| 摘要 |
A multistage switch has an MxN switch size selectively connecting M incoming lines and N outgoing lines and consists of S stages of discrete switches each having a switch unit, wherein the discrete switches are permanently cross-connected in accordance with a prescribed rule. Stored connection information regarding the overall multistage switch and the states of connection of the switch units of the discrete switches are retrieved. Then, utilizing the fact that an output terminal of a switch in a cth (where c</=S-1) stage of the multistage switch is to be logically connected to an input terminal of a switch in a (c+1)th stage, connection information relating to the overall switch is generated from the results of retrieval. The generated connection information relating to the overall multistage switch is compared with connection information that has been stored in memory in advance, whereby a connection path that has been set for each discrete switch is prevented from being severed accidentally.
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