IEC/TR 61282-13:2014 which is a technical report, presents general information about in-service measurements of polarization mode dispersion (PMD) and chromatic dispersion (CD) in fibre optic links. It describes the background and need for these measurements, the various methods and techniques developed thus far, and their possible implementations for practical applications. Key words: polarization mode dispersion (PMD), chromatic dispersion (CD), fibre optic links