Efficiency factor
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Efficiency factor: In data communications, the ratio of (a) the time to transmit a text automatically at a specified modulation rate to (b) the time actually required to receive the same text at a specified maximum error rate.
All of the communication facilities are assumed to be in the normal condition of adjustment and operation.
Telegraph communications may have different temporal efficiency factors for the two directions of transmission.
The practical conditions of measurement should be specified, especially the duration of the measurement.