This communication network (18) extends between a plurality of input blocks (E1, . . . , EN1) comprising a predetermined number P1 of input ports and a plurality of output blocks (S1, . . . , SN2) comprising at least the same number P2 of output ports as the predetermined number P1. In this network, when the result of the multiplication of the number of input ports P1 by the number of input blocks N1 is even, the number N3 of switches is equal to: N ⁢ ⁢ 3 = N ⁢ ⁢ 1 × P ⁢ ⁢ 1 2 , and when the result of said multiplication is odd, the number N3 of switches is equal to: N ⁢ ⁢ 3 = N ⁢ ⁢ 1 × P ⁢ ⁢ 1 - 1 2 , and, for each switch, the first (30) and second (32) input terminals are each connected to different input blocks (E1, . . . , EN1) and the first (34) and second (36) output terminals are each connected to different output blocks (S1, . . . , SN2).