A router for a network is arranged for guiding data traffic from one of a first plurality Ni of inputs (I) to one or more of a second plurality No of outputs (O). The inputs each have a third plurality m of input queues for buffering data. The third plurality m is greater than 1, but less than the second plurality No. The router comprises a first selection facility for writing data received at an input to a selected input queue of said input, and a second selection facility for providing data from an input queue to a selected output. Pairs of packets having mutually different destinations Oj and Ok are arranged in the same queue for a total number of Nj,k inputs characterized in that Nj,k