The invention relates to a method, a testing arrangement, a testing device, an 8B/10B encoder and an 8B/10B decoder, with which the recovery from a 8B/10B encoding error of a device using serial data transmission may be tested. The 8B/10B encoder ( 302 ) according to the invention in a transmitting device ( 30 ) may create code words unspecified in the ANSI INCITS 203-1994 standard for testing. The 8B/10B decoder ( 312 ) in a receiving device ( 31 ) is able to indicate having converted a code word unspecified in the ANSI INCITS 203-1994 standard and having entered a testing mode. The testing device ( 33 ) connected to the receiving device commences monitoring of the receiving device ( 31 ), when the 8B/10B decoder ( 312 ) pertaining to it indicates the system having entered the testing mode.
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