Patent ID: 7664029
Filing Date: 2010-02-16
Classification: H04J,H04L,H04Q

Abstract:
1. A method of determining a spectral route in an optical telecommunications network between a starting node and a destination node of the network, the method comprising: determining at least one candidate spatial route to connect the starting node to the destination node via network nodes disposed intermediate between the starting node and the destination node, the candidate spatial route consisting of a sequence of spatial route segments, each spatial route segment connecting two nodes of the network directly and being adapted to support a plurality of wavelengths, each wavelength constituting a spectral route segment; sending a route set-up request message from the starting node to the destination node via the candidate spatial route; collecting values of parameters characterizing the spectral route segments, which values of the parameters include values of optical transparency parameters, in the message as the message traverses the candidate spatial route; receiving the message with the collected parameters values in the destination node; and using an optimization method to process the collected parameters values in the destination node upon receipt of the message to select the spectral route and the spatial route that supports the selected spectral route by selecting the wavelength to be used, or the wavelengths to be used successively, to spectrally connect the starting node to the destination node.