PURPOSE: To provide the electronic exchange, which can facilitate fault analysis and can easily separate a fault by collecting the signal information of in and out trunks in the state of on-line and real-time, concerning the electronic exchange equipped with a signal information storage device for storing the signal information of in and out trunks.

CONSTITUTION: Concerning an electronic exchange 100 provided with a network 10, central processing unit 20, signal distributor 21, main storage device 22, in trunk 30 and out trunk 40, this device is equipped with a signal information collector 200 for collecting the signal information of in and out trunks 30 and 40, and input/output device 210 for designating the in trunk 30 and the out trunk 40 to collect the signal information with the signal information collector 200, and the signal information of the in trunk 30 and out trunk 40 designated by the input/output device 210 is collected in the on-line and real-time state at the signal information collector 200.