PURPOSE:To reduce a fault report from a subscriber after establishment of a station, by testing the normalcy of the connection of a subscriber's line to a replacing electronic exchange and an existing exchange, and testing the normalcy of subscribers data in the replacing electronic exchange. CONSTITUTION:A connection between an existing exchange 2 and a subscriber pseudo transmitter SPT14 is performed by operating a relay contact 132 for all subscribers at a subscriber circuit 13 in a newly established electronic exchange 1, and operating a relay contact 133 at the subscriber circuit 13 corresponding to a subscriber number to be tested, after the completion of the connecting work of the subscriber's line in a main wiring board 3. The existing exchange 2 sends out an outgoing subscriber number corresponding to a generated outgoing connection call to the newly established electronic exchange 1. By checking the subscriber number received by the newly established electronic exchange 1 with the number to be tested, the test for the normalcy of the subscriber's line in the main wiring board 3 can be performed.
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