Hewlett Packard Enterprise Development LP

Hong Yi Wee

Kah Hoe Ng

Shiyu Tian

See Yun Yow

Kelly Khe Liq Khoo

One aspect provides a power sourcing equipment controller for providing power to a powered device using power-over-Ethernet (PoE). The power sourcing equipment includes a voltage-output logic block to output a sequence of voltage signals, the voltage signals comprising at least a detection signal and a classification signal; a current-measurement logic block to measure current provided responsive to the voltage signals; a backoff-time-determination logic block to determine a backoff time in response to the current-measurement logic block detecting the provided current exceeding a predetermined threshold, the backoff time being determined based on an amount of time needed for discharging an internal capacitor associated with the powered device; and a timing logic block to cause the voltage-output logic block to delay the output of a next sequence of voltage signals based on the determined backoff time, thereby facilitating powering up of a device compliant with a different PoE standard.

Adaptive backoff time in power-over-ethernet detection cycles

Systems and methods disclosed herein allow efficient reallocation of PoE when a PSU for a PSE fails. A PSE initially receives power from at least two PSUs and provides PoE to at least two PDs. When power from one of the PSUs becomes unavailable, the PSE refrains from providing PoE to a first PD, but continues providing PoE to a second PD. The PSE sends a communication to the second PD requesting that the second PD allow the PSE to allocate less power to the second. If the second PD confirms that allocating less power to the second PD is acceptable, the PSE reduces the amount of power allocated to the second PD and allocates at least some of the power saved by the reduction to the first PD.

Response mechanisms for power-interruption events in PoE systems

Example implementations relate to a power sourcing equipment (PSE), and a method of reallocating power to one or more powered devices (PDs) by the PSE, before a swap event of a power supply unit (PSU). The method includes receiving an information about the swap event, determining based on the information that the swap event is expected to cause powering down of the one or more PDs, and requesting a first PD among the one or more PDs to permit the PSE to reduce an initial value of power allocated to the first PD. Further, the method includes reducing an amount of power to the first PD from the initial value to a reduced value of power based on a response from the first PD, and reallocating the reduced value of the power to the first PD to avoid powering down of the one or more PDs during the swap event.

Response mechanisms of a power sourcing equipment to a swap event of a power supply unit

Example implementations relate to a dual-sided fan tray assembly of an electronic system. The fan tray assembly includes a housing having a front panel, a back panel, and a pair of side walls coupled to the front and back panels. The fan tray assembly further includes a handle assembly pivotably connected to the pair of side walls such that the handle assembly is at least rotatable around the housing to at least first and second positions spaced apart from each other. When the handle assembly is rotated to the first position, the fan tray assembly is slidably insertable into a chassis of an electronic system with the front panel facing the chassis to install the fan tray assembly to the electronic system. When the handle assembly is rotated to the second position, the fan tray assembly is slidably insertable into the chassis with the back panel facing the chassis.

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Singapore, Singapore

Hong Yi Wee