Abstract: A multi-stage switching-field formed with switching matrices containing thyristors for stored program controlled switching devices, established by reversal at the last stage, without the use of transformers or other reactive elements therein (e.g. capacitance), in the last stage a holding circuit remains invariable upon switching on, furthermore allocating and switching circuits are ordered to the coupling paths instead of the stages. Circuit arrangements of the switching-field provide the possibility for attenuation control too, and do not require voltages of opposite polarity, while at the same time provide an interface requiring uniform, short operations towards the stored program control device. The switching matrices are switched on at minimal power-level, thus the switching of each further coupling path or connection does not increase the noise level of the already existing connections.

Abstract: Subject of the invention is a connection system for the measurement, observation and manipulation of events depending on, or independent from each other taking place in a large number of telephone circuits, furthermore for the preliminary supervision center. The connection system consists of traffic meter unit and efficiency meter connected to the examined circuits and common units of the telephone exchange, furthermore matching and control bus with the connected data processing and data separator unit, as well as data input and output unit connected to the data processing and data separator unit. The output data transfer wires of the traffic meter unit and efficiency meter are connected to the matching and control bus. One input of the traffic meter unit is interconnected with the output of the storage unit of the talking state of efficiency meter.

Abstract: Subject of the invention is a connection system suitable for supervision of large number of telephone circuits based on efficiency measurements.In addition to the holdings the talking state of the circuits is also determined and discounted from the line signals of the examined line connections. The ratio of the holdings and the number of calls is regarded as the efficiency of the circuit. The so-obtained efficiency values are compared to the matrix of the "holding-call" corresponding to the circuit. In case of deviation the circuit is qualified to be faulty.

Abstract: In a DC/DC stabilized voltage converting unit having a series circuit including an input filter, a converter stage having a control input and an output filter, the improvement comprising: a control stage having an output connected to the control input; a voltage regulating circuit receptive of an output of the output filter and having an output applied to the control stage; an anti-overvoltage and anti-overcurrent stage receptive of an output of the converter stage and having an output applied to the control stage; a voltage converter chain coupling circuit for effecting the linking of units in a chain; an internal monitoring and commutating circuit connected between the voltage regulating circuit and the control stage for surveying the outputs of the converter stage; a visually and electrically signalling alarm circuit receptive of the outputs of the output filter and having the outputs thereof applied to the chain coupling circuit; and wherein the chain coupling circuit includes a first input for linking to

Abstract: A data processor for a telecommunication system comprises a program and data memory ME controlled by a block MEV including address registers C1, C2, an address store ACT and an instruction counter US, the memory exchanging information with the components of block MEV and with a set of working registers REG via a reading bus l.sub.rl and a writing bus l.sub.w ; another reading bus l.sub.r2 interlinks some of the aforementioned components. An associated execution unit includes an instruction register U divided into two sections MR and UR receiving instruction words from the writing bus, these words consisting of a group of operand bits fed from section UR to a microprogrammed command-signal generator MV and a group of transformation bits fed from section MR to an address store MC.