DEVICE FOR PRODUCTION OF SWITCHING ORDER INFORMATION FOR TRANSMISSION OF PCM WORDS

摘要

A PCM exchange comprising a space stage arranged between time stages is provided with signal receivers and switching order units connected to the space stage. The signal receivers receive signal words each associated with one of the PCM channels transferred on highways through the space stage, for comparison with corresponding signal words previously stored in a state information memory. Upon deviation in the comparison computer of known type computes by means of the signal words switching order information which defines the incoming and outgoing PCM channels for a communication path through the exchange. A control logic selects one of the switching order units and transfers to it the computed switching order information. The switching order unit detects a free time slot for the path through the space stage and the complete switching order information including even the free time slot is transferred not only to switching order memories in the time stages but also to the state information memory. For disconnecting a path, the control logic feeds disconnecting information defining both the time slot and the incoming highway used during the connection to the switching order unit selected for the connection. Through the aid of the disconnecting information the corresponding switching order and state information memories are zero-set.