2 Digital subscriber line VDSL2
2.13 Masks of the power spectral density used in 998 plans

Total of 17 masks are defined in plans 998 in recommendation for VDSL2 connection. Therefore, we show only the parameters for the two PSD masks that are used in the access network of the largest telecommunications operator in the Czech Republic.

The basic parameters of the PSD mask that is used in access networks in Czech Republic.
Shortcut | Label | Utilization of band US0 | Upper limit frequency for upstream or downstream [kHz]
B8-6 | 997-M2x-B | B | 12000
B8-12 | 998ADE17-M2x-B | B | 17664

The following conditions are valid for the upstream band US0 for each of masks:

B - corresponds to Annex B in ITU-T G.992.5.

Both masks PSD used for the transmission of user data an upstream zone labeled US0. The choice of these masks provides suitable properties in spectral compatibility with already installed ADSL/ ADSL2+ systems. Namely connections use the same frequency bands for the same direction of transmission, thereby eliminating crosstalk type NEXT.

PSD mask 998ADE17-M2x-B with marked directions of transmission.