Optical wavekey network and a method for distributing management information therein
First Claim
1. A wavekey network comprising:
- a network controller;
a plurality of nodes, each node communicating with said network controller through a management link connecting a selected node, among said plurality of nodes, to said network controller, said each node comprising;
a node controller;
a respective plurality of access ports; and
a respective plurality of inter-nodal interfaces;
anda plurality of links, each link connecting inter-nodal interfaces of a respective node pair and supporting optical signals occupying channels of different wavelength bands, said channels comprising;
a control channel carrying control signals; and
data channels, each data channel carrying data of a respective connection from an access port of a source node to an access port of a destination node, said each data channel further modulated by a respective wavekey of at least one dither tone;
said node controller configured to communicate nodal information to said network controller, said nodal information comprising, for each data channel of each link emanating from said each node;
an identifier of a connection traversing said each data channel;
an identifier of a central wavelength of said each data channel; and
an identifier of a current wavekey modulating said central wavelength; and
said network controller configured to determine continuity of said connection according to nodal information received from all nodes of said plurality of nodes.
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Accused Products
Abstract
Optical link related wavekey information and other vendor specific information is distributed in a WDM network using an extension of the standard OSPF routing protocol. The extension makes use of a vendor attribute Link State Advertisement (LSA) which is a new type of opaque LSA. The vendor attribute LSAs include a Vendatt Link State Identifier (ID) field in the LSA header, and a Vendatt Type/Length/Value (TLV) structure. The Vendatt TLV includes a Vendatt-type field identifying the TLV as a Vendatt TLV, and an enterprise code field identifying the vendor whose equipment (node or network element) generates vendor attribute LSAs or is able to receive vendor attribute LSAs by the identified vendor. Vendor attribute LSAs of a specific vendor are designed to be ignored by nodes or network elements of other vendors.
14 Citations
20 Claims
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1. A wavekey network comprising:
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a network controller; a plurality of nodes, each node communicating with said network controller through a management link connecting a selected node, among said plurality of nodes, to said network controller, said each node comprising; a node controller; a respective plurality of access ports; and a respective plurality of inter-nodal interfaces; and a plurality of links, each link connecting inter-nodal interfaces of a respective node pair and supporting optical signals occupying channels of different wavelength bands, said channels comprising; a control channel carrying control signals; and data channels, each data channel carrying data of a respective connection from an access port of a source node to an access port of a destination node, said each data channel further modulated by a respective wavekey of at least one dither tone; said node controller configured to communicate nodal information to said network controller, said nodal information comprising, for each data channel of each link emanating from said each node; an identifier of a connection traversing said each data channel; an identifier of a central wavelength of said each data channel; and an identifier of a current wavekey modulating said central wavelength; and said network controller configured to determine continuity of said connection according to nodal information received from all nodes of said plurality of nodes. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of verifying continuity of paths in a wavekey network comprising a plurality of nodes interconnected through a plurality of multi-channel links, each node having a node controller, the method comprising:
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providing a link interface for each multi-channel link among said plurality of multi-channel links; sending optical signals occupying channels of different wavelength bands of said each multi-channel link, said optical signals comprising control signals occupying a control channel and data signals occupying data channels of said each multi-channel link; sending, over each data channel of said each multi-channel link, data of a respective connection originating from an access port of a source node and terminating at an access port of a destination node; modulating said each data channel by a respective wavekey of at least one dither tone; distributing, by said node controller, nodal information to each other node, said nodal information comprising; an identifier of a respective connection traversing each data channel of each link emanating from said each node; an identifier of a central wavelength of said each data channel; and an identifier of a current wavekey modulating said central wavelength; and communicating to a network controller, from a gateway node selected from among said plurality of nodes, nodal information pertinent to said each node to enable said network controller to determine continuity of said respective connection. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A node in a wavekey network, said node comprising:
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a node controller; a plurality of access ports; and a plurality of link interfaces, each link interface coupled to a link to another node of said wavekey network, said link supporting optical signals occupying channels of different wavelength bands, said channels comprising; a control channel carrying control signals; and data channels, each data channel carrying data of a respective connection originating from an access port of a source node and terminating at an access port of a destination node, said each data channel further modulated by a respective wavekey of at least one dither tone; said node controller configured to communicate nodal information through said control channel, said nodal information comprising, for each data channel of said link; an identifier of a connection traversing said each data channel; an identifier of a central wavelength of said each data channel; and an identifier of a current wavekey modulating said central wavelength. - View Dependent Claims (17, 18, 19, 20)
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Specification