This Recommendation specifies the control parameters that determine spectral content@ power spectral density (PSD) mask requirements@ a set of tools to support the reduction of the transmit PSD@ the means to measure this PSD for the transmission over power line wiring@ as well as the allowable total transmit power into a specified termination impedance. It complements the system architecture@ physical layer (PHY)@ and data link layer (DLL) specifications in Recommendations ITU-T G.9902 (G.hnem)@ ITU-T G.9903 (G3-PLC) and ITU-T G.9904 (PRIME).