a guide for technologists, middle-level management, as well as regulators, to assist in the practical installation of optical fibre-based systems. Throughout the discussions on the practical issues associated with the application of this technology, the explanations focus on how ITU T Recommendations address them. It provides the organized insights of those who have created and lived with the evolution of the technology for several decades.
Note: The soft-copy of this publication is downloadable free of charge on an exceptional basis, while hard-copy may eventually be purchased.



Preservation of Wooden Poles Carrying Overhead Telecommunication Lines

Wed, 21 Apr 2010 14:19:56 GMT

Preservation of Wooden Poles Carrying Overhead Telecommunication Lines
Since the problems of preserving wood against biological agents depend on the region, they have to be studied mainly in a regional context by joint groups of technicians, producers and users of poles.



Mitigation measures for telecommunication installations - Part 1

Thu, 16 Sep 2010 09:19:52 GMT

Mitigation measures for telecommunication installations - Part 1
This Handbook describes case studies, supplied by ITU-T Study Group 5 members, of electromagnetic compatibility (EMC) interference problems that have affected telecommunication systems related to emission and immunity, overvoltage and overcurrent, and the solutions to such problems. This handbook also indicates typical sources of interference as well as the solutions that can be used to restore correct service to the system or to avoid any such problems before they manifest themselves.
Whilst this handbook does not cover measurement methods or how to measure emissions, overvoltage or overcurrent, as these are covered within other ITU-T Recommendations, it does, through the case studies, suggest how to detect certain problems.

The electronic version of part 2 is free of charge.

www.itu.int/ITU-T/mitigation/mitigation-p2.html



Deployment of packet-based networks

Fri, 18 Jun 2010 15:19:43 GMT

Deployment of packet-based networks
This Handbook presents guidelines for operators planning migration of PSTN/ISDN services to packet-based networks in the evolution to next-generation networks.



Security in Telecommunications and Information Technology

Mon, 15 May 2017 09:11:59 GMT

Security in Telecommunications and Information Technology



Directives concerning the protection of telecommunication lines against harmful effects from electric power and electrified railway lines - Volume VI: Danger, damage and disturbance

Mon, 02 Jun 2008 18:57:59 GMT

Directives concerning the protection of telecommunication lines against harmful effects from electric power and electrified railway lines - Volume VI: Danger, damage and disturbance
"These Directives describe the danger to telecommunication system workers and users and damage to equipment as well as the interference to transmission of information that may occur as a result of the proximity of telecommunication system installations to electric power and electrified railway installations. It also describes the conditions that may result in danger to telecommunication system workers and users or damage to equipment. It must be emphasized that although the possibility of danger may exist, the probability of damage to equipment is small and the likelihood of injury is very remote. In addition, it states the conditions that may result in interference to the transmission of information because of the influence of electrical power and electrified railway installations. The likelihood of transmission degradation is significantly increased by such factors as exposure length, earth return currents, harmonic content of power current, cable shielding and longitudinal balance. "



Directives concerning the protection of telecommunication lines against harmful effects from electric power and electrified railway lines - Volume V: Inducing currents and voltages in power transmission and distribution systems

Mon, 02 Jun 2008 18:56:48 GMT

Directives concerning the protection of telecommunication lines against harmful effects from electric power and electrified railway lines - Volume V: Inducing currents and voltages in power transmission and distribution systems
The Directives provide a comprehensive description of electromagnetic effects due to the close proximity of telecommunication lines to power and electrified railway systems. Such effects may result in danger to personnel, damage to telecommunication equipment, deterioration of telecommunication transmission quality or disturbance of signalling.
Volume V: "Inducing currents and voltages in power transmission and distribution systems" describes balanced and unbalanced power systems in normal operation and under fault conditions.



Deployment of IMT-2000 Systems

Thu, 16 Mar 2006 10:22:01 GMT

Deployment of IMT-2000 Systems
This handbook addresses a variety of issues related to the deployment of IMT-2000 systems, to inform and guide key decision-makers on critical aspects concerning third-generation mobile communication systems, to facilitate decisions on the selection of options and strategies for the introduction of their IMT-2000 networks.



