| 摘要 |
A base station of a cordless telephone system has three pairs of transceivers 26. Power to the transceivers 26 is provided by a parallel array of power supply units 12 which deliver power to the transceivers 26 through a power distribution unit 18. Individual power buses 20, 22, 24 supply power from the power distribution unit 18 to the transceivers 26 and to a station unit 28. If the output voltage from the power supply units 12 falls, the power distribution unit 18 progressively isolates the power buses in accordance with a predetermined power-shedding priority rating, to provide a progressive and organised reduction in capability under fault conditions. In an alternative arrangement having a single power bus (30), (Figure 2), internal power supply relays in each transceiver are controlled in accordance with the power-shedding priority rating. If the system is operating on battery power 16, following failure of the primary power source 10, low priority equipment is disconnected to conserve power. <IMAGE> |
