Installation Guide

The following table summarizes the PoE power provided using the 2x9 connector to a Summit
X450e-48p or X250e-48p switch based on the number of installed PSUs.
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 Power Supply on page 380 for installation
instructions.
Table 74: Meaning of Switch Internal Power Supply Status Indicators
Switch Internal
Power Supply
Status
One installed
750 W PoE PSU
Two installed 750 W
PoE PSU
Three installed 750
W PoE PSU
External Power
Supply/Chassis
Failed/Disconnected
Power On 380 W of
redundant
power
760 W of external
power only
Internal power
supply disabled
760 W of external
power only with 2 + 1
redundancy
Internal power
supply disabled
380 W of internal
power only
Power Failure 380 W of
external power
only
760 W of external
power only
760 W of external
power only with 2 + 1
redundancy
No PoE power
Single 750 W PoE PSU Configuration: Redundant PoE Power
A single 750 W PoE PSU provides redundant PoE power capability up to a 380-watt maximum capacity.
This is sucient to supply up to 15.4 watts per port for a 24-port configuration and up to 7.7 watts per
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 750 W PoE PSU fails or is removed, the internal power supply of the switch continues to provide
PoE power without any power interruptions.
Dual 750 W PoE PSUs Configuration: Full Power
Two 750 W PoE PSUs provide full power at 760 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 750 W PoE PSUs Configuration: Full Redundant Power
Three 750 W PoE PSUs provide the full 760 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 750 W 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 Installing an EPS-C2 Power Supply on page 380.
Each EPS-C2 power supply is shipped with a special redundant power supply cord.
EPS-C2 Redundant Power System
Power Supplies for Use with Your Switch
174 Summit Family Hardware Installation Guide