Motivation

With the liberalization in telecommunications, unbundling and co-location become common-place in telecommunications networks. In co-located telecommunications installations, minimum requirements on EMC, Resistibility and Safety are necessary to ensure safe and problem-free operation. 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 and crosstalk are not only related to the transmission performance of the services, but also strongly related to EMC performance of the services. Therefore, those characteristics grow increasingly important.

This area needs some technical study so that the telecommunications industry has the ability to ensure that requirements for EMC can be met in an appropriate way, and technical solutions which assure the network integrity and interoperability, the easy use of equipment and access security.

The following Recommendations, in force at the time of approval of this Question, fall under its responsibility:

• K.10, K.58, K.59 and L.62

Question

Study items to be considered include, but are not limited to:

Unbalance is an essential factor to be studied in this question. Methodologies for measuring cable characteristics, such as unbalance, NEXT, or FEXT, are one of the issues to be clarified, in order to ensure the performance of the cable under the unbundling.

This question will also review the existing Recommendations on liberalization to ensure that they remain accurate and appropriate to the telecommunications industry and environment.

Study items to be considered include, but not limited to:

• Measurement method for characteristics of telecommunication lines or telecommunication ports; especially frequency range of broadband services;
• Methods for the evaluation of electromagnetic environment and elimination of troubles under liberalized conditions;
• Methodology for distinguishing responsibilities on EMC troubles under liberalized conditions.
• Guidance to ensure performance of the cable under unbundling conditions, including the technical and practical solutions that guarantee, for the main topologies in use worldwide, the integrity, reliability, interoperability, ease of implementation, physical and fire security and other related aspects.
• the safe coexistence in the same network element and spaces of more than one operator, providing multiple-services such as voice, ISDN, xDSL and/or other, without any kind of negative interaction.

Tasks

To ensure safe and problem-free operation in unbundled environments, tasks include, but are not limited to:

• A new or revised Recommendation on measurement method for characteristics of telecommunication cable and telecommunication port of the equipment in the frequency range of the broadband services, and protection or improvement method against effects of these characteristics under liberalized conditions.
• As unbundling is experiencing a very high speed evolution, this study group must identify the market needs and provide standardisation solutions at the appropriate time.
• Motivate ITU members to share their national experience and spread the collected knowledge related to practical aspects of unbundling and co-location by means of active participation in events, workshops, publications, press releases, etc.
• Maintenance and enhancement of Recommendations K.10, K.58, K.59 and L.62.

An up-to-date status of work under this Question is contained in the SG 5 Work Program (use URL as shown in the table below).

Relationships

Recommendations:

• G.117,L.75, L.19 and other K-series

Questions:

• 2, 4, 5, 6, 9, 10, 11, 12 and 14/5

Study Groups:

• ITU-T SG 12 and 15

Standardization bodies:

• ETSI, ISO/IEC JTC1/SC25, IEC TC46/TC86, CISPR