| 摘要 |
PURPOSE:To permit effective radio terminal unit connection control by leading only a calling radio terminal unit to a communication channel capable of use from a control channel and rendering the other radio terminal units than a responding radio terminal unit at the time of a call arrival. CONSTITUTION:When a cordless telephone set 11 transmits a call signal along with an identification signal to a main unit 10, the unit 10 searches a vacant channel according to the received call signal. Then it transmits a channel designation signal represented the searched vacant channel. When the receiving telephone set 11 switches the channel over to the designated communication channel, the dial tone from a switchboard is transmitted to the telephone set 11. When a call signal arrives at the main unit 10 from the switchboard through a subscriber's line, the unit 10 effects search of a vacant communication channel, and a call arrival signal including a channel designation signal corresponding to the searched vacant communication channel along with an identification code using a control channel. The telephone set 11 transmits a response signal to the unit 10, and switches the designated communication channel. |
