Send Start Speed
This mode enables you to change the send start speed. This is useful when there is difficulty initiating the sending of a document.
If you are using the imageRUNNER ADVANCE C350i/C250i, this mode can be set when the Fax function is available for use. For information on the optional products required to use the Fax function, see "Optional Products Required for Each Function."
1.
Press 
(Settings/Registration).
(Settings/Registration).2.
Press [Function Settings] → [Send] → [Fax Settings].
3.
Press [TX Start Speed].
4.
Select the desired start speed → press [OK].
If your document transmission is slow in starting, this may mean that the telephone lines in your area are in poor condition. Select a slower speed. You can select [33600 bps], [14400 bps], [9600 bps], [7200 bps], [4800 bps], or [2400 bps].