| 摘要 |
A functional entity in a digital switch (102) is triplicated in planes operating in parallel. From each plane a respective passing data flow is spread to each of the planes in parallel therewith. A majority vote function (502) receives the data flows of the own plane and the planes in parallel therewith, and compares these on a bit level for creating a majority voted data flow (DATAMV). A plane condition sensing function (514) indicates whether links of the planes (A, B, C) have meaningful information and synchornism, and emits, as a result, a link condition indicating signal (INSYAI, INSYBI, INSYCI) for each plane forming an indication thereof. A priority select function (506) is connected for receiving the majority voted data flow (DATAMV) 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 (DATAMV) through as an outgoing data flow (DATAOUT) 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 (DATAOUT) based upon an established priority order. |
