Annex M is an ADSL2+ standard that increases the theoretical upstream data rate
beyond standard ADSL2+ limits.
Most Australian ADSL2+ uses the Annex A standard, with a theoretical upstream data rate of 1.4Mb/s. Annex M increases the maximum data rate beyond this limit - up to 3Mb/s. Real-world speeds of up to 2.5Mb/s have been recorded although typical upstream speeds are
around 1.6 to 2.2 Mb/s.
Any increase in upstream speeds will typically result in a matching decrease in downstream speed - typically at a 1:1 ratio. As with Annex A ADSL2+, your speeds also depend on factors such as the length and condition of your telephone line, and the quality of your
wiring (amongst others).
Annex M services were introduced in Australia by Internode in November 2006 and are now available nationally on direct Internode ADSL2+ connections:
Many everyday tasks - for instance, sending email or sharing photos on Facebook - are constrained by your upstream data speeds. Business uses such as working from home, videoconferencing, or publishing web pages - and increasingly social uses like photo and video sharing - place higher demand on upstream speeds.
ADSL2+ Annex M allows dramatic increases in upstream data speed, with real world speeds typically around 1.6 to 2.2Mb/s - sometimes even twice as fast as "standard"
(Annex A) upstream speeds.
These increased upstream speeds allow business operations - such as sending files or serving data - to occur at much faster speeds, improving productivity.
The following are required to use Internode Annex M:
Internode offers ADSL2+ Annex M at no extra cost.
Many devices in Australia now support the ADSL2+ Annex M protocol. Examples include:
Providing that you meet the requirements for doing so you can enable Annex M online through My Internode:
To turn Annex M off, simply return to the Internode ADSL2+ Profiles tool and select a standard line profile, then configure your ADSL2+ modem to use an Annex A connection.
IMPORTANT: If your modem does not achieve Annex M sync, it may negotiate an Annex A connection or fail to connect at all.
If you are unable to connect after enabling Annex M, return your modem configuration to Annex A and/or return your Internode ADSL2+ Profile to a standard profile.
If you are unable to change profile (via an alternate connection), contact our support team who can change the line profile for you.
Real-world observations show that customers often achieve upstream speeds in the range of 1.3 Mb/s up to about 2.5 Mb/s.
Customers on very short/very high quality lines may exceed 2.5 Mbit/s; whereas customers on very long lines may find little or no improvement compared to Annex A.
In addition to normal factors which limit ADSL2+ speeds - such as line length, attenuation, and wiring quality - additional constraints to apply to Annex M.
In particular, “crosstalk” - the network interference caused by Annex M and Annex A services running in adjacent copper pairs within network cables - must be kept to a minimum. The Network Deployment Rules require that we assess the line attenuation on your service, and based on that attenuation we select the range of permitted Annex M connection modes.
This means that your achieved upstream mode may be slower than you expect, for reasons related to the Network Deployment Rules. These rules are not modifiable - they are the basis on which it is legal to deploy Annex M in Australia.
Because of the asymmetric nature of ADSL2+ speeds, each megabit you gain upstream has a larger proportional impact in overall terms than the speed you ‘lose’ on the downstream path.
The theoretical trade-off is about 1:1 - whatever increase in upstream speed will result in a matching decrease in downstream speed.
That said, there are reasons why the trade-off may be worse than 1:1 - you may see a greater drop in downstream sync speed than you gain in upstream speed.
In practice, we have also observed some improvements in both downstream and upstream speeds in Annex M mode - which is theoretically impossible - but likely due to firmware improvements compared to existing Annex A firmware. In a nutshell, if speeds rise in both directions, don’t be concerned - be happy!
Please submit requests for support to our Support team.
In 2005, Internode worked with the Australian Communications Industry Forum (ACIF) to drive the standardisation of the Annex M access method. Through extensive administration and technical work - in conjunction with consultants and the ACIF - changes to the Network Deployment Rules were developed, tested, ratified, and registered - allowing Annex M to be used in Australia.
Full legal Registration of the appropriate Network Deployment Rules occurred on 16 November 2006.