| 摘要 |
PROBLEM TO BE SOLVED: To find a cause that a cordless slave set can not be used by confirming at once a radio channel operating state of a connection device in a system. SOLUTION: The cordless telephone set where call reception and transmission is made to a trunk line 6 by connecting cordless slave sets 12a, 12b to a private branch exchange 1 managing and controlling the operation of multi-zone cordless telephone system via connectors 7a, 7b for radio base station is provided with a radio channel operating state display means 22 receiving radio channel operating information of the connectors 7a, 7b monitored by the private branch exchange 1 to display the radio channel operating state, and the radio channel operating state display means 22 displays the possibility of use of radio channels by the cordless slave sets 12a, 12b and a cause when not available. |
