| 摘要 |
PURPOSE:To realize the signal monitoring not affected by the subscriber line signal transmission system by connecting a monitoring switch between a subscriber circuit and a signal transmission/reception circuit and feeding a subscriber line signal to the signal transmission/reception circuit and a signal monitoring device in a digital exchange system. CONSTITUTION:The monitoring switch MON SW selects communication paths b, c, a control circuit CTL in the monitoring switch MON SW switches selectively the selected paths by the command of a controller CU and connects the paths to a monitoring device MU. Thus, a signal or information on the paths b, c is monitored without exerting any effect on the normal exchange. In placing the monitoring switch MON SW in series with the paths b, c, the MOS SW is connected normally in the route of subscriber circuit LC-signal transmitter/ receiver SIG or circuit LC-exchange switch SW. The MOS SW is constituted of a switch matrix, and the control circuit in the MON SW drives a switch with a command of the controller CU. Thus, the function of the device SIG or the terminal device T is tested without exerting any effect on the exchange operation. |
