Agilent Technologies N4900 Series Agilent offers a wide range of serial bit error ratio test (BERT) solutions for R&D and manufacturing. The J-BERT N4903B high- performance serial BERT is the flagship of Agilent’s N4900 serial BERT series. It addresses the needs of R&D and validation teams who characterize serial I/O ports or ASICs up to 14.2 Gb/s. Integrated and calibrated jitter sources for jitter tolerance measure- ments also allow designers to characterize and prove compliance of their receiver’s jitter tolerance. The B version of the J-BERT has been improved to address the test needs during characterization and compliance test of emerging forwarded clock and embedded clock devices in the most complete and integrated way.