| 摘要 |
A controller in PSE (Power Sourcing Equipment) controls how to provision uninterruptible power through corresponding ports (and cables) of the PSE to network devices. For example, the controller of the PSE receives a signal indicating a transition of powering the PSE from a primary power input to a backup power supply. The backup power supply has a limited ability to provide backup power to the PSE. In response to receiving the signal, the controller of the PSE utilizes a powering/de-powering algorithm to generate control information used by the controller to selectively discontinue providing power through the certain ports to respective network devices. Consequently, the PSE and, more specifically, the controller provisions power from the PSE depending on a priority level associated with network devices, extending the power life of critical powered network devices and more efficiently using the backup power supply in the case of a power failure.
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