Apparatus and Method For Optical Transport Networks
First Claim
1. A method for providing bidirectional protection switching in an optical transport network, the optical transport network comprising a first node and a second node adapted to communicate one or more lower order optical channel data unit (LO-ODU) traffic signals via a higher order optical channel data unit (HO-ODU) traffic signal, the method comprising:
- modifying an adaptation function between a lower order optical channel data unit (LO-ODU) traffic signal and a higher order optical channel data unit (HO-ODU) traffic signal to enable protocol information for bidirectional protection switching to be conveyed in the respective one or more lower order optical channel data unit (LO-ODU) traffic signals; and
using the protocol information to perform bidirectional protection switching.
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Abstract
An optical transport network comprises a first node and a second node adapted to communicate one or more lower order optical channel data unit (LO-ODU) traffic signals via a higher order optical channel data unit (HO-ODU) traffic signal. An adaptation function between a lower order optical channel data unit traffic signal and a higher order optical channel data unit traffic signal is modified to enable protocol information for bidirectional protection switching to be conveyed in one or more lower order optical channel data unit traffic signals that are conveyed between the first node and the second node using the higher order optical channel data unit traffic signal. This enables the protocol information to be used at a higher order optical channel data unit entity to perform bidirectional protection switching.
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Citations
20 Claims
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1. A method for providing bidirectional protection switching in an optical transport network, the optical transport network comprising a first node and a second node adapted to communicate one or more lower order optical channel data unit (LO-ODU) traffic signals via a higher order optical channel data unit (HO-ODU) traffic signal, the method comprising:
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modifying an adaptation function between a lower order optical channel data unit (LO-ODU) traffic signal and a higher order optical channel data unit (HO-ODU) traffic signal to enable protocol information for bidirectional protection switching to be conveyed in the respective one or more lower order optical channel data unit (LO-ODU) traffic signals; and using the protocol information to perform bidirectional protection switching. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An optical transport network for providing bidirectional subnetwork connection protection switching, the network comprising:
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a first node and a second node adapted to communicate one or more lower order optical channel data unit (LO-ODU) traffic signals via a higher order optical channel data unit (HO-ODU) traffic signal; and a processor adapted to modify an adaptation function between a lower order optical channel data unit (LO-ODU) traffic signal and the higher order optical channel data unit (HO-ODU) traffic signal to enable protocol information for bidirectional protection switching to be conveyed in the respective one or more lower order optical channel data unit traffic signals. - View Dependent Claims (9, 10)
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11. A node for use in an optical transport network, the node comprising:
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one or more input interface for receiving one or more lower order optical channel data unit traffic signals; an output interface for outputting a higher order optical channel data unit traffic signal; a multiplexer adapted to multiplex the one or more lower order optical channel data traffic signals into the higher order optical channel data unit traffic signal; and a processor adapted to control the operation of the multiplexer, such that protocol information for bidirectional protection switching is mapped into a respective header portion of the one or more lower order optical channel data unit traffic signals. - View Dependent Claims (12)
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13. A method in a node of an optical transport network, the method comprising:
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receiving one or more lower order optical channel data unit (LO-ODU) traffic signals; multiplexing the one or more lower order optical channel data (LO-ODU) traffic signals into a higher order optical channel data unit (HO-ODU) traffic signal; and outputting the higher order optical channel data unit (HO-ODU) traffic signal, wherein the multiplexing step comprises mapping protocol information for bidirectional protection switching into a respective header portion of the one or more lower order optical channel data unit (LO-ODU) traffic signals. - View Dependent Claims (14)
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15. A node for use in an optical transport network, the node comprising:
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an input interface for receiving a higher order optical channel data unit traffic signal, which comprises one or more lower order optical channel data unit (LO-ODU) traffic signals; one or more output interface for outputting one or more lower order optical channel data unit traffic signals; a demultiplexer adapted to demultiplex the one or more traffic signals from the higher order optical channel data unit traffic signal; and a processor adapted to control the operation of the demultiplexer, such that protocol information for bidirectional protection switching is unmapped from a respective header portion of the one or more lower order optical channel data unit traffic signals. - View Dependent Claims (16)
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17. A method in a node of an optical transport network, the method comprising:
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receiving a higher order optical channel data unit traffic signal, which comprises one or more lower order optical channel data unit (LO-ODU) traffic signals; demultiplexing the one or more lower order optical channel data unit (LO-ODU) traffic signals from the higher order optical channel data unit (HO-ODU) traffic signal; and outputting one or more lower order optical channel data unit traffic signals, wherein the demultiplexing step comprises unmapping protocol information for bidirectional protection switching from a respective header portion of the one or more lower order optical channel data unit (LO-ODU) traffic signals. - View Dependent Claims (18, 19, 20)
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Specification