Security in Telecommunications and Information Technology

Fri, 25 Aug 2006 16:18:10 GMT

Security in Telecommunications and Information Technology



Security in Telecommunications and Information Technology

Thu, 12 Jan 2006 08:56:19 GMT

Security in Telecommunications and Information Technology



Security in Telecommunications and Information Technology

Thu, 12 Jan 2006 08:55:55 GMT

Security in Telecommunications and Information Technology
superseded



Outside Plant Technologies for Public Networks

Wed, 01 Jan 1992 00:00:00 GMT

Outside Plant Technologies for Public Networks
This Handbook gives an insight into the construction and usage of telecommunication cables. Telecommunication cables represent a large investment and provide a vital link in transmitting information. Accordingly, they must be designed to provide a consistent, reliable electrical path while resisting mechanical and environmental conditions imposed during their installation and service life. Good quality materials need to be selected and arranged to meet local conditions and cost objectives.



Addition to Section 3 of the Handbook on Telephonometry

Mon, 01 Jan 2001 00:00:00 GMT

Addition to Section 3 of the Handbook on Telephonometry
The Handbook on Telephonometry is intended to be a practical manual and serves as a guide to sound engineering practice. The present additions bring new complementary information to the previous edition of the Handbook (1992).



Addition to Section 2.3 of the Handbook on Telephonometry

Thu, 05 Oct 2006 15:01:11 GMT

Addition to Section 2.3 of the Handbook on Telephonometry
The Handbook on Telephonometry is intended to be a practical manual and serves as a guide to sound engineering practice. The present additions bring new complementary information to the previous edition of the Handbook (1992).



Additions to the Handbook on Telephonometry

Fri, 01 Jan 1999 00:00:00 GMT

Additions to the Handbook on Telephonometry
The Handbook on Telephonometry is intended to be a practical manual and serves as a guide to sound engineering practice. The present additions bring new complementary information to the previous edition of the Handbook (1992).



CHILL Formal Definition - Volume I, Parts 1, 2, 3

Fri, 01 Jan 1982 00:00:00 GMT

CHILL Formal Definition - Volume I, Parts 1, 2, 3



CHILL Formal Definition - Volume II, Part 4

Fri, 01 Jan 1982 00:00:00 GMT

CHILL Formal Definition - Volume II, Part 4



The Protection of Telecommunication Lines and Equipment Against Lightning Discharges - Chapters 9 and 10

Sat, 01 Jan 1994 00:00:00 GMT

The Protection of Telecommunication Lines and Equipment Against Lightning Discharges - Chapters 9 and 10
The Handbook "The protection of telecommunication lines and equipment against lightning discharges" was originally published in 1974, followed by the publication of additional Chapters 6, 7 and 8 in 1978. The ITU-T Study Group 5 has now prepared further new Chapters 9 and 10: Chapter 9 on fibre optic cable lightning damage assessment and Chapter 10 on overvoltages and overcurrents measured on telecommunication subscriber lines.



The Protection of Telecommunication Lines and Equipment Against Lightning Discharges - Chapters 6, 7 and 8

Sun, 01 Jan 1978 00:00:00 GMT

The Protection of Telecommunication Lines and Equipment Against Lightning Discharges - Chapters 6, 7 and 8
"The purpose of this Handbook is to reach a balance between the cost of protecting lines and plant from lightning damage and the cost of repair and the tolerable number of faults, in a given area. These costs will depend on the number of thunderstorm days per year (keraunic level), soil resistivity and the degree of shielding provided by buildings, water pipes, and metallic structures in general. A classification of zones according to the risk of lightning strikes appears to be useful. It is not possible, however, to make a universally valid classification solely in terms of the number of thunderstorm days per year, because the effect of lightning on telecommunication cables (which is the real criterion) differs according to the other factors involved, including the local earth resistivity and the topographical situation. A relatively low keraunic level may therefore give rise to a low fault rate in one region but to a high fault rate in another. Each country must make its own local observations to determine the relation between the keraunic level in their areas and the fault liability, and to classify their zones accordingly. "



The Protection of Telecommunication Lines and Equipment Against Lightning Discharges - Chapters 1 to 5

Tue, 01 Jan 1974 00:00:00 GMT

The Protection of Telecommunication Lines and Equipment Against Lightning Discharges - Chapters 1 to 5
This Handbook contains a general survey of atmospheric discharge phenomena and of the protection devices in use. It gives the explanations in the appendices to the various chapters are necessary for an understanding of the phenomena as well as for calculating the design of protection devices. For a wider study of theory and physical phenomena, reference should be made to the numerous specialized publications. It seems best to limit the field of application of this Handbook to telecommunication lines and associated equipment. The latter also include cable and overhead lines which lead to transmitting installations, radio relay stations, etc. at high altitude, which are thus more than normally exposed. The present Handbook does not deal with the protection of the stations themselves, since such problems concern the protection of buildings against lightning and this, for transmitting stations and radio relay stations, falls within the domain of radio technique. The protection of the buildings in which the telecommunication equipment is installed is governed by the national regulations on lightning protection.



