Extreme Networks Summit X150 Series Hardware Installation Manual page 131

The following table lists the power capability in watts of the EPS-C2 based on the number of installed
PSUs. Check the power requirements of your switches to determine how many PSUs you need to install
into the EPS-C2 chassis.
1 PSU
2 PSU
3 PSU
EPS-C2 2x7 connector and 2x9 connector
2x7 connector
The following subsections describe the differences in how the EPS-C2 delivers power to the 2x7
connector and 2x9 connector.
The 2x7 connector is compatible with Summit X440 switches. Using the 2x7 connector, the EPS-C2
provides redundant PoE power at the same level no matter how many PSUs are installed. That is, if
there are one, two, or three PSUs installed into the EPS-C2, the EPS-C2 will provide redundant PoE
power capability at the same 380 watts capacity as the internal power supply of the connected Summit
X440 series switches. The PoE power supplied does not increase more than 380 watts even if
additional PSUs are installed.
Internal-to-External Power Supply Transfer
When a EPS-C2 is connected to the Summit X440 switch and the internal power supply fails, power is
drawn from the EPS-C2 without power interruption to the switch or PoE connected devices.
External-to-Internal Power Supply Transfer
When a EPS-C2 is connected to the Summit X440 switch and the EPS-C2 fails or is disconnected,
power is drawn from the internal power supply without interruption to the switch or PoE connected
devices.
2x9 connector
The 2x9 connector is compatible with the Summit X450e-48p or Summit X250e-48p switch. Unlike the
function on the 2x7 connector, the PoE capability of the EPS-C2 using the 2x9 connector for the
Summit X450e-48p or X250e-48p varies depending on the number of PSUs installed in the EPS-C2.
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
Summit Family Hardware Installation Guide
12V Power (W)
300
600
900
Installing an EPS-C2 Chassis
Summit Power Supplies
PoE Power (W)
380
760
1140
for installation instructions.
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