Note 1-This Recommendation is partly duplicated in Recommendation G.211 [1]. Note 2- Figure 1/M.300 refers to definitions 1.2 to 1.13. Figures 2/M.300, 3/M.300 and 4/M.300 refer to definitions 1.1 to 1.18. Those of the following definitions that concern links or sections apply, unless otherwise stated, to the combination of both directions of transmission. A distinction between the two directions of transmission may, however, be necessary in the case of unidirectional, multiple-destination links or sections set up over multiple-destination communication satellite systems.