Error Correction Mode (ECM) is a T.30 recommendation that provides more efficient error handling for noisy or distorted fax transmissions. It enables the receiver to check for and request retransmission of garbled data.
The Error Correction Mode (ECM) switch allows you to explicitly enable ECM T.30 protocol for a fax transmission. The use of ECM for a fax transmission is determined during Phase B negotiations and is based on the capabilities of the receiving station (remote station).
The encoding scheme in which the data is presented for transmission does not determine the phone line encoding scheme for data transmission. Rather, during Phase B negotiations, the FC_TXCODING fax parameter values (fx_setparm( ) function) and the receiving station's capabilities determine the phone line encoding scheme, and whether to use ECM.
MMR line encoding always requires the use of ECM.
For more information on setting the ECM switch, see fx_setparm( ) in Chapter 9. Fax Library Function Reference.
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