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See Chinese contents: GB/T 31983.11-2015 GB/T 31983.11-2015: Narrow band power line communication over low-voltage mains -- Part 11: 3 kHz to 500 kHz frequency bands and classifications, limits of output level and electromagnetic disturbances
This Part of GB/T 31983 specifies the frequency band classification for different applications, the output level limit in the available frequency band, the conducted and radiated disturbance limit; and gives the measurement method. This Part does not specify signal modulation methods, coding methods or functional characteristics, nor does it include environmental requirements and tests.
