Summit X450e-48p Power Supplies

Internal Power Supply

The Summit X450e-48p switch is powered by both an internal power supply and an optional external redundant power supply system.

The internal Summit X450e-48p power supply can provide 370 W of PoE power, as follows:

In a 24-port configuration, it provides 15.4 W to each port.
In 48-port configuration or any combination of ports where total PoE power does not exceed 370 watts, it provides 7.7 W to each port.

If the total system demands exceed this power limit, you can specify:

Port priorities to identify which ports should be ranked higher when allocating power.
Port disconnect precedence to specify the method of shutting off ports when not enough PoE power is available.

Note

For a detailed discussion of these concepts, see the Power over Ethernet section in the .

External Power Supplies

The Summit X450e-48p switch can be powered by one, two, or three external power modules through the redundant power input connector on the rear of the switch.

The EPS-C (External Power Supply Chassis) is shipped with the redundant power supply cable that connects to the redundant input connector on the rear of the switch. The EPS-C chassis can hold from one to three 600-Watt EPS-600LS external power module units.

The PoE capability of the Summit X450e-48p switch varies depending on the number of external power modules in use. The following table summarizes the PoE power behavior for the Summit X450e-48p switch based on the number of power supply modules in use.

Internal Power Supply Status	EPS-600LS (1x)	EPS-600LS (2x)	EPS-600LS (3x)	External Power Supply/Chassis Failed/Disconnected
Internal Power Supply: Power On	370 W of redundant power	740 W of external power only Internal power supply disabled	740 W of external power only with 2:1 redundancy Internal power supply disabled	370 W of internal power only
Internal Power Supply: Power Failure	370 W of external power only	740 W of external power only	740 W of external power only with 2:1 redundancy	No PoE power

Internal Power Supply Status

EPS-600LS (1x)

EPS-600LS (2x)

EPS-600LS (3x)

External Power Supply/Chassis Failed/Disconnected

Internal Power Supply:

Power On

370 W of

redundant power

740 W of

external power only

Internal power supply disabled

740 W of

external power only with 2:1 redundancy

Internal power supply disabled

370 W of

internal power only

Internal Power Supply:

Power Failure

370 W of

external power only

740 W of

external power only

740 W of

external power only with 2:1 redundancy

No PoE power

For more information, see EPS-600LS External Power Module.

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