ITU G.992.5 Annex M

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ADSL standards

ADSL

ANSI T1.413-1998 Issue 2

G.DMT

ITU G.992.1

G.Lite

ITU G.992.2

ADSL2

ITU G.992.3/4
ITU G.992.3/4 Annex J
ITU G.992.3/4 Annex L

ADSL2+

ITU G.992.5
ITU G.992.5 Annex L
ITU G.992.5 Annex M

This is an ITU (International Telecommunication Union) standard, also referred to as 'ADSL2+M'. This extends the capability of basic ADSL2 by doubling the number of upstream bits. The data rates can be as high as 24 Mbit/s downstream and 3.5 Mbit/s upstream depending on the distance from the DSLAM to the customer's home.

The main difference between this specification and ITU G.992.5 (ADSL2+) is that the upstream/downstream frequency split has been shifted from 138kHz up to 276kHz, allowing upstream bandwidth to be increased from 1 Mbit/s to 3.5 Mbit/s.

[edit] Deployment

This standard was approved for deployment on Australian networks by the Australian Communications Industry Forum (ACIF), due to action by Internode.

ADSL2+M is also offered by UK LLU broadband provider Be* referred to as "upload plus", although only on their top price "Be pro" package.

The Danish ISP Fullrate has also begun to deploy this technology to offer up to 2Mbit upload. Another Danish ISP, is working on a general offering for Q3 2007 for customers placed close enough to their base stations.

The Swedish ISP Bredbandsbolaget offers a service called "Bredband 20 Pro" with 20 MBit/s down, 3Mbit/s up.