When the sub-card is inserted into the backboard (20), the interface system (10) not only detects whether the sub-card is correctly installed into place, but also further detects the code of the chassis with the backboard (20) into which the sub-card is inserted and the code of the slot position being inserted, and confirms the present working environment of the sub-card, thus comprehensively detecting the connection status between the sub-card and the backboard (20), and ensuring the reliable connection between the sub-card and the backboard (20).
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