Oki OKIOFFICE 84 Service Manual page 95

21 Modem attenuator
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Adjusts the attenuation (dB) for the message send
signal power level.
Adjusting value is 0 to 15 dB in one dB steps.
Since the maximum send signal power level (dB)
of the fax is at 0 dB, you can select 0 dB to -15 dB
in one dB steps for the send signal power level.
0 to 15 dB. selectable