Failure protection switching in optical network
First Claim
1. A method of effecting failure protection switching in an optical network, the optical network comprising a ring structure carrying a bi-directional optical data signal, and a plurality of network hubs arranged in-line within the ring structure, each network hub being arranged, in use, to transmit and receive signals bi-directionally along the ring structure, the method comprising the steps of:
- a) detecting a “
no signal”
at a primary pre-amplifier located at one of the network hubs and arranged to pre-amplify a primary optical signal received from a first direction along the ring structure;
b) shutting down the primary pre-amplifier and powering up a secondary pre-amplifier located at the one network hub and arranged to pre-amplify a redundant optical signal corresponding to the optical signal and received from the opposing direction along the ring structure.
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Accused Products
Abstract
A method of effecting failure protection switching in an optical network, the optical network comprising a ring structure carrying a bi-directional optical data signal, and a plurality of network hubs arranged in-line within the ring structure, each network hub being arranged, in use, to transmit and receive signals bi-directionally along the ring structure, the method comprising the steps of a) detecting a “no signal” at a primary pre-amplifier located at one of the network hubs and arranged to pre-amplify a primary optical signal received from a first direction along the ring structure b) shutting down the primary pre-amplifier and powering up a secondary pre-amplifier located at the one network hub and arranged to pre-amplify a redundant optical signal corresponding to the optical signal and received from the opposing direction along the ring structure.
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Citations
27 Claims
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1. A method of effecting failure protection switching in an optical network, the optical network comprising a ring structure carrying a bi-directional optical data signal, and a plurality of network hubs arranged in-line within the ring structure, each network hub being arranged, in use, to transmit and receive signals bi-directionally along the ring structure, the method comprising the steps of:
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a) detecting a “
no signal”
at a primary pre-amplifier located at one of the network hubs and arranged to pre-amplify a primary optical signal received from a first direction along the ring structure;
b) shutting down the primary pre-amplifier and powering up a secondary pre-amplifier located at the one network hub and arranged to pre-amplify a redundant optical signal corresponding to the optical signal and received from the opposing direction along the ring structure. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An optical network comprising a ring structure carrying a bi-directional optical data signal and a plurality of network hubs arranged in-line within the ring structure, each network hub being arranged, in use, to transmit and receive signals bi-directionally along the ring structure, the network being arranged in a manner such that:
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upon detection of a “
no signal”
at a primary pre-amplifier located at one of the network hubs and arranged to pre-amplify a primary optical signal received from a first direction along the ring structure;
the primary pre-amplifier is being shut down anda secondary pre-amplifier located at the other side of the specified network hub and arranged to pre-amplify a redundant optical signal corresponding to the primary optical signal and received from the opposing direction along the ring structure is being powered up. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A network hub for use in an optical network, the optical network comprising a ring structure carrying a bi-directional optical data signal and a plurality of network hubs arranged in-line within the ring structure, the network hub being arranged, in use, to transmit and receive signals bi-directionally along the ring structure, and the network hub comprising:
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a primary pre-amplifier arranged to pre-amplify a primary optical signal received from a first direction along the ring structure and a secondary pre-amplifier arranged to pre-amplify a redundant optical signal corresponding to the primary optical signal and received from the opposing direction along the ring structure, wherein the network hub is arranged, in use upon detection of a “
no signal”
at the primary pre-amplifier, to shut down the primary pre-amplifier and to power up the secondary pre-amplifier. - View Dependent Claims (22, 23, 24, 25, 26, 27)
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Specification