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US 8,712,235 B2Granted
Transmission apparatus and network protection method
AssigneeFujitsu Limited
InventorsYasuki Fujii, Ryoichi Mutoh, Toru Katagiri
Life of this patent
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Abstract
A transmission apparatus includes a processor configured to recognize a number of working failures and a number of protection failures on a network for transmission of wavelength-multiplexed signal light, the number of working failures being the number of failures in signal light in wavelengths at a working entity and the number of protection failures being the number of failures in signal light in wavelengths at a protection entity, configured to perform path switching for each group of signal light in wavelengths that are different from each other and configured to select, when multiple failures occur, restoration processing, on a basis of the number of working failures and the number of protection failures.
Claims7
A transmission apparatus comprising:
- a memory;
- and
- a processor coupled to the memory, the processor being configured to:
- recognize a number of working failures and a number of protection failures between each pair of nodes in a network for transmission of wavelength-multiplexed signal light, the number of working failures being a number of failures in signal light in wavelengths along a working path between each pair of nodes and the number of protection failures being a number of failures in signal light in wavelengths along a protection path between each pair of nodes;
- when a working failure or a protection failure occurs at one or more wavelengths of the wavelength-multiplexed signal light between only one pair of nodes of the network, perform path switching between the working path and the protection path for the only one pair of nodes for all of the wavelengths of the wavelength-multiplexed signal light;
- and
- when a working failure or a protection failure occurs at one or more wavelengths of the wavelength-multiplexed signal light between more than one pair of nodes of the network, perform path switching between the working path and the protection path for only one pair of the more than one pair of nodes based on the recognized number of working failures and number of protection failures for each of the respective pair of nodes.
4 more elements
A transmission apparatus comprising:
- a memory;
- and
- a processor coupled to the memory, the processor being configured to:
- recognize a number of failures in between each pair of nodes in a network for transmission of wavelength-multiplexed signal light;
- when a failure occurs at one or more wavelengths of the wavelength-multiplexed signal light between only one pair of nodes of the network, perform path switching between a working path and a protection path for the only one pair of nodes for all of the wavelengths of the wavelength-multiplexed signal light;
- and
- when a failure occurs at one or more wavelengths of the wavelength-multiplexed signal light between more than one pair of nodes of the network, perform path switching between the working path and the protection path for only one pair of the more than one pair of nodes based on the recognized number of failures for each of the respective pair of nodes.
4 more elements
A network protection method for a transmission apparatus, the method comprising:
- recognizing a number of working failures and a number of protection failures between each pair of nodes in a network for transmission of wavelength-multiplexed signal light, the number of working failures being the number of failures in signal light in wavelengths along a working path between each pair of nodes and the number of protection failures being a number of failures in signal light in wavelengths along a protection path between each pair of nodes;
- when a failure occurs at one or more wavelengths of the wavelength-multiplexed signal light between only one pair of nodes of the network, performing, by a processor, path switching between the working path and the protection path for the only one pair of nodes for all of the wavelengths of the wavelength-multiplexed signal light;
- and
- when a working failure or a protection failure occurs at one or more wavelengths of the wavelength-multiplexed signal light between more than one pair of nodes of the network, performing path switching between the working path and the protection path for only one pair of the more than one pair of nodes based on the recognized number of working failures and number of protection failures for each of the respective pair of nodes.
1 more element
A transmission method comprising:
- recognizing a number of working failures and a number of protection failures between each pair of nodes in a network for transmission of wavelength-multiplexed signal light, the number of working failures being the number of failures in signal light in wavelengths along a working path between each pair of nodes and the number of protection failures being a number of failures in signal light in wavelengths along a protection path between each pair of nodes;
- when a failure occurs at one or more wavelengths of the wavelength-multiplexed signal light between only one pair of nodes of the network, performing, by a processor, path switching between the working path and the protection path for the only one pair of nodes for all of the wavelengths of the wavelength-multiplexed signal light;
- and
- when a working failure or a protection failure occurs at one or more wavelengths of the wavelength-multiplexed signal light between more than one pair of nodes of the network, performing path switching between the working path and the protection path for only one pair of the more than one pair of nodes based on the recognized number of working failures and number of protection failures for each of the respective pair of nodes.
1 more element
Dependencies are inferred from the claim text.