Method and apparatus for remote testing of optical cables using a test wavelength

摘要

A communications network (10) is described comprising a cable (13) and a remote test unit (15) being coupled to the cable (13). Optical data signals are transmitted with a first wavelength ( lambda 1) on the cable (13). The remote test unit (15) is adapted to transmit optical test signals as well as optical result messages with a second wavelength ( lambda 2) to the cable (13).