Extreme Networks Summit X150 Series Hardware Installation Manual page 149

WARNING!
The 2x9 cable is not hot-pluggable. Do not attach a powered EPS-C2 to any Summit switch using the 2x9
connector. See "Installing an EPS-C2 Chassis" on page 322
Table 46: External Power Modules and Corresponding PoE Budget using the 2x9 Connector of
the EPS-C2
Switch Internal One installed
Power Supply 750W PoE
Status PSU
Power On 370 W of
redundant
power
Power Failure 370 W of
external power
only
Single 750W PoE PSU Configuration: Redundant PoE Power
A single 750W PoE PSU 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
Watts of PoE power: 15.4 Watts supplied to each port for a 24-port configuration and 7.7 Watts supplied
to each port for a 48-port configuration.
If the internal power supply fails, the external power module will provide power to the switch and PoE
devices at the same power levels as the internal power supply without any power interruptions.
If the 750W PoE PSU fails or is removed, the internal power supply of the switch continues to provide
PoE power without any power interruptions.
Dual 750W PoE PSUs Configuration: Full Power
Two 750W PoE PSUs provide full power at 740 Watts; this power level allows 15.4 Watts 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 750W PoE PSUs Configuration: Full Redundant Power
Three 750W PoE PSUs provide the full 740 Watts of power for 15.4 Watts of PoE power to all 48 ports.
In addition, this configuration provides 2:1 redundancy. If one of the 750W PoE PSU fails, the third
power module continues to provide uninterrupted full PoE power. The internal power supply of the
switch is disabled in this configuration.
For information on installing the EPS-C2, see
Summit Family Switches Hardware Installation Guide
for installation instructions.
Two installed 750W
PoE PSU
740 W of external
power only
Internal power supply
disabled
740 W of external
power only
"Installing an EPS-C2 Chassis" on page
Three installed 750W
PoE PSU
740 W of external
power only with 2 + 1
redundancy
Internal power supply
disabled
740 W of external
power only with 2 + 1
redundancy
External Power Supplies
External Power
Supply/Chassis
Failed/Disconnected
370 W of internal
power only
No PoE power
322.
149