A method for managing bandwidth in a synchronous communications network including a plurality of nodes, the network implementing a first clocking which defines a data-processing cycle including a determined number of virtual channels, the data-processing cycle being defined by a current data-processing frequency, the plurality of nodes including at least one transmitter node associated with at least one generator application, each generator application being associated with at least one virtual channel for transmitting its data, the virtual channel or channels associated with a given generator application being filled one by one from the first to a last virtual channel. Such a method includes the following steps performed for a given generator application: determining a rate of use of the last virtual channel of the set of virtual channels; adjusting the current data-processing frequency; and allocating an integer number of virtual channels.