| 摘要 |
PURPOSE:To enable to use the DC power supply which is always being charged, as the auxiliary power supply if the DC power supply for the slave station is discharged, in the master station of cordless telephone set in which the subscriber lines in-house are constituted with radio lines. CONSTITUTION:The master station 1 is connected to the subscriber lines 1, and the master ans slave stations 2 are connected with radio lines. The master station 1 is provided with the chargeable DC power supply, it is always charged, and the power supply to the radio unit in the master station 1 is given from commercial power supply, but on failure, the DC power supply charged is changed over for the power supply of the master station 1. The slave station 2 is provided with the battery for the supply of DC power. The communication without interruption can be made by using the DC power supply charged at the master station 1 if this battery is discharged. |
