Patent ID: 7406126

Claim:
A method for implementing smart Digital Subscriber Line (DSL) for Long reach Digital Subscriber Line (LDSL) systems, the method comprising: defining a candidate system to be implemented by an LDSL system, wherein defining a candidate system comprises defining a number of power spectral density (PSD) masks; optimizing criteria associated with the candidate system to create an optimized candidate system; selecting the optimized candidate system to implement in an LDSL system; wherein, one of the number of masks is defined by the following relations, wherein f is a frequency band in kHz and D is the value of the mask in dBm/Hz: for 0<f≦4, then D=−97.5, with max power in the in 0−4 kHz band of +15 dBrn; for 4<f≦5, then D=−92.5+18.64 log 2(f/4); for 5<f≦5.25, then D=−86.5; for 5.25<f≦16, then D=−86.5+15.25 log 2(f/5.25); for 16<f≦32, then D=−62+25.5 log 2(f/16); for 32<f≦138, then D=−36.5; for 138<f≦323.4375, then D=−31.8; for 323.4375<f≦517.5, then D=−31.8−0.0371×(f−323.4375); for 258.75<f≦1800, then D=max(−39−23.27×log 2 (f/517.5),−65); for 1800<f≦2290, then D=−65−72×log 2 (f/1800); for 2290<f≦3093, then D=−90; for 3093<f≦4545, then D=−90 peak, with max power in the [f,f+1 MHz] window of (−36.5−36×log 2 (f/1104)+60) dBm; and for 4545<f≦11040, then D=−90 peak, with max power in the [f,f+1 MHz] window of −50 dBm.