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Annex M is an optional specification in 
This standard was approved for deployment on Australian networks by the Australian Communications Industry Forum (ACIF).
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
Internode ADSL2+ Annex M FAQ
White Paper on Annex M
{{DSL technologies ITU-T recommendations ITU-T G Series Recommendations
ITU-T
The International Telecommunication Union Telecommunication Standardization Sector (ITU-T) is one of the three Sectors (branches) of the International Telecommunication Union (ITU). It is responsible for coordinating Standardization, standards fo ...
recommendations G.992.3 (ADSL2) and G.992.5
G.992.5 (also referred to as ADSL2+, G.dmt.bis+, and G.adslplus) is an ITU-T standard for asymmetric digital subscriber line (ADSL) broadband Internet access. The standard has a maximum theoretical downstream sync speed of 24 megabits per secon ...
(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
Upstream may refer to:
* Upstream (hydrology), the direction towards the source of a stream (against the direction of flow)
* Upstream (bioprocess), part of therapeutic cell manufacturing processes from early cell isolation and cultivation until ...
bits. The data rates can be as high as 12 or 24 Mbit/s
In telecommunications, data transfer rate is the average number of bits (bitrate), characters or symbols (baudrate), or data blocks per unit time passing through a communication link in a data-transmission system. Common data rate units are multi ...
downstream and 3 Mbit/s upstream depending on the distance from the DSLAM
A digital subscriber line access multiplexer (DSLAM, often pronounced ''DEE-slam'') is a network device, often located in telephone exchanges, that connects multiple customer digital subscriber line (DSL) interfaces to a high-speed digital co ...
to the customer's premises.
The main difference between this specification and Annex A is that the upstream/downstream frequency split has been shifted from 138 kHz
The hertz (symbol: Hz) is the unit of frequency in the International System of Units (SI), often described as being equivalent to one event (or cycle) per second. The hertz is an SI derived unit whose formal expression in terms of SI base uni ...
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.
This standard was approved for deployment on Australian networks by the Australian Communications Industry Forum (ACIF).
See also
*ADSL2
ITU G.992.3 is an ITU (International Telecommunication Union) standard, also referred to as ADSL2 or G.dmt.bis. It optionally extends the capability of basic ADSL in data rates to 12 Mbit/s downstream and, depending on Annex version, up to 3 ...
*ADSL2+
G.992.5 (also referred to as ADSL2+, G.dmt.bis+, and G.adslplus) is an ITU-T standard for asymmetric digital subscriber line (ADSL) broadband Internet access. The standard has a maximum theoretical downstream sync speed of 24 megabits per secon ...
References
External links
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
Internode ADSL2+ Annex M FAQ
White Paper on Annex M
{{DSL technologies ITU-T recommendations ITU-T G Series Recommendations
G.992.5 Annex M
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 mor ...