TEST SYSTEM FOR INCOMING AND OUTGOING CALL

PURPOSE:To test the operation of a network controller only at the terminal side, by connecting a test device to the network controller connected to a subscriber telephone line, and collating a transmitted data with a folded over data at a test station by means of the test device. CONSTITUTION:A test device 8 transmits telephone number information to an automatic dial circuit 52 of the network controller 5 from a code number input circuit 81. A circuit 53 transmits a dial signal. When the test station responds to the all of an exchange based on this dial signal, the device 8 transmits a data A representing the device 8 from a code number input circuit 81. When the test station receives the data A, this is transmitted with fold back. The data collation circuit 84 of the device 8 collates the inputted data A with the data A at transmission, and when they are coincident, a telephone line is opened with the instruction to the device 5. The device 8 transmits an arbitrary data B. This data B is folded over again to transmit at the test station. The circuit 84 of the device 8 collates an inputted data B with the data B at transmission, and when they are coincident, the normal display is done.