ITU-T G.9955 and G.9956: The two G.hnem standards
ITU-T G.9955 and G.9956 contain the physical
layer specification and the data link layer specification,
respectively, for narrowband OFDM powerline
communications transceivers for communications via
alternating current and direct current electric powerlines
over frequencies below 500 kHz. These ITU-T standards
support indoor and outdoor communications over low
voltage lines, medium voltage lines, through transformer
low-voltage to medium-voltage, and through transformer
medium-voltage to low-voltage powerlines in both urban
and long distance rural communications.