| 摘要 |
A signal system 10 for a vessel such as an aircraft, incorporates nodes 16A, B, C arranged in a hierarchy. Low level nodes 16C are associated with plant 14 of the aircraft. Mid-level nodes 16B can communicate with groups of low level nodes 16C, grouped by proximity. A top level node 16A can communicate with all mid-level nodes 16B.Decision making capability is built into nodes 16, to allow decisions to be taken at the lowest hierarchical level at which all of the necessary information is available.
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