2 Digital subscriber line VDSL2
2.11 Frequency plans for asymmetrical data transfers

Data transmission with asymmetric transfer rates are anticipated rather to domestic subscribers, where the transfer rate is in the downstream direction substantially higher than the transmission speed in the opposite direction.

However, with regard to the number of sub bands for the upstream direction, should VDSL2 connection in asymmetric transfer mode to achieve higher transmission rate than that of older ADSL connection.

Basic frequency plan 998 is further divided into:

Example of 998ADE frequency plan parameters for each profile VDSL2 connections in Europe.

VDSL2 profile

The highest utilized subchannel

Upper limit frequency for downstream [MHz]

Upper limit frequency for upstream [MHz]

8a

1971

8,5

5,2

8b

1971

8,5

5,2

8c

1971

8,5

5,2

8d

1971

8,5

5,2

12a

1971

8,5

12

12b

1971

8,5

12

17a

4095

17,664

12

30a

2479

24890

30

image
Substitution each band in frequency plans for asymmetrical data transfers.