G.992.5 Annex M: Difference between revisions

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{{short description|ITU-T Recommendation}}
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{{DSL technologies}}
{{Infobox technology standard
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'''Annex M''' is an optional specification in [[ITU-T]] recommendations [[ITU G.992.3/4|G.992.3]] (ADSL2) and [[ITU G.992.5|G.992.5]] (ADSL2+), also referred to as '''ADSL2 M''' and '''ADSL2+ M'''. This specification extends the capability of commonly deployed Annex A by more than doubling the number of [[upstream]] bits. The data rates can be as high as 12 or 24 [[Mbit/s]] downstream and 3 Mbit/s upstream depending on the distance from the [[Digital subscriber line access multiplexer|DSLAM]] to the customer's premises.
| title = Annex M
| long_name =
| image = ADSL modem Huawei MT882.jpg
| caption =
| status = In force
| year_started =
| version = 1.2
| version_date = April 2004
| preview =
| preview_date =
| organization = [[ITU-T]]
| committee =
| base_standards =
| related_standards = [[G.992.5]]
| abbreviation =
| domain = [[telecommunications]]
| license = Freely available
| website = https://www.itu.int/rec/T-REC-G.992.5/
}}
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'''Annex M''' is an optional specification in [[ITU-T]] recommendations [[ITU G.992.3/4|G.992.3]] (ADSL2) and [[ITU G.992.5|G.992.5]] (ADSL2+), also referred to as '''ADSL2 M''' and '''ADSL2+ M'''. This specification extends the capability of commonly deployed Annex A by more than doubling the number of [[Upstream (networking)|upstream]] bits. The data rates can be as high as 12 or 24 [[Mbit/s]] downstream and 3&nbsp;Mbit/s upstream depending on the distance from the [[Digital subscriber line access multiplexer|DSLAM]] to the customer's premises.<ref>{{Cite web|title=G.992.3: Asymmetric digital subscriber line transceivers 2 (ADSL2)|url=https://www.itu.int/rec/T-REC-G.992.3/|url-status=live|archive-url=https://web.archive.org/web/20210613153731/https://www.itu.int/rec/T-REC-G.992.3/|archive-date=2021-06-13|access-date=2021-06-13|website=www.itu.int}}</ref><ref>{{Cite web|title=G.992.5: Asymmetric digital subscriber line 2 transceivers (ADSL2)- Extended bandwidth ADSL2 (ADSL2plus)|url=https://www.itu.int/rec/T-REC-G.992.5/|url-status=live|archive-url=https://web.archive.org/web/20210613154131/https://www.itu.int/rec/T-REC-G.992.5/|archive-date=2021-06-13|access-date=2021-06-13|website=www.itu.int}}</ref>


[[File:ADSL annex overview.svg|thumb|600px|right|Frequency plan for common ADSL standards and annexes. {{legend-table|lang=en|title=Legend
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The main difference between this specification and Annex A is that the upstream/downstream frequency split has been shifted from 138 [[kHz]] up to 276&nbsp;kHz (as in [[ITU G.992.3 Annex J|Annex J]]), allowing upstream bandwidth to be increased from 1.4 Mbit/s to 3.3 Mbit/s, with a corresponding decrease in download bandwidth.
|#ff6600|[[Integrated Services Digital Network|POTS]]/[[Integrated Services Digital Network|ISDN]]
|#ffff00|[[Guard Band]]
|#00ee00|Upstream
|#d40000|Downstream ADSL/ADSL2
|#900000|Additional Downstream ADSL2+|
}}]]
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The main difference between this specification and Annex A is that the upstream/downstream frequency split has been shifted from 138 [[kHz]] up to 276&nbsp;kHz (as in Annex B/[[ITU G.992.3 Annex J|Annex J]]), allowing upstream bandwidth to be increased from 1.4&nbsp;Mbit/s to 3.3&nbsp;Mbit/s, with a corresponding decrease in download bandwidth.


== Deployment ==
==Deployment==
This standard was approved for deployment on Australian networks by the Australian Communications Industry Forum (ACIF), due to action by [[Internode Systems|Internode]]. [[iiNet]] now offer Annex M on their business plans for a one-time additional fee.<ref>[http://www.iinet.net.au/products/business/annexm.html iiNet Business Annex M<!-- Bot generated title -->]</ref>
This standard was approved for deployment on Australian networks by the Australian Communications Industry Forum (ACIF).

