G.992.5 Annex M: Difference between revisions
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{{short description|ITU-T Recommendation}} |
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{{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 |
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| title = Annex M |
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| long_name = |
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| image = ADSL modem Huawei MT882.jpg |
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| caption = |
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| status = In force |
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| year_started = |
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| version = 1.2 |
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| version_date = April 2004 |
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| preview = |
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| preview_date = |
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| organization = [[ITU-T]] |
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| committee = |
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| base_standards = |
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| related_standards = [[G.992.5]] |
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| abbreviation = |
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| domain = [[telecommunications]] |
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| license = Freely available |
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| website = https://www.itu.int/rec/T-REC-G.992.5/ |
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}} |
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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 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> |
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[[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 kHz (as in [[ITU G.992.3 Annex J|Annex J]]), allowing upstream bandwidth to be increased from 1.4 |
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|#ff6600|[[Integrated Services Digital Network|POTS]]/[[Integrated Services Digital Network|ISDN]] |
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|#ffff00|[[Guard Band]] |
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|#00ee00|Upstream |
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|#d40000|Downstream ADSL/ADSL2 |
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|#900000|Additional Downstream ADSL2+| |
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}}]] |
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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 kHz (as in Annex B/[[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. |
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== |
==Deployment== |
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This standard was approved for deployment on Australian networks by the Australian Communications Industry Forum (ACIF) |
This standard was approved for deployment on Australian networks by the Australian Communications Industry Forum (ACIF). |
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The Danish ISPs [[Fullrate]], [[Telenor Denmark|Telenor]] and [[TDC A/S|TDC]] now offers up to 2Mbit upload using this technology. |
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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}}. |
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The Swedish ISP [http://www.telia.se/ Telia] has offered Annex M on their ADSL2+ 24Mbit connections since October 2006. |
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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. |
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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. |
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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. |
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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'. |
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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. |
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==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] |
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*[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] |
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* [https://web.archive.org/web/20120407041626/http://www.billion.com/edu/AnnexM_Whitepaper.pdf White Paper on Annex M] |
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*[http://www.bethere.co.uk UK ADSL2+M ISP be] |
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*[http://www.uk.clara.net UK ADSL2+ and Annex M Service Provider Claranet] |
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==References== |
==References== |
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<references/> |
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{{Reflist}} |
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[[Category:Digital Subscriber Line|G.992.5 Annex M]] |
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[[Category:ITU-T recommendations]] |
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[[ |
[[Category:ITU-T G Series Recommendations]] |
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[[ |
[[Category:Digital subscriber line|G.992.5 Annex M]] |
Latest revision as of 23:55, 25 April 2024
Status | In force |
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Latest version | 1.2 April 2004 |
Organization | ITU-T |
Related standards | G.992.5 |
Domain | telecommunications |
License | Freely available |
Website | https://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]
Legend 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]- ITU-T Recommendation G.992.3 : Asymmetric digital subscriber line transceivers 2 (ADSL2)
- ITU-T Recommendation G.992.5: Asymmetric Digital SubscriberLine (ADSL) transceivers - Extended bandwidth ADSL2 (ADSL2+)
- ITU-T Recommendations: Series G
- ITU-T
- Internode ADSL2+ Annex M FAQ
- White Paper on Annex M
References
[edit]- ^ "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.
- ^ "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.