Device for production of switching order information for transmission of pcm words

Claim 1

Apparatus for producing in switching order units switching order information for the connection and disconnection of communication paths in an exchange which receives PCM words in a time division multiplex configuration comprising a first time stage, a space stage and a second time stage, through which the PCM words and digital signal words for information relating to a switching order are transmitted, means for transmitting each word during a time slot via files from the first time stage to the space stage, means for transmitting the PCM words from the space stage to the second time stage, means for transmitting the PCM words from the second time stage in said time division multiplex configuration, the space stage being divided into a number of file contact planes, each of which has its incoming and outgoing files connected to a respective substage in the first and second time stage respectively, each of the substages including switching order memories and being connected to links associated with the respective substage of the links incoming to and outgoing from the exchange, so that the number of space stage file contact planes corresponds to the number of files outgoing from and incoming to any time substage whatsoever, and each of said space stage planes including outgoing detecting files and an incoming transfer file which connect the plane to one of said switching order units in order, on the basis of a switching order information, to detect a time slot free for connection and to transfer the switching order information to the switching order memories, characterized in that the device comprises a computer, a state memory for storage of state information relating to each of the communication paths, a number of signal receivers which are connected to files outgoing from the space stage, means including file gates operative in specific time slots for transmission of signal words for switching said signal receivers to incoming files of the space stage for the reception of said signal words, each of said signal receivers being associated with one PCM channel of the incoming channels to the exchange, means for comparing the signal word obtained with the signal word stored in the state memory for the incoming channel and, in the event of deviation, for transferring the stored state information and the last received signal word to said computer said computer including means which, in dependence on the state data received computes a switching order information for connection or disconnection of a communication path, a switching order register for storage of the information computed by the computer, a control logic means which, for connecting a path, includes means for selecting one of said switching order units in order to transfer from the switching order register to switching order units information defining the incoming and outgoing channels between which a path is to be connected, and said control logic means, for disconnecting of a path, includes means for feeding information defining the time slot and the substage to the first time stage used during the connection to the switching order unit selected for the connection, and said control logic means, for connecting of a path, includes means for feeding information relating to the free time slot detected for the connection from said switching order unit to the switching order register and, both for connecting and disconnecting, includes means for transmitting the contents of the switching order register to said stage memory.