Extreme Networks Summit X150 Series, Hardware Installation Manual

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Chapter 2: Summit Power Supplies
Summit Family Switches Hardware Installation Guide
144
PoE Redundant Power Configurations
The PoE capability of the Summit X450e-48p or X250e-48p varies depending on the number of external
power modules in use.
Table 43 summarizes the PoE power behavior for the Summit X450e-48p or
X250e-48p switch based on the number of power modules in use.
Single 600-LS Module Configuration: Redundant PoE Power
A single EPS-600LS power module provides redundant PoE power capability with the same 370-watt
capacity as the internal power supply. The internal Summit X450e-48p or X250e-48p power supply is
capable of 370 W of PoE power: 15.4 W supplied to each port for a 24-port configuration and 7.7 W
supplied to each port for a 48-port configuration.
●
If the internal power supply fails, the external power module will provide power to PoE devices at
the same power levels as the internal power supply without any power interruptions.
●
If the EPS-600LS power module fails or is removed, the internal power supply continues to provide
PoE power without any power interruptions.
Dual 600-LS Module Configuration: Full Power
Two EPS-600LS power modules provide full power at 740 W; this power level allows 15.4 W of PoE
power to all 48 ports. In this full-power configuration, the internal power supply is disabled, and
therefore redundant power is not available.
Triple 600-LS Module Configuration: Full Redundant Power
Three EPS-600LS power modules provide the full 740 W of power for 15.4 W of PoE power to all 48
ports. In addition, this configuration provides 2:1 redundancy. If one of the EPS-600LS power modules
fails, the third power module continues to provide uninterrupted full PoE power. The internal power
supply is disabled in this configuration.
Table 43: External Power Modules and Corresponding PoE Behavior
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