A POWER CUTBACK STRATEGY FOR G.DMT.BIS AND G.LITE.BIS

摘要

This invention relates to an extended politeness power cutback for both G.lite.bis and G.dmt.bis D/S and U/S signals, together with a G.hs.bis-defined maximum U/S and D/S transmit PSD levels. This latter is applied regardless the loop length and it is assumed to be based on MIB indications and on ATU-R and ATU-C characteristics. The rationale behind it is to both impose a general power consumption limitation and to limit interference into adjacent pairs (this being particularly important in DLC deployments). A G.hs.bis transaction (to be defined in futu re contributions) would exchange and negotiate the requirements coming from the operator (MIB- based) and from the ATUs. The extended politeness cutback can be applied on top of the max P SD limitation on short loops. For the ATU-C is ensures a statistical power savings over the served subscriber area without a significant data rate degradation. For U/S, it reduces the self FE XT into adjacent pairs, thus improving the throughput for the modems served by the same feeder cable . This feature could be disabled by the operator when in presence of a NEXT-limited environment. The contribution specifically refers to G.dmt.bis; some changes are required for G.lite.bis when in presence of a Fast Retrain Power cutback.