| 摘要 |
<p>In a cordless telephone set, a single RF communications channel selection switch (SW1; SW4), which may be mounted on either of the base unit (120;420) and handset unit (100;400), selects the frequency for the unit to which it is mounted. The other unit of the base unit and handset unit selects alternate frequencies in response to a series of unacknowledged communications, until it receives an acknowledgement on a particular channel. After receiving an acknowledgement, an indication of the current RF communications channel is stored in memory. If no acknowledgement is received after trying all channels, then the original RF communications channel is selected.</p> |
