Summit X460-24p and X460-48p switches have two removable internal PSUs, each capable of delivering 380 W of power.
When two PSUs are present, the total power budget is 760 W and PSU load-sharing is in effect. If one PSU fails or is removed then the power budget will drop to 380 W and port priority will be used to determine which ports remain powered up if usage was more than 380 W before the event.
Note
The power budget is set to 60W during startup.The Summit X430-24p have one internal PSU capable of delivering 370W of power.
The Summit X440-24p switches have one internal PSU capable of delivering 380 W of power.
The Summit X440-8p switches have one internal PSU capable of delivering 170 W of power.
The Summit X450-G2 non-PoE+ models support a fixed internal 156W AC/DC PSU, whereas X450-G2 PoE+ models support dual, hot-swappable 1100W/715W/350W AC/DC PSUs.
The Summit X460-G2 supports two PSUs : 1100W and 715W. When 1100W is used, the switch is capable of delivering 850W of power. When 715W is used, the switch is capable of delivering 465W of power.
On modular PoE switches, the power budget is provided on a per slot basis, not switchwide.
Note
We recommend that when using a modular switch you fully populate a single PoE module with PDs until the power usage is just below the usage threshold, instead of spacing PDs evenly across PoE modules.If you disable a slot with a PoE module, the reserved power budget remains with that slot until you unconfigure or reconfigure the power budget. Also, you can reconfigure the reserved power budget for a PoE module without disabling the device first; you can also reconfigure dynamically. These settings are preserved across reboots and other power-cycling conditions.
Note
On modular switches, PoE modules are not powered-up at all, even in data-only mode, if the reserved PoE power cannot be allocated to that slot.To reduce the chances of ports fluctuating between powered and non-powered states, newly inserted PDs are not powered when the actual delivered power for the module or switch is within a preset value below the configured inline power budget for that slot or switch.
This band is called the guard band and the value used is 20 W for Summit X430, X440-24p, X460-24p, X460-48p, X460-G2, X440-8p, and X440-48p switches. However, actual aggregate power can be delivered up to the configured inline power budget for the slot or switch (for example, when delivered power from ports increases or when the configured inline power budget for the slot is reduced).
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