| 摘要 |
PURPOSE:To detect easily an error of a time division signal by adding a check signal in a time division switch input side of an electronic exchange, and checking the check signal in accordance with a time slot in an output side. CONSTITUTION:In an input side of a time division switch, a parity signal generating circuit 3 is provided, and a parity signal for checking the normality of this signal is added to a time division signal passing through a register 2, and supplied through a switch memory 5 and a memory switch 4. Also, an error existence signal by a time division signal error detecting circuit 14 of an output side is counted by an error counting counter 12 through an AND gate 11 which is opened by an optionally designated time slot signal passing through a coincidence circuit 9, and a result of counting is displayed. In this way, an error of the time division signal can be detected easily. |
