Extreme Networks Summit X150 Series Hardware Installation Manual page 127

Table 70: POE Power Behavior
Internal Power EPS-600LS (1x)
Supply Status
Internal Power 370 W of
Supply: redundant power
Power On
Internal Power 370 W of
Supply: external power only
Power Failure
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.
Internal-to-External Power Supply Transfer
This section describes the conditions that would cause the Summit X450e-48p or X250e-48p switch to
draw power from the external power unit.
Summit Family Hardware Installation Guide
EPS-600LS (2x) EPS-600LS (3x)
740 W of 740 W of
external power only external power only
Internal power supply with 2 + 1 redundancy
disabled Internal power supply
disabled
740 W of 740 W of
external power only external power only
with 2 + 1 redundancy
Summit Power Supplies
External Power Supply/
Chassis Failed/
Disconnected
370 W of
internal power only
No PoE power
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