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Summit Family Switches Hardware Installation Guide
33
Summit X250e-48p Power Supplies
The Summit X250e-48p switch is powered by both an internal power supply and an optional external
redundant power supply system.
Internal Power Supply
The internal Summit X250e-48p internal 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 a 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 one of the following:
● 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 ExtremeXOS Concepts
Guide.
External Power Supplies
The EPS-600LS External Power Module provides optional redundant power for the Summit X250e-48p
switch. Through the redundant power input connector on the rear panel, the switch can be powered by
one, two, or three external power modules installed in the EPS-C External Power Supply Chassis.
The PoE capability of the Summit X250e-48p varies depending on the number of external power
modules in use. Table 8 summarizes the PoE power behavior for the Summit X250e-48p switch based on
the number of power supply modules in use.
For specifications and installation instructions for the external power module, see “EPS-600LS External
Power Module” on page 77.
Table 8: Number of External Power Modules and Corresponding PoE Behavior
Internal Power
Supply Status
EPS-600LS (1x) EPS-600LS (2x) EPS-600LS (3x)
External PSU/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