ITU G.992.5 Annex L

From Wikipedia, the free encyclopedia

ADSL standards

ADSL

ANSI T1.413-1998 Issue 2

G.DMT

ITU G.992.1

G.Lite

ITU G.992.2

ADSL2

ITU G.992.3/4
ITU G.992.3/4 Annex J
ITU G.992.3/4 Annex L

ADSL2+

ITU G.992.5
ITU G.992.5 Annex L
ITU G.992.5 Annex M

This is an ITU (International Telecommunication Union) standard, also referred to as RE ADSL2+. This extends the capability of basic ADSL by doubling the number of downstream bits. The data rates can be as high as 24 Mbit/s downstream and 1 Mbit/s upstream depending on the distance from the DSLAM to the customer's home.

The main difference between this specification and ITU G.992.5 (ADSL2+) is the maximum distance that can be used. This increase in distance is made possible by using more power on the lower frequencies, enabling the link to work at a distance of 7 kilometers, or 23,000 ft. Although the standard development is completed and verified by the ITU, the owners of the local loop network don't allow this standard to be used because the high power can create audible cross-talk.