Abstract: A method for checking a switching center is explained, whereby reference data are checked in the memory of the switching center. On the basis of status data, a processor determines the operational status of programs, which utilize the reference data (step 408). The corresponding reference datum is read for this purpose (steps 410, 416). If the reference datum has a value that is not admissible for the determined operational status, an error treatment is performed (steps 412, 414).

Abstract: A broadcast method for simultaneously switching an announcement to a plurality of subscribers of a communication system is provided. Given announcements that are to be disseminated according to the broadcast method of the invention, a call should be switched such that a subscriber hears the announcement from the beginning. In order to meet this demand, call requests for an announcement are inventively collected and are simultaneously through-connected after the expiration of the collecting time.

Abstract: Seizable connection-associated switching devices emit processing requests for incoming information to a central sequential logic system. Processing requests differ on the basis of different urgency degrees which are defined by type of appertaining, connection-associated switching devices. A limit value is set in an occupation non-acceptance device based on the measure of the momentary sequential logic system load. The processing request are rejected (or accepted) by way of a comparison of the respective urgency value to the limit value which is carried out by way of the occupation non-acceptance device, being rejected (or accepted) when the urgency value is lower (or greater) than the limited value. Connection-associated switching devices having the same urgency degree are combined in different urgency groups having different urgency subvalues on the basis of their addresses.