Abstract: In a telecommunication system, especially a telephone system having at least one electronic computer controlled telephone exchange, in its turn having time-space type switches, including a number of memory devices in the form of matrices, a method and an apparatus for transferring, via inputs and outputs of the memory devices, speech and data information in binary form between subscribers connected to the exchange. To considerably reduce the power consumption of the memory matrix as a whole, devices are provided to activate only those memories, which, for the moment, are intended to emit a corresponding output signal after that data has been written into same, and to cut off those portions of the memory matrix, which are not used for emitting output signals, in that no information is written into those, thus, not activated memories.

Abstract: A method and device for detecting errors in a digital time switch that does not require the signal to be synchronous throughout a multi-plane processing unit in a digital time switch. The present invention allows for the detection and localization of errors occurring in one section of one plane in a multi-plane unit. The invention is preferably included in a telecommunications system operating with pulse code modulation and time multiplex. In a multi-plane portion of a digital time switch, there is generated for each one of corresponding parallel planes at corresponding locations a compressed version of the data signal and the corresponding compressed data signals are compared. An alarm is given when the comparison shows a difference between the compressed signals.