| 摘要 |
A communications switch comprising a plurality of numerically identified input traffic ports, a plurality of numerically identified output traffic ports, at least one significant label extractor and at least one numerical processor, the communications switch being arranged whereby each message entering the communication switch by a numerically identified input traffic port contains a header, which header contains a label stack, which label stack includes at least one valid label, of which one valid label is a significant label. The numerical value of the significant label contained within the header of a particular message which entered the communications switch via a particular numerically identified input traffic port is extracted by the at least one significant label extractor and is supplied to one of the at least one numerical processors. The numerical processor uses the significant label of the particular message and the numerical value of the particular numerically identified input traffic port to form a numerical result which directly equates to the number of the numerically identified output traffic port by which the particular message leaves the communications switch and wherein the numerical result is equal to the modulo addition of the numerical value of the significant label and the numerical value of the particular numerically identified input traffic port.
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