Differentiated resilience in optical networks
First Claim
1. Apparatus for use in a transparent wavelength routed optical network having a number of working paths for traffic, and two or more different optical layer restoration schemes to provide different levels of resilience, the apparatus having:
- a restoration allocator arranged to allocate a different one of the optical layer restoration schemes, to different parts of the traffic, for use if their working path becomes unavailable.
1 Assignment
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Accused Products
Abstract
A transparent wavelength routed optical network has two or more different optical layer restoration schemes to provide different levels of resilience, and a restoration allocator arranged to allocate the optical layer restoration schemes, to different parts of the traffic. This can enable similar capacity for high resilience traffic as a single resilience level network, and provide additional capacity for lower resilience level traffic, which can reflect the value of the traffic. The allocator can be located centrally in a network manager, or in distributed fashion at each node, and can depend on a translation of a parameter requested by the customer. Nodes have message processors for receiving a message for reserving a path, determining if the path has become unavailable, and if so, sending a second message to collect information about any other paths still available on the same route.
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Citations
29 Claims
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1. Apparatus for use in a transparent wavelength routed optical network having a number of working paths for traffic, and
two or more different optical layer restoration schemes to provide different levels of resilience, the apparatus having: a restoration allocator arranged to allocate a different one of the optical layer restoration schemes, to different parts of the traffic, for use if their working path becomes unavailable. - View Dependent Claims (2, 3, 4, 5, 6, 19, 29)
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7. Apparatus for use in transparent wavelength routed optical network having a number of working paths for traffic, and
two or more different optical layer restoration schemes to provide different levels of resilience, the apparatus having: a restoration controller arranged to cause an allocated one of the restoration schemes to be carried out when the traffic fails on one of the working paths. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 20)
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21. A node for a transparent wavelength routed optical network, the node having:
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an optical switch for routing traffic, and a controller arranged to receive an indication of which of a number of restoration schemes having different resilience levels, is allocated to a given part of the traffic, and to control the optical switch to implement a restoration of the given part of the traffic according to the corresponding scheme, upon receiving a trigger indication.
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22. A method of operating a transparent wavelength routed optical network having a number of working paths for traffic, the method having the steps of:
allocating one of a number of different optical layer restoration schemes to provide different levels of resilience for restoring the traffic in the event of one of the working paths becoming unavailable. - View Dependent Claims (23)
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24. Apparatus for a node of an optical network arranged to set up an end to end path taking a chosen route through the network for traffic, the apparatus having:
a message processor arranged to receive a message originated from another node along the path, the message relating to reserving the path, the part being arranged to determine if the path has become unavailable, and if so, to send a second message to another node along the route to collect information about any other paths that are still available on the same route. - View Dependent Claims (25, 26, 27, 28)
Specification