This Recommendation provides radio-frequency channel arrangements for fixed wireless systems operating in the upper 6 GHz band (6 425-7 125 MHz), which may be used for high-, medium- and low-capacity fixed systems. The channel separation recommended in the main text are 40, 30, 20, 10 and 5 MHz with the interleaved arrangements with possible use of the co-channel arrangements; recommended arrangements with 14, 7 and 3.5 MHz channel separations in combination with the 30 MHz arrangement are also provided in Annex 2. The use of multi-carrier transmission based on these arrangements is also considered in the Annex 1 providing detailed description of this application.