Abstract: Different conditions of a module are indicated by means of at least one visual indicator element, for instance in the form of a light emitting diode, mounted visibly on the module. Pressing a repair key initiates a repair condition, in which the actions and control procedures necessary for taking the faulty module out of service are carried out, and also causes a newly inserted module in a module frame to be automatically recognized, prompts a test function and causes the new module to be automatically put into service upon passing a test procedure.

Abstract: In a telecommunications exchange system, consisting of a central section comprising a central switching network and a central coordination processor, and consisting of line trunk groups which are connected to the switching network via allocatable connection paths and which each comprise a subsidiary switching network and a subsidiary control unit, between the coordination processor on the one hand and each of the subsidiary control units on the other hand, a control channel exists via which the former at all times has access to each of the latter. With the start-up of an entire exchange system or only of individual line trunk groups, the coordination processor loads the subsidiary control units with items of switching orientated program information and with items of connection state data individually assigned to the individual subsidiary switching network terminals, which can consist of subscriber terminals and connection line terminals.

Abstract: A circuit arrangement for connection of information transducers, which may be compensating networks in program controlled telecommunication exchange systems is described. In the system the transfer of information between the feeder and consumer lines connected to a line connection unit always occurs over a central memory. The storage areas in the central memory, which are connected to feeder lines, can be reached over input code transducers and contain an address datum identifying the desired outgoing or consumer lines. By means of the address datum, the consumer lines can be reached over output code transducers. Compensating networks are connected at the input end to the outputs of the output code transducer and at the output end to inputs of the input code transducer. Applicable outputs of the output code transducer can be reached over an address datum contained in an associated storage area. Specific storage areas connected to applicable inputs of the input code transducer can be reached over these inputs.