US Patent 7409618 Self verifying communications testing

A system and method for testing a device with multiple interfaces by generating a predetermined data pattern within the device, transmitting the pattern to a test analyzer, generating a second predetermined data pattern within the test analyzer, and simultaneously transmitting the second test pattern to the device where the second test pattern is verified. The first and second test patterns may be the same or different, depending on the application. Further, the transmit and receive paths may be tested separately and independently in addition to simultaneously.