Volume IX: Testing methods and measuring apparatus

Mon, 01 Jan 1990 00:00:00 GMT

Volume IX: Testing methods and measuring apparatus
This report concerns the testing methods and measuring apparatus" describes the methods and apparatus used to determine parameters required for coupling calculations, and to verify the satisfactory operation of protective measures. In addition it deals with testing methods taking into account modern practices in other fields of electromagnetic compatibility (e.g. lightning, high frequency disturbances).



Volume VIII: Protective devices

Mon, 01 Jan 1990 00:00:00 GMT

Volume VIII: Protective devices
This report highlights the protective devices" giving the latest information on devices which may be used to improve safety standards or reduce disturbance of telecommunication systems.



Volume VII: Protective measures and safety precautions

Mon, 01 Jan 1990 00:00:00 GMT

Volume VII: Protective measures and safety precautions
"This report concerns the protective measures and safety precautions" and describes methods which are commonly used to ensure satisfactory working and operating conditions. "



Volume VI: Danger and disturbance

Mon, 01 Jan 1990 00:00:00 GMT

Volume VI: Danger and disturbance
This report describes the danger to telecommunication system workers, users and equipment as well as the interference to transmission of information that may occur as a result of the proximity of telecommunication system installations to electric power and electrified railway installations.



Volume IV: Inducing currents and voltages in electrified railway systems

Mon, 01 Jan 1990 00:00:00 GMT

Volume IV: Inducing currents and voltages in electrified railway systems
This report consists of "inducing currents and voltages in electrified railway systems" describes traction systems using d.c. and a.c. at various frequencies (16 2/3 Hz, 50 Hz, 60 Hz, etc.) in normal operation and under fault conditions.



Volume III: Capacitive, inductive and conductive coupling: physical theory and calculation methods

Mon, 01 Jan 1990 00:00:00 GMT

Volume III: Capacitive, inductive and conductive coupling: physical theory and calculation methods
"This report concerns "capacitive, inductive and conductive coupling: physical theory and calculation methods" gives an account of the physical laws governing the relevant phenomena together with mathematical models, and introduces a precise calculation method to evaluate voltages and currents resulting from couplings.



Volume I: Design, construction and operational principles of telecommunication, power and electrified railway facilities

Mon, 01 Jan 1990 00:00:00 GMT

Volume I: Design, construction and operational principles of telecommunication, power and electrified railway facilities
This report concerns "the design, construction and operational principles of telecommunication, power and electrified railway facilities" describes these systems and shows why conditions for their mutual coexistence must be established.



Directives concerning the protection of telecommunication lines against harmful effects from electric power and electrified railway lines - Volume II: Calculating induced voltages and currents in practical cases

Mon, 01 Jan 1990 00:00:00 GMT

Directives concerning the protection of telecommunication lines against harmful effects from electric power and electrified railway lines - Volume II: Calculating induced voltages and currents in practical cases
The Directives provide a comprehensive description of electromagnetic effects due to the close proximity of telecommunication lines to power and electrified railway systems. Such effects may result in danger to personnel, damage to telecommunication equipment, deterioration of telecommunication transmission quality or to disturbance of signalling. Volume II - Calculating induced voltages and currents in practical cases - describes the methods for evaluating voltages and currents resulting from capacitive, inductive and conductive coupling in a variety of commonly-encountered situations.



Volume V: Inducing currents and voltages in power transmission and distribution systems

Fri, 01 Jan 1999 00:00:00 GMT

Volume V: Inducing currents and voltages in power transmission and distribution systems
The Directives provide a comprehensive description of electromagnetic effects due to the close proximity of telecommunication lines to power and electrified railway systems. Such effects may result in danger to personnel, damage to telecommunication equipment, deterioration of telecommunication transmission quality or to disturbance of signaling. Volume V - Inducing currents and voltages in power transmission and distribution systems - describes unbalanced and balanced power systems in normal operation and under fault conditions.