The Danish ISPs [[Fullrate]], [[Telenor Denmark|Telenor]] and [[TDC A/S|TDC]] now offers up to 2Mbit upload using this technology.

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.com/ 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. Now it is available in and around various large cities and city centers.

The British LLU ISP [http://www.bethere.co.uk/ Be Un Limited] offers a feature on their "pro" package called "Upload Plus". This is actioned from a support ticket and changes the customers connection from ADSL2+ Annex A to ADSL2+ Annex M. "Pro" users get Annex M by default.
Other British ISPs, [http://broadband.nildram.net/enhanced-upstream/ Nildram], [http://www.pipex.co.uk/business/broadband/pro/ Pipex] (both owned by Tiscali) and [http://www.uk.clara.net Claranet] have recently started offering enhanced upstream to their customers. Claranet refer to their Annex M product as 'Premium SDSL'.

The Spanish ISP [http://www.jazztel.es/ Jazztel] implemented Annex M in January 2009, with a feature called "Turbo Up" and "Turbo Down" that allows the user to choose between a higher upstream or downstream speed, plus an option to enable or disable FastPath on demand. In most cases it's imposible to achieve more than 1Mbit/s upstream with the ISP provisioned [[Customer-premises equipment|CPE]], with better equipment it's possible to reach 2.5Mbit/s upstream.


==See also==
==See also==
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*[http://www.itu.int/ITU-T/index.html ITU-T]
*[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.internode.on.net/support/faq/broadband_adsl/adsl2_annex_m/ Internode ADSL2+ Annex M FAQ]
* [https://web.archive.org/web/20120407041626/http://www.billion.com/edu/AnnexM_Whitepaper.pdf White Paper on Annex M]
*[http://www.bethere.co.uk UK ADSL2+M ISP be]

*[http://www.uk.clara.net UK ADSL2+ and Annex M Service Provider Claranet]
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{{DSL technologies}}


==References==
==References==
<references/>
{{Reflist}}


[[Category:Digital Subscriber Line|G.992.5 Annex M]]


[[es:ITU G.992.5 Annex M]]
[[Category:ITU-T recommendations]]
[[ru:ITU G.992.5 Annex M]]
[[Category:ITU-T G Series Recommendations]]
[[sv:ITU G.992.5 Annex M]]
[[Category:Digital subscriber line|G.992.5 Annex M]]

Latest revision as of 23:55, 25 April 2024

Annex M
StatusIn force
Latest version1.2
April 2004
OrganizationITU-T
Related standardsG.992.5
Domaintelecommunications
LicenseFreely available
Websitehttps://www.itu.int/rec/T-REC-G.992.5/

Annex M is an optional specification in ITU-T recommendations G.992.3 (ADSL2) and G.992.5 (ADSL2+), also referred to as ADSL2 M and ADSL2+ M. This specification extends the capability of commonly deployed Annex A by more than doubling the number of upstream bits. The data rates can be as high as 12 or 24 Mbit/s downstream and 3 Mbit/s upstream depending on the distance from the DSLAM to the customer's premises.[1][2]

Frequency plan for common ADSL standards and annexes.
Legend
  POTS/ISDN
  Guard Band
  Upstream
  Downstream ADSL/ADSL2
  Additional Downstream ADSL2+

The main difference between this specification and Annex A is that the upstream/downstream frequency split has been shifted from 138 kHz up to 276 kHz (as in Annex B/Annex J), allowing upstream bandwidth to be increased from 1.4 Mbit/s to 3.3 Mbit/s, with a corresponding decrease in download bandwidth.

Deployment[edit]

This standard was approved for deployment on Australian networks by the Australian Communications Industry Forum (ACIF).

See also[edit]

External links[edit]

References[edit]

  1. ^ "G.992.3: Asymmetric digital subscriber line transceivers 2 (ADSL2)". www.itu.int. Archived from the original on 2021-06-13. Retrieved 2021-06-13.
  2. ^ "G.992.5: Asymmetric digital subscriber line 2 transceivers (ADSL2)- Extended bandwidth ADSL2 (ADSL2plus)". www.itu.int. Archived from the original on 2021-06-13. Retrieved 2021-06-13.
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