Brother FAX-8650P - Manual (Page 135)

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l Selector 4: Stepping Down the Transmission Speed at Fallback Each
This selector determines how much the modem steps down the transmission speed at fallback
when called by the remote station. If this selector is set to "1," the modem may step down the
transmission speed from 33600 bps to 28800 bps by one-time fallback.
l Selectors 5 and 6: Automatic Control of modem's EQM Gain for Proper Transmission Speed Choice
These selectors determine how the modem controls the EQM (Eye Quality Monitor) gain for proper
choice of the transmission speed, which applies if the modem selects higher transmission speed
than the possible speed so that it always repeats falling back.