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US 7,023,842 B2Granted
Switch model component
AssigneeNortel Networks Limited
InventorsMark Carson, Andrew Brown
Life of this patent
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AssigneeNortel Networks Limited
InventorsMark Carson, Andrew Brown
Estimating the term…
One aspect of the invention provides an apparatus for modelling a plurality of switching operations arranged in a plurality of switching stages. The apparatus comprises a respective switch stage component for each switching stage, and each switch stage component comprises a respective addressable switch state indicator for each switching operation associated with the respective switching stage. The values of the switch state indicators in a given switch stage component identify a respective switch state indicator in another switch stage component. The switch stage components are interconnected such that addressing a switch state indicator in one switch stage component causes the respective identified switch state indicator in another switch stage component to be addressed. In the preferred embodiment, each switch stage component comprises a respective Look-Up Table.
An apparatus for modelling a plurality of switching operations arranged in a plurality of switching stages, the apparatus comprising at least one respective switch stage component for each switching stage, each switch stage component comprising one or more respective addressable switch state indicators for each switching operation associated with the respective switching stage, wherein the value of each of said switch state indicators in one or more of said switch stage components identifies a respective switch state indicator in another switch stage component and wherein the switch stage components are interconnected such that addressing a switch state indicator in one switch stage component causes the respective identified switch state indicator to be addressed.
A method of modelling a plurality of switching operations arranged in a plurality of switching stages using an apparatus comprising a respective switch stage component for each switching stage, each switch stage component comprising a respective addressable switch state indicator for each switching operation associated with the respective switching stage, the method comprising addressing a switch state indicator in one of said switch stage components and using the value of the addressed switch state indicator to address a switch state indicator in another switch stage component.
A method of protection switching using an apparatus for modelling a plurality of switching operations arranged in a plurality of switching stages comprising a respective switch stage component for each switching stage, each switch stage component comprising a respective addressable switch state indicator for each switching operation associated with the respective switching stage, the method comprising addressing a switch state indicator in one of said switch stage components and using the value of the addressed switch state indicator to address a switch state indicator in another switch stage component.
Dependencies are inferred from the claim text.