Protection of Telecommunication Buildings from Fire

Mon, 01 Jan 2001 00:00:00 GMT

Protection of Telecommunication Buildings from Fire
In a telephone building, the losses from damage caused by fire not only affect the persons and property directly involved in the calamity, but are felt throughout the population due to the effects of the service breakdown and the consequent loss of earnings from the service provider point of view. Moreover, the amount of information and services available to the customers is so high, nowadays, that equipment, buildings, infrastructures and installations need to be protected from damage due to calamities, including fire. This Handbook is specific to the prevention of damage and the protection of telecommunication buildings from fire.



Marinized Terrestrial Cables

Mon, 01 Jan 2001 00:00:00 GMT

Marinized Terrestrial Cables
The use of underwater optical cables, considered as coming under the heading of terrestrial links, has dramatically increased in recent years.
This Handbook describes the characteristics, including the installation methods and testing, of a particular type of underwater cable known as marinized terrestrial cable (MTC), which, based on a conventional multiple fibre terrestrial cable core, is protected to withstand the shallow water environment and designed for specific repeaterless applications.



Handbook on Transmission Planning

Fri, 01 Jan 1993 00:00:00 GMT

Handbook on Transmission Planning
Withdrawn



Jointing of Plastic-Sheathed Cables

Thu, 14 Jan 2010 14:19:04 GMT

Jointing of Plastic-Sheathed Cables
This handbook describes some of the methods for jointing plastic sheathed telecommunication cables (sheath closures) used at present by various telecommunication Administrations, private operating agencies and cable manufacturing companies. Enough information is given to enable Administrations to choose the type best suited to their own requirements from the different methods described, but further details concerning equipment, materials and methods used may be necessary before adopting any of the techniques. Some methods have been omitted because the method has been, or is being, superseded by improved methods that have undergone long-term trials.Trials have also been made with sheath closures for metal-sheated cables providedwith an outer plastic sheath and these have been included in the handbook, together with methods of jointing plastic and metal plastic sheaths to each other and to other types of cable sheaths.



Jointing of Telecommunication Cable Conductors

Fri, 01 Jan 1982 00:00:00 GMT

Jointing of Telecommunication Cable Conductors



Construction, Installation, Jointing and Protection of Optical Fibre Cables

Fri, 15 Sep 2006 09:50:38 GMT

Construction, Installation, Jointing and Protection of Optical Fibre Cables
This Handbook gives an insight into the construction, installation, jointing and protection of optical fibre cables. It focuses on internal and external cables, design factor as well as on cables for different environmental conditions.



Application of Computers and Microprocessors to the Construction, Installation and Protection of Telecommunication Cables

Fri, 01 Jan 1999 00:00:00 GMT

Application of Computers and Microprocessors to the Construction, Installation and Protection of Telecommunication Cables
The first edition of this Handbook was published in 1994. Due to the rapid development of technologies, a second edition was considered useful to include new applications for computers and microprocessors, taking into account that many countries are adopting such devices and equipment. Outside plant occupies a wide area which requires a large amount of investment and a huge amount of work on design, construction, installation and protection, especially considering the new telecommunication services now available and the future role of access networks.



Interference measuring techniques

Mon, 01 Jan 2001 00:00:00 GMT

Interference measuring techniques
This Handbook contains information on EMC design of telecommunications equipment and discusses certain EMC test methods. Together with «Volume IX» of the «Directives», this Handbook provides comprehensive information on EMC and overvoltage testing and measurements.



Instructions for the International Telephone Service

Fri, 01 Jan 1993 00:00:00 GMT

Instructions for the International Telephone Service
These instructions include Recommendation ITU-T E.141 which was withdrawn on 20 March 2003 by Circular 156.



Preservation of Wooden Poles Carrying Overhead Telecommunication Lines

Tue, 01 Jan 1974 00:00:00 GMT

Preservation of Wooden Poles Carrying Overhead Telecommunication Lines



Compendium of Cable Measurement Methods

Thu, 14 Jan 2010 16:12:02 GMT

Compendium of Cable Measurement Methods
"The CCITT found it necessary to produce a ""Cable Measurement Compendium"" in order to facilitate work in the CCITT itself and relations between Administrations and manufacturers. Work on the Compendium started during the study period 1976-1980 and was completed with large-scale international collaboration during the study period 1981-1984. It was decided to include only methods for measuring transmission parameters and to identify the main bibliographical sources at the end of each chapter (there being one chapter for each parameter), to enable users of the Compendium to research each subject in greater detail as required. The Compendium as it stands should prove most useful to Administrations and manufacturers and become the reference work in this particular field. "


(Hard copies in English, French, Spanish are out of print).



