Method for switching an optical data stream, computer program product and corresponding storage means and node

摘要

A method and apparatus for switching an optical data stream via an optical network node, capable of switching optical data received at input ports to output ports. The method includes the following steps performed by a processing chain upon detection of a stream at a given wavelength by a given input port: determining a resource of the node based on a predetermined routing policy such that, for a given wavelength common to source and destination nodes of the stream, routing within the network is carried out according to a routing tree covering the network, a root of the tree being the destination node; consulting an occupancy table for the resource, indicating if at least one possible preceding stream is using the resource; determining a delay to be applied by the processing chain to prevent a collision between the stream and the possible preceding stream; and configuring the processing chain to apply the delay.

主权项

1. A method for switching an optical data stream by a node of an optical network capable of switching optical data received at input ports to output ports, wherein the method comprises:
a step of managing collisions comprising steps including, upon detection of a start of reception of a given stream of optical data on a given wavelength by a given input port, the given stream being intended for processing by a given processing line comprising a variable delay line: determining a resource of the node as a function of a sensor having detected the given stream on the given wavelength and as a function of a predetermined transporting policy such that, for the given wavelength which is common to the source and destination nodes of the given stream, transporting in the optical network is done according to a routing tree that covers said optical network and of which one root is the destination node, said resource being either an output port or a set of input ports; consulting a table of occupancy of said resource, said table of occupancy indicating whether at least one preceding stream, if any, uses said resource; determining a delay to be applied by the given processing line to prevent collision between the given stream and said at least one preceding stream, if any; and configuring the variable delay line of the given processing line so that the variable delay line applies the determined delay.