| 摘要 |
PURPOSE:To omit a software runaway attendant in each exchange and to shorten the time required for the restoration of a fault by supervising the runaway of the software in each exchange concentrically on the centralized maintenance center side. CONSTITUTION:Clear signals CLR1-CLRn are inputted from the exchanges LS1-LSn to the centralized maintenance center CS1 through repeater stations 81-8n. In the center CS1, monostable multivibrators 10i (i=1,2,..., or n) corresponding to respective exchanges LS1-LSn are triggered by the signals CLRi and the output waveform is raised and then decayed after a fixed time. Therefore, the output of the monostable multivibrator 10i is repeated on and off at a fixed period during the period inputting the signal CLRi at the fixed period and an alarm lamp 12i is turned on and off repeatedly. |
