(Continuation of Question 4/15)

Background and justification

To begin to address the exploding demand for high speed access to the Internet and other services, seven Recommendations covering High-speed Digital Subscriber Line (HDSL) and Asymmetrical Digital Subscriber Line (ADSL) were completed during the 1997–2000 study period. The set of six ADSL 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.

These Recommendations have enabled the design and network deployment of HDSL and ADSL transceivers. Experience gained from these activities by manufacturers and network operators may necessitate the revision of these Recommendations and the development of new Recommendations.

Work started on new Recommendations for Very high bit rate Digital Subscriber Line (VDSL) Transceivers, Single pair High bit rate Digital Subscriber Line (SHDSL) Transceivers and Phone-line Networking Transceivers, and will continue in the 2001 – 2004 Study Period.

Question

• What enhancements are needed to Recommendations G.991.1, G.992.1, G.992.2, G.994.1, G.995.1, G.996.1 and G.997.1 in the light of design, network deployment experience, and evolving service requirements?
• What enhancements are needed to Recommendations G.991.1, G.992.1, G.992.2, G.994.1, G.995.1, G.996.1 and G.997.1 to optimize the transport of IP and IP-based services?
• What new Recommendations are needed for transceivers for customer access and in-premises phone line networking systems over metallic pairs?

Study items

Study items will include the following aspects of transceivers for HDSL, SHDSL, ADSL, VDSL and in-premises phone line networking systems:

• Modulation and transport techniques
• Spectrum management
• Handshaking procedures
• Testing procedures
• Physical layer management procedures

These studies will include any specific requirements to optimize the transport of IP and IP-based services.

Specific tasks

• Progress versions of G.992.1, G.992.2, G.994.1, G.995.1, G.996.1 and G.997.1 (these may be revised versions of existing Recommendations or new Recommendations)
• Complete draft new Recommendation(s) G.vdsl
• Complete draft new Recommendation(s) G.shdsl
• Complete draft new Recommendation(s) G.pnt
• Revise Recommendation G.991.1 as required

Relationships

• ITU-T Study Group 4 on management aspects
• ITU-T Study Group 13 on access network architecture
• ITU-T Study Group 16 on multimedia aspects
• ATIS committee T1E1 on xDSL
• DSL Forum on xDSL
• ETSI/TM6 on xDSL
• IEEE
• ATM Forum
• IETF working group on ADSL MIB
• TIA TR-30, TR-41
• ISO/IEC JTC1/SC25 on SOHO wiring guide