| 摘要 |
<p>PURPOSE:To prevent defect such as communication interruption when power supply by an external power supply is disable and battery power supply is implemented by devising the connection of extensions and external lines. CONSTITUTION:When a power supply detection means 14 detects it that power supply by an external power supply is disable, power supply by battery 10 is selected and a report representing it is sent to extension facsimile equipment FI1-FIn. Moreover, when a prescribed time within a duration time of the battery 10 elapses, a report of warning system-down is sent to the extension facsimile equipments FI1-FIn. Moreover, when a prescribed time within the duration time of the battery 10 elapses, the operating state of a line is detected and idle extensions LI1-LIn and external lines LO1-LOm are connected directly and when there are busy lines, the extensions LI1-LIn and external lines LO 1-LOm are directly connected after the end of the communication.</p> |
