| 摘要 |
A power supply is configured to accept battery and external power sources, and is adapted for use in equipment in a broadband communications network. The power supply includes a first voltage detector adapted to detect a first voltage signal at an electrical path associated with the battery power source; a second voltage detector adapted to detect a second voltage signal at an electrical path associated with the external power source; a processor responsive to the first voltage detector and the second voltage detector, adapted to receive the first voltage signal and the second voltage signal and generate an electrical signal indicating whether the battery power source is present, charged and being used based on the first voltage signal and the second voltage signal; and a light emitting diode responsive to the processor, adapted to receive the electrical signal and, based on the electrical signal, display, in an order of priority, one of a plurality of states, which indicates whether the battery power source is present, charged or being used.
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