Patent ID: 9509435
Filing Date: 2016-11-29
CPC Classification: H04B,H04J,H04Q

Claim Text:
1. A determination device for a wavelength division multiplex communication system that includes a plurality of transmission devices, each set of adjacent transmission devices being connected by a span, the transmission devices being configured to transmit optical signals of a plurality of wavelengths, each of the optical signals being transmitted via one of a plurality of paths, each of the paths being formed by one or more of the spans, the determination device comprising: a processor configured to: when an optical signal of a wavelength among the plurality of wavelengths is to be switched from a currently used path to a new path, determine spare paths that can be used as the new path, each of the spare paths including at least one newly used span that is not included in the currently used path, for each of the spare paths, determine whether a total number of spans, including the at least one newly used span, forming the spare path is equal to or less than a predetermined upper-limit number of spans, when the total number of spans forming the spare path is not equal to or less than the predetermined upper-limit number of spans, perform no further processing for that path, and when the total number of spans forming the spare path is equal to or less than the predetermined upper-limit number of spans, determine whether an optical signal of at least one wavelength among the plurality of wavelengths is transmittable through the spare path.