ECM is an error correction mode defined by ITU-T (International Telecommunication Union - Telecommunication Standardization Sector).
Fax machines that support the ECM communicate while confirming that there is no error in the sent data. This prevents image blurring caused by noise on the phone line.
By default, this machine uses ECM for transmission. If the noise level is high, the communication may take a little longer than the communication without using ECM checking. To reduce the transmission time, you can transmit faxes with ECM turned off.
Transmission begins.