| 摘要 |
PROBLEM TO BE SOLVED: To detect the call incoming signal of an outside line without interrupting a voice even just during communication between slave sets by synchronizing the control slot of a base unit with a communication slot at the time of communicating plural slave sets. SOLUTION: Just while speaking between slave sets is performed by using a channel f1 for communication between slave sets, a slave set PS1 receives the control slot from a base unit CS by switching that channel to a control channel fc. When there is an incoming call (ST52), the existence of call incoming of the outside line is reported to a slave set PS2 and processing for interrupting the communication with the PS2 under speaking is performed (ST55). Next, speaking for outside line speaking is started. First of all, a link channel is established by using the control channel fc (ST57 and ST58), next, a burst signal containing synchronizing data is exchanged by an instructed slot (ST59 and ST60), when synchronism is established, a burst signal containing voice data TCH is alternately transmitted (ST61 and ST62) and the communication with a party connected through a telephone line to the base unit CS is started (ST63). |
