Eps-C2 2X7 Connector And 2X9 Connector - Extreme Networks Summit X150 Series Hardware Installation Manual

Chapter 2: Summit Power Supplies
The 750W AC PoE PSU used on the EPS-C2 has two power rails: 12V and PoE. These two power rails
are independent. If the PoE rail overloads, it will shut down all PoE but the 12V rail will continue to
function. If the 12V rail overloads, the 12V shuts down and the PoE rail will continue to function.
One redundant 2x7 power cable is shipped with the EPS-C2 chassis to provide the connection between
the external power system and the redundant power input connector on the back of a switch.
Additional redundant power cables are available from Extreme Networks.
Table 45 shows 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.
Table 45: EPS-C2 Power and PSUs
12V Power (W)
1 PSU 300
2 PSU 600
3 PSU 900

EPS-C2 2x7 connector and 2x9 connector

The following subsections describe the differences in how the EPS-C2 delivers power to the 2x7
connector and 2x9 connector.
2x7 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.
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.
148
PoE Power (W)
380
760
1140
Summit Family Switches Hardware Installation Guide
Table 43