The FTB-7600E OTDR: for powerful ultra-long-haul testing. High-end fiber characterization and submarine cable testing. Characterize fiber with maximum accuracy over distances of more than 200 km. With a dynamic range of up to 50.5 dB and unmatched linearity (b10.03 dB/dB), the FTB-7600E accurately locates faults on ultra-long links without compromising resolution. Offered in single and dual-wavelength configurations (1310/1550/1625 nm).