DSL technologies
Technology	ITU-standard
ADSL	ANSI T1.413 Issue 2 ITU G.992.1 (G.DMT) ITU G.992.2 (G.Lite)
ADSL2	ITU G.992.3/4 ITU G.992.3 Annex J ITU G.992.3 Annex L
ADSL2+	ITU G.992.5 ITU G.992.5 Annex L ITU G.992.5 Annex M
HDSL	ITU G.991.1
HDSL2
IDSL
MSDSL
PDSL
RADSL
SDSL
SHDSL	ITU G.991.2
UDSL
VDSL	ITU G.993.1
VDSL2	ITU G.993.2

ITU G.992.3 is an ITU (International Telecommunication Union) standard, also referred to as ADSL2. It optionally extends the capability of basic ADSL in data rates to 12 Mbit/s downstream and 3.5 Mbit/s upstream (with a mandatory capability of ADSL2 transceivers of 8 Mbit/s downstream and 800 Kbit/s upstream). Actual speeds may reduce depending on line quality - usually the most significant factor in line quality is the distance from the DSLAM to the customer's equipment.

ITU G.992.4 is a standard for splitterless ADSL2 with data rate limited to 1.536 MB/s downstream and 512 kbit/s upstream.

See also

• ADSL
• ADSL2+
• List of device bandwidths

External links

• ITU-T Recommendation G.992.3 : Asymmetric digital subscriber line transceivers 2 (ADSL2)
• ITU-T Recommendation G.992.4 : Splitterless asymmetric digital subscriber line transceivers 2 (splitterless ADSL2)
• ADSL2 & ADSL2+ White Paper (PDF) (Aware)

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