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]
 | |
| Status | In force |
|---|---|
| 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/ |
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
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.