| 摘要 |
A method of counting transmission errors in a digital microwave link with a demand of commutation onto an emergency channel when the quality of the link becomes deficient, wherein the errors are counted during a period t which is always at least equal to a value t1 and at the most equal to a value t2, and which terminates when a fixed number N of errors has been detected, a pulse is stored upon each detection of N errors within a period t, and commutation is requested when n1 pulses have been stored consecutively.
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