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ITU-T Study Group 15 List of Questions Under Study (Study Period 2005-2008) |
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ITU-T SG 15 Question 4/15 |
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Transceivers for customer access and in-premises networking systems on metallic conductors
(Continuation of Question 4/15)
- Motivation
Seven Recommendations covering High-speed Digital Subscriber Line (HDSL) and Asymmetrical Digital
Subscriber Line (ADSL) were completed during the 1997–2000 study period to address the exploding
demand for high-speed access to the Internet and other services. These Recommendations, which allow
multi-Megabit/s network access over ordinary telephone subscriber lines, specify transceiver functions,
reference configuration and procedures for handshaking, testing and physical layer management.
In the light of experience gained from the design and network deployment of HDSL and ADSL
transceivers, and to meet customer demand for higher bit rate data services, three new ADSL
Recommendations were completed during the 2001 – 2004 Study Period. In addition, five
new Recommendations covering Single pair High bit rate Digital Subscriber Line (SHDSL) Transceivers,
Very high bit rate Digital Subscriber Line (VDSL) Transceivers and in-premises Networking Transceivers,
as well as revisions to existing Recommendations on procedures for handshaking, testing and physical
layer management were also completed.
During the first half of the 2005 – 2008 Study Period new Recommendations on pair-bonding and VDSL2
were completed as well as revisions to existing Recommendations on ADSL, procedures for handshaking,
testing and physical layer management.
The continuing customer demand for ever higher bit rate data services, high-speed Internet access and
other innovative services, and the needs of network operators to fully exploit their installed base of
copper cables, will require new Recommendations and enhancements to existing Recommendations covering
all aspects of Digital Subscriber Line and in-premises Networking Transceivers including, but not limited to,
the transport of higher level protocols, the management and test of the access systems, and the spectral
management aspects, during the remainder of the 2005 – 2008 Study Period.
The following major Recommendations, in force at the time of approval of this Question, fall under
its responsibility: G.991.n series, G.992.n series, G.993.n series, G.994.1, G.995.1, G.996.1, G.997.1,
G.998.n series, G.995x series.
- Question
What enhancements are needed to the G.99x and G.995x series of Recommendations
- in the light of design, network deployment experience, and evolving service requirements?
- to optimise the transport of IP-based services?
What new Recommendations are needed
- for transceivers for customer access over metallic pairs?
- for transceivers for in-premises networking over metallic conductors such as phone-line, co-axial, data (e.g. CAT5) and power cables?
- to carry out line testing?
- to enable higher bit rates to be achieved by means of pair bonding?
Study items include, but are not limited to:
- Modulation and transport techniques, tools for spectrum management (including dynamic spectrum management), real noise environments, handshaking procedures, testing procedures, physical layer management procedures.
- These studies should take account of the different regulatory environments around the world.
These studies will include any specific requirements:
- to optimise the transport of IP-based services
- to optimise the transport of Ethernet based services
- to support the management of access and in-premises networking systems and equipment operating over metallic conductors
- Tasks
Tasks include, but are not limited to:
- Maintenance and enhancements of existing Recommendations and production of new Recommendations in the G.99x and G.995x series.
Note: An up-to-date status of work under this Question is contained in the
SG15 Work Program.
- Relationships
- Recommendations:
- G.991.n series, G.992.n series, G.993.n series, G.994.1, G.995.1, G.996.1, G.997.1, G.998.n series, G.995x series
- Questions:
- Q.2/15, Q.9/15, Q.12/15, Q.14/15
- Study Groups:
- ITU-T SG4 on management aspects and NGNMFG
- ITU-T SG5 on EMC
- ITU-T SG6 on various copper cable topics
- ITU-T SG9 on television and sound program transport
- ITU-T SG16 on multimedia and FS-VDSL aspects
- Standardisation bodies, forums and consortia:
- ATIS Committee NIPP (Network Interfaces, Power and Protection) on xDSL related topics
- CCSA on xDSL related topics
- CEPCA on power line communication
- DSL Forum on Test methodology and performance
- ETSI TM6 on xDSL related topics
- ETSI PLT on power line communication
- HGI on residential gateway
- HomePlug on power line communication
- HomePNA on phone-line networking
- IEC CISPR I on EMC requirements
- IEEE on Ethernet and power line communication
- IETF on xDSL MIBs
- ISO/IEC JTC1/SC25 on interconnection of Information Technology equipment
- MFA Forum on ATM
- MoCA on multi-media over co-ax
- TIA TR-41 on Spectral management considerations
- TTA on xDSL related topics
- TTC on xDSL related topics
- TMF on MTOP WS management solutions
- UPA on power line communication
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