Canon Kabushiki Kaisha

Emmanuel Raguet

Arnaud Closset

A method for transmitting information is proposed, enabling a synchronization of applicative clocks signals between a transmission device and at least one reception device connected to a communications network. For each stream of a source application, the transmission device: writes to a buffer memory associated with the stream, at the rate of a source applicative clock, pieces of applicative data of the stream coming from the source application, transmits, via the network, pieces of applicative data of the stream at the rate of the network clock. For at least one stream of the source application, the transmission device performs the following steps upon detection of a clock adjustment event: determining a piece of time offset information between a starting instant of a current network cycle and an instant of writing one of the pieces of applicative data of the stream, called a reference piece of data, to the buffer memory associated with the stream; determining a piece of information on position of the reference piece of data from among the pieces of applicative data of this stream to be transmitted via the network during a determined network cycle; transmission on the communications network of the information on time offset and position during the same network cycle as the one in which the reference piece of data is transmitted.

Methods for synchronizing applicative clock signals in a synchronous communications network, corresponding emitter and receiver devices, computer-readable storage means

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.

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Le Rheu, France

Emmanuel Raguet