| 摘要 |
A mobile telephone terminal (1) includes a portable-unit (3) and an adaptor (2) which is capable of mounting the portable-unit on a vehicle and supplying power from a vehicle battery (7) to the portable-unit. The adapter includes a power switch (201) manually generating a switch signal and a delay circuit (23) which delays the switch signal by a predetermined period of time when the telephone terminal is in a communication state and the power switch is depressed in place of a call end key. In response to the delayed switch signal, a transistor switch circuit (24) stops power supply from the vehicle battery to the portable-unit. The portable-unit initiates a call clear process in response to the switch signal and during the predetermined period of time performs and completes the call clear process. In the call clear process, the portable-unit transmits a call clear signal to a base station over a radio channel used and turns off its radio frequency section. The call clear process makes the used radio channel available for other parties immediately after the call finishes. |
