Portable and remote multi-path communication device bit error rate testing device and method

The invention discloses a portable and remote multi-path communication device bit error rate testing device and method. The device comprises a high-speed serial interface expansion board, a parallel interface expansion board, a clock generator, a collection controller, a USB extension cord and a remote terminal; connection ways of the tested device and the device comprise remote connection and short connection; the device produces pseudo-random sequence code seed in various modes as a mode code, the mode comparison is performed on the mode code and the tested sequence produced by the tested device, thereby finding out the sequence consistent with the mode code after the comparison with the section of sequence; the mode code produces the subsequent corresponding sequence according to the consistent sequence, and the bit-wise comparison is performed on the subsequent corresponding sequence and the tested sequence, thereby realizing the error detection. The device disclosed by the invention can be used for vario