Installation guide

Summit Family of Switches
Summit Family Switches Hardware Installation Guide
42
