Error correction mode (ECM) is an optional built into Class 1/2/2.0 or . ECM automatically detects and corrects in the fax transmission process that are sometimes caused by . The page data is divided into what is known as Octets (small ). Once the has received all the Octets it examines them (using ) and then advises the transmitting fax of any Octets that are in error. The transmitter then need only resend the blocks in error rather than the whole page. This generally means an ECM coded fax will be more likely to succeed on a noisy line. ECM is the norm rather than the exception. Some fax machines have the capability to enable or disable this function.

Source

http://wikipedia.org/

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