ITU G.992.5 Annex M 1

ITU G.992.5 Annex M

DSL technologies

Standard

ADSL ANSI T1.413 Issue 2ITU G.992.1(G.DMT)ITU G.992.2 (G.Lite)

ADSL2 ITU G.992.3/4ITU G.992.3 Annex JITU G.992.3 Annex L

ADSL2+ ITU G.992.5ITU 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

Annex M is an optional specification in ITU-T recommendations G.992.3 (ADSL2) and G.992.5 (ADSL2+), alsoreferred to as ADSL2 M and ADSL2+ M. This specification extends the capability of commonly deployed Annex Aby more than doubling the number of upstream bits. The data rates can be as high as 12 or 24 Mbit/s downstream and3 Mbit/s upstream depending on the distance from the DSLAM to the customer's premises.The main difference between this specification and Annex A is that the upstream/downstream frequency split hasbeen shifted from 138 kHz up to 276 kHz (as in Annex J), allowing upstream bandwidth to be increased from 1.4Mbit/s to 3.3 Mbit/s, with a corresponding decrease in download bandwidth.

ITU G.992.5 Annex M 2

DeploymentSanta Rosa, California-based US ISP Sonic.net is now testing Annex M on both single-pair and pair-bonded"Fusion" ADSL2+ service. The company reports that customers can see 1.3-2.5 Mbit/s upstream per pair with AnnexM enabled.This standard was approved for deployment on Australian networks by the Australian Communications IndustryForum (ACIF), due to action by Internode. iiNet now offer Annex M on their business plans for a one-timeadditional fee.[1]

The Danish ISPs Fullrate, Telenor and TDC offers up to 2 Mbit upload using this technology.Since October 2006, the Swedish ISP Bredbandsbolaget [2] offers a service called "Bredband 20 Pro" with 20 MBit/sdown, 3 Mbit/s up. However, media has lately reported that a majority of their customers fail to get their modems tosync with Bredbandsbolaget's Annex M gateways faster than 16 MBit/s down and 2.5 MBit/s up .The Swedish ISP Telia [3] has offered Annex M on their ADSL2+ 24Mbit connections since October 2006.The Finnish ISP SuomiCom [4] offers 4/3 Mbit, 8/3 Mbit, 12/3 Mbit and 24/3 Mbit on ZyXEL's Annex M hardware.Usually upstream speeds between 2-2.5 Mbit/s are reported with these services. ISP Nebula [5] also offers Annex Mon some of their more expensive packages. 8 Mbit/s or 24Mbit/s down and 3 Mbit/s up.The Belgian ISP Dommel(Schedom) [6] Recently offers ADSL2+ Annex M (24Mbit/s down and 3 Mbit/s up) in their"cityconnect" package in the city of Leuven (on their own DSLAMs). Two other cities have been announced for thesecond quarter of 2008, Kessel-Lo (near Leuven) and Sint-Truiden. Now it is available in and around various largecities and city centers.The British LLU ISP Be Un Limited [7] offers a feature on their "pro" package called "Upload Plus". This is actionedfrom 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, Nildram [8], Pipex [9] (both owned by TalkTalk), CambridgeMatrix [10] and Claranet [11] have recently started offering enhanced upstream to their customers. Claranet refer totheir Annex M product as 'Premium SDSL'.The Spanish ISP Jazztel [12] implemented Annex M in January 2009, with a feature called "Turbo Up" and "TurboDown" that allows the user to choose between a higher upstream or downstream speed, plus an option to enable ordisable FastPath on demand. In most cases it's imposible to achieve more than 1.5 Mbit/s upstream with the ISPprovisioned CPE, with better equipment it's possible to reach 2.5 Mbit/s upstream.

See also• ADSL2• ADSL2+

External links• ITU-T Recommendation G.992.3 : Asymmetric digital subscriber line transceivers 2 (ADSL2) [13]

• ITU-T Recommendation G.992.5: Asymmetric Digital SubscriberLine (ADSL) transceivers - Extendedbandwidth ADSL2 (ADSL2+) [14]

• ITU-T Recommendations: Series G [15]

• ITU-T [16]

• Internode ADSL2+ Annex M FAQ [17]

• UK ADSL2+M ISP be [18]

• UK ADSL2+ and Annex M Service Provider Claranet [11]

ITU G.992.5 Annex M 3

References[1] iiNet Business Annex M (http:/ / www. iinet. net. au/ products/ business/ annexm. html)[2] http:/ / www. bredbandsbolaget. se/[3] http:/ / www. telia. se/[4] http:/ / www. suomicom. fi/ kovaankayttoon. php[5] http:/ / nebulazone. fi/[6] http:/ / www. dommel. com/[7] http:/ / www. bethere. co. uk/[8] http:/ / broadband. nildram. net/ enhanced-upstream/[9] http:/ / www. pipex. co. uk/ business/ broadband/ pro/[10] http:/ / www. cambridgematrix. co. uk/ modules. php?name=Content& pa=showpage& pid=4/[11] http:/ / www. uk. clara. net[12] http:/ / www. jazztel. es/[13] http:/ / www. itu. int/ rec/ T-REC-G. 992. 3/ en[14] http:/ / www. itu. int/ rec/ T-REC-G. 992. 5/ en[15] http:/ / www. itu. int/ rec/ recommendation. asp?type=products& lang=e& parent=T-REC-G[16] http:/ / www. itu. int/ ITU-T/ index. html[17] http:/ / www. internode. on. net/ support/ faq/ broadband_adsl/ adsl2_annex_m/[18] http:/ / www. bethere. co. uk

Article Sources and Contributors 4

Article Sources and ContributorsITU G.992.5 Annex M  Source: http://en.wikipedia.org/w/index.php?oldid=394994224  Contributors: Alimentum, Armando82, BD2412, Buzeri, Doctordsl, Edans, Empaler, FironDraak, GonX,Gr1st, Grapetonix, Guspaz, JonathanRidgway, K. Annoyomous, Lightmouse, Martin Schwenke, MrOllie, MrStalker, Mushin, Rjwilmsi, Robertvan1, Wayne Hardman, Zoef1234, 67 anonymousedits

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