| 摘要 |
PURPOSE:To eliminate economically a dial tone through simple control of a repeater station by preventing the dial tone from an incoming terminal from being sent to an originating subscriber. CONSTITUTION:Originating sender OS of a repeater station is provided with initial- number sending discrimination relay MPS, which judges that sender OS has sent an initial number to an incoming terminal station, so as to make sender ready to reset, thereby erasing a dial tone from the incoming terminal station to a next station. Consequently, the control is simplified and the dial tone can economically be erased. |
