An extended method for on-line transfer function measurement of cable systems with discontinuities was validated under conditions close to practice. The method allowed to precisely synthesize measured impulse responses of a test cable system. It furthermore allowed to estimate the spectral characteristics of single components, such as the transfer function of one specific cable or the reflection coefficient of one specific joint. Due to these and other advantages, which are of particular interest for a convenient and cost-effective application in the field, the proposed method could be a powerful tool for global and local condition monitoring of cable systems.