| 摘要 |
A key telephone system includes a main unit, a DSS interface, and a detector. The main unit includes a speech path switch, a plurality of call processing interfaces, an operating data memory, operation mode setting switches, and a controller for controlling the speech path switch by referring to the operating data memory when data transmission is periodically performed between the plurality of key telephone sets through the call processing interface in the call processing mode, and for updating contents of the operating data memory according to operating data externally input in the data setting mode. The DSS interface connects at least one DSS console. The detector detects that first normal data received, after a periodic data transmission with the DSS console through the DSS interface is an abnormal transmission for a predetermined period of time, is data unique to the key telephone set. The controller controls the operation mode setting switches in association with an output from the detector to change the call processing mode into the data setting mode.
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