Noise in the phone line, or a low signal strength during fax transmission can result in intermittent fax failures. Noise or poor signal strength can cause all, or part of the fax information to be lost during transmission. When the Error correction mode is turned on, the receiving fax checks the fax information for errors during reception. If an error is detected, the receiving fax would request that the sending fax resend all, or part of the fax information. Sending all or part of the information again would make the transmission time longer, but would make sure that the quality of the received fax is good. If the phone line quality or signal strength is poor, too many errors can occur, and the fax transmission can fail.