| 摘要 |
PURPOSE:To perform the effective use of lines and to cancel uncertainty, by transmitting a signal informing the absence automatically to a callout signal from a mobile station, through setting the information to a device in a base station, when the operator is absent in the base station. CONSTITUTION:Electromagnetic waves modulated with a callout signal transmitted from an antenna 1 of a mobile station device are received at a base station, and the received output inputs to a signal reception section 8 from a connecting terminal 6 of the base station device and is converted into a DC signal after demodulation. Further, this signal is transmitted to an exchange control section 9 and a signal transmission section 10 to make callout for an exclusive telephone set for a fixed time through an exclusive telephone set connecting section 11. On the other hand, when the information of absent operator is transmitted from the section 10 to a transmission control section 13 before the callout and it is applied to a radio set through a transmitter modulation input connection terminal 7 modulated at a modulation section 12. The electromagnetic waves are received at the mobile station to confirm the status of the base station, allowing to perform effective use of lines and elimination of uncertainty. |
