Telephone exchange cct. with fault localisation - has representational display of coupling field fed from crosspoint store

摘要

The telephone exchange circuit comprises a multi-stage coupling field, a storage register (b), and means for fault localisation, operating by evaluating the coupling selection data. By setting up a coupling without errors occurring the coupling field parameters, relating to this coupling and to other existing couplings for tangential coupling field intersections are supplied to a store, representing the coupling field parameters are supplied for a given time period, being displayed. The store and the storage register are both connected to the path selection circuit and the outputs of both are connected to an alarm device.