Cisco Dispersion Compensation Unit provides compensation for accumulated chromatic dispersion effect in line and terminal sites of optical telecommunications systems. It provides a flexible solution to the problem of accumulated chromatic dispersion without having to drop and regenerate the wavelengths on the link, which would otherwise be necessary when accumulated chromatic dispersion exceeds the maximum allowed dispersion tolerance.This DCU provides L-Band wavelength, E-LEAF fiber type, negative effect and 900ps/nm Compensation Level.