Handbook on Telephonometry

Fri, 01 Jan 1993 00:00:00 GMT

Handbook on Telephonometry



ISDN Field Trial Guidelines

Tue, 01 Jan 1991 00:00:00 GMT

ISDN Field Trial Guidelines
"This document on ISDN field trial guidelines has been prepared specifically to provide help and guidance to those countries wishing to initiate ISDN field trials. The document calls on the experience already gained through existing ISDN installations to provide the necessary background and information. Additionally many countries have already progressed towards integrated digital switching and transmission for voice networks, (commonly referred to as IDN) as a necessary precursor to the introduction of ISDN. The primary purpose of the field trial guidelines handbook is to support development of planning and implementation requirements necessary for the conduct of a successful ISDN trial, including evaluation of the results. "



Guidelines for Implementing a Signalling System No. 7 Network

Tue, 01 Jan 1991 00:00:00 GMT

Guidelines for Implementing a Signalling System No. 7 Network
"This Handbook is intended to give the reader an overview of the elements necessary to evaluate the design, implementation and maintenance aspects of an SS No. 7 network. The Handbook is also offered to assist the reader in understanding criteria which impacts the decision to utilize SS No. 7 capabilities - particularly as they relate to cost/benefit analysis of such a decision and also provides a detailed road map through existing CCITT Recommendations. "



Introduction of New Technology in Local Network

Fri, 01 Jan 1993 00:00:00 GMT

Introduction of New Technology in Local Network



Introduction to CHILL

Fri, 01 Jan 1993 00:00:00 GMT

Introduction to CHILL
The purpose of this document is to provide an overview of the main features of CHILL, by concentrating on their semantics and use, rather than on their syntax and subtle exceptional cases. The reader is not required to be familiar with CHILL, but is supposed to know at least another high-level programming language, such as Pascal[3] or C[4].



CHILL User Manual

Wed, 01 Jan 1986 00:00:00 GMT

CHILL User Manual



Guide to the use of ITU-T Publications produced by Study Group 5 aimed at achieving Electromagnetic Compatibility and Safety

Mon, 01 Jan 2001 00:00:00 GMT

Guide to the use of ITU-T Publications produced by Study Group 5 aimed at achieving Electromagnetic Compatibility and Safety
This guide presents an overview of the ITU-T documents (prepared by Study Group 5) giving information on measures to achieve electromagnetic compatibility for telecommunication equipment and installations. This Guide is aimed at telecommunication equipment designers and operators and is also helpful for users in developing countries.





Earthing and Bonding

Wed, 01 Jan 2003 00:00:00 GMT

Earthing and Bonding
This ITU-T Handbook on Earthing and Bonding is for use by engineers designing telecommunication systems, especially those concerned with applying protective measures. It aims to give the user a background to various terms used within the telecommunication and power industry regarding earthing and bonding of equipment and structures (Chapter 1) in various parts of the world. The concepts of earthing and bonding are described (Chapter 2) together with how to implement such methods (Chapters 3 and 4), detailing why these are necessary and what the results may be if they are not performed correctly. The final section of the handbook shows how to evaluate and maintain the effectiveness/quality of the earthing systems and bonding networks thus created.



Mitigation measures for telecommunication installations

Mon, 27 Jun 2005 17:07:00 GMT

Mitigation measures for telecommunication installations
This Handbook describes case studies, supplied by ITU-T Study Group 5 members, of electromagnetic compatibility (EMC) interference problems that have affected telecommunication systems related to emission and immunity, overvoltage and overcurrent and the solutions to such problems. This handbook also indicates typical sources of interference as well as the solutions that can be used to restore correct service to the system or to avoid any such problems before they manifest themselves.
Whilst this handbook does not cover measurement methods or how to measure emissions, overvoltage or overcurrent as these are covered within other ITU-T Recommendations, it does, through the case studies, suggest how to detect certain problems.



Guidelines for Preparing and Conducting Field Trials of Digital Switching Equipments

Thu, 01 Jan 1987 00:00:00 GMT

Guidelines for Preparing and Conducting Field Trials of Digital Switching Equipments



Earthing of Telecommunication Installations

Thu, 01 Jan 1976 00:00:00 GMT

Earthing of Telecommunication Installations
A great deal of research has been done on earthing problems in connection with telecommunications and several technical papers have been published as a result. Although opinions and practices differ, there is also a large measure of unanimity on certain aspects. This first edition of a handbook on earthing is an attempt to set out those principles on which a measure of agreement has been reached, and, in those cases where there are different possibilities, to compare their merits.