| 摘要 |
A T-S-T 3-staged structure switching network control system in a digital switching system which avoids an entire switching system malfunction even a failure occurred in a space switch module, and guarantees a connection within a time switch module is realized for providing the switching system capable of improving its reliability. In each time switch module including a first stage time switch and a third stage time switch with their control processor, a selecting circuit is provided in front of an input of the third time switch for selectively connecting a junctor highway which is connected to an output of a second stage space switch in a space switch module or a highway which is connected to an input of the first stage time switch to the input of said third time switch. The control processor in each time switch module controls the selecting circuit to connect the highway to the input of the third stage time switch in the case that the space switch module is a faulty condition.
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