Cordless telephone apparatus

摘要

A cordless telephone is composed of a base unit connected to a telephone line and a handset unit capable of radio communications with the base unit. When the handset unit or the base unit initially transmits radio waves for forming a radio link, a channel is selected from a group of channels through which transmission is permitted irrespective of their electric field states, and the radio waves are transmitted through the selected channel. After the radio link has been formed, a speech channel is selected from all channels through which transmission is permitted. In this way, when the base unit or the handset unit initially transmits control data, the transmission is immediately carried out irrespective of an electric field state on the selected channel, whereby the radio link can be established in a reduced time. Further, when a speech communication is started, 15 channels additionally provided by the revised standard can be effectively utilized.