ITU G.992.5 Annex M

ITU G.992.5 Annex M

ITU G.992.5 Annex M is an ITU (International Telecommunication Union) standard, also referred to as 'ADSL2+M'. ITU G.992.5 Annex M 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 1.4 Mbit/s to 3.3 Mbit/s, with a corresponding decrease in download bandwidth.

Deployment

This standard was approved for deployment on Australian networks by the Australian Communications Industry Forum (ACIF), due to action by Internode. iiNet now offer Annex M on their business plans at additional cost. [ [http://www.iinet.net.au/products/business/annexm.html iiNet Business Annex M ] ]

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, Cybercity, is working on a general offering for Q3 2007 for customers placed close enough to their base stations. Same goes for Danish TDC which have completed their deployment.

Since October 2006, the Swedish ISP [http://www.bredbandsbolaget.se/ Bredbandsbolaget] offers a service called "Bredband 20 Pro" with 20 MBit/s down, 3 Mbit/s up. However, media has lately reported that a majority of their customers fail to get their modems to sync with Bredbandsbolaget's Annex M gateways faster than 16 MBit/s down and 2.5 MBit/s up Fact|date=November 2007.

The Swedish ISP [http://www.telia.se/ Telia] has offered Annex M on their ADSL2+ 24Mbit connections since October 2006.

The Finnish ISP [http://www.suomicom.fi/kovaankayttoon.php SuomiCom] offers 4/3Mbit, 8/3Mbit, 12/3Mbit and 24/3Mbit on ZyXEL's Annex M hardware. Usually upstream speeds between 2-2.5Mbit/s are reported with these services. ISP [http://nebulazone.fi/ Nebula] also offers Annex M on some of their more expensive packages. 8Mbit/s, 12Mbit/s or 24Mbit/s down and 3Mbit/s up.

The Belgian ISP [http://www.dommel.be/ Dommel(Schedom)] Recently offers ADSL2+ Annex M (24Mbit/s down and 3Mbit/s up) in their "cityconnect" package in the city of Leuven (on their own DSLAMs). Two other cities have been announced for the second quarter of 2008, Kessel-Lo (near Leuven) and Sint-Truiden. Other cities to follow at a later time.

ee also

*ADSL
*ADSL2+

External links

* [http://www.itu.int/rec/T-REC-G.992.5/en ITU-T Recommendation G.992.5: Asymmetric Digital SubscriberLine (ADSL) transceivers - Extended bandwidth ADSL2 (ADSL2+)]
* [http://www.itu.int/rec/recommendation.asp?type=products&lang=e&parent=T-REC-G ITU-T Recommendations: Series G]
* [http://www.itu.int/ITU-T/index.html ITU-T]
* [http://www.internode.on.net/support/faq/broadband_adsl/adsl2_annex_m/ Internode ADSL2+ Annex M FAQ]
* [http://www.bethere.co.uk UK ADSL2+M ISP be]
* [http://www.members.iinet.net.au/~swilkinson/dsl.html Adsl2 Frequency Chart]

References

Also known as

*AnxM



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