| 摘要 |
PROBLEM TO BE SOLVED: To reduce burden of work in installation. SOLUTION: The master set includes a switching means for connecting a power feed channel and a call channel between the master set and a connection terminal T, and a full-terminal connection means for connecting and disconnecting a call channel between the master set and all connection terminals T. When making a call with a slave set B, the master set disconnects the call channel with the full-terminal connection means and causes the switching means to switch connection to a connecting terminal to which the slave set B of a calling party is connected to ensure a call channel with the slave set B. When making a call with a sensor camera C, the master set causes the full-terminal connecting means to connect the call channels R1-R3 to make a call with the sensor camera C. COPYRIGHT: (C)2008,JPO&INPIT
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