The 25 Gb/s BER test set comprises a signal generator that drives an passive current board including micro-strip line (R6C) through Gennum GN2426A IC and SEMTECH GN2426A chip generated with a Pseudo Random Binary Sequence (PRBS) of digital 1’s and 0’s, representing a random data stream. The simple 25 Gb/s testing of passive current board converts the PRBS data stream from electrical to optical components. The R6C’s price for 25 Gb/s passive current board of a PRBS generator is almost 1/400 times than the measuring equipment price. R6C board is a structure for four layers. Its feature of eye diagram is a jitter of 12.614 ps, a bit rate of 25.35 Gb/s, a fall time of 14.5 ps and a rise time of 12.5 ps. R6C has a useful role under mass production. It is very cheap and simple high speed testing for 25 Gb/s.