| 摘要 |
PURPOSE:To realize an easy measurement for the variation of the amount of delay for the transmission line, by securing a multiplex transmission of the control signal and then using the frame synchronous signal as the phase monitor signal. CONSTITUTION:The frame synchronous signal 8, the circuit control signals 9 and 10 plus the base station control signal 11 are supplied to the multiplexing device 12 from the control unit 7 of the radio circuit control station 4. Thus the signals 9-11 are multiplexed to be transmitted to the base station 2 via the control signal transmission line 5 and along with the signal 8. At the station 2, the control signals 15- 17 are isolated through the isolating device 13 and via the signal 8 and then supplied to the transmitters/receivers 19 and 20 plus the control unit 21 each. On the other hand, the reception signal from the mobile station and the control signal from the unit 21 are multiplexed by the device 25 to be transmitted to the station 4. At the station 4, the device 31 gives a monitor to the phase difference between the signal 8 and the frame synchronous signal 27 led out of the isolating device 26. And thus the amount of delay is measured for the transmission line group between the stations 4 and 2. |
