| 摘要 |
PURPOSE:To maintain transmission quality without spoiling communication service offered to subscribers, by monitoring a signal for the communication state of a terminal equipment, transmitted from the terminal in the communication state to a switching equipment via a communication circuit, all the time by the switching equipment. CONSTITUTION:To subscriber circuit terminator 2 connected to terminal equipment 1, data switching equipment 4 is connected via subscriber circuit 3 and to detection part 41 provided to switching equipment 4, quality measurement part 5 is connected to constitute data switching network N. Switching equipment 4 is provided with switching part 42 together with detection part 41, which monitors all the time a signal for the communication state of terminal equipment 2 in the communication state transmitted from terminal 2 to switching equipment 4 via circuit 3. When the signal showing the communication state is detected by detection part 41, quality measurement part 5 is actuated to collate the signal format, indicating the normal no-communication state, with the communication state detected by detection part 41, so that the transmission quality of circuit 3 will be maintained without spoiling the communication service effered to subscribers. |
