| 摘要 |
A functional entity in a digital switch is triplicated in planes operating in parallel. From each plane, a respective passing data flow is spread to parallel planes. A majority vote function receives the data flows of the planes and compares these on a bit level for creating a majority voted data flow. A plane condition sensing function indicates whether links of the planes have meaningful information and synchronism, and emits, as a result, a link condition indicating signal for each plane. A priority select function is connected for receiving the majority voted data flow and the link condition indicating signals. If the link condition indicating signals indicate a fault condition, the priority select function lets the majority voted data flow through as an outgoing data flow from the functional entity. In case a fault condition is indicated in one or more of the link condition indicating signals, the priority select function selects the data flow from one of the planes as an outgoing dataflow based upon an established priority order. |
