Patent ID: 7821271

Claim:
Method for testing a communication connection ( 1 ) in a communication network in an aircraft with at least a first controller ( 7 ), a second controller ( 8 ) and a third ( 9 ) controller, comprising the steps: generation ( 14 ) of a first predefined signal, output ( 15 ) of the first signal at a predefined output (x) of the first controller ( 7 ) and sending ( 16 ) of the first signal to the third controller ( 9 ) by the first controller ( 7 ); detection ( 17 ) of a first incoming signal at a predefined input (y) of the second controller ( 8 ) which is connected via the communication connection ( 1 ) to the predefined output (x) of the first controller ( 7 ), and sending ( 18 ) of the incoming signal to the third controller ( 9 ) by the second controller ( 8 ); comparison ( 19 ) of the first predefined signal with the first incoming signal by the third controller ( 9 ) and generation ( 21 ) of a first identicalness signal if the first predefined signal and the first incoming signal are the same; repetition ( 22 ) of the steps with a second predefined signal and generation of a second identicalness signal by the third controller ( 9 ) if the second predefined signal and a second incoming signal are the same; output ( 26 ) of an enabling signal if the first and the second identicalness signal have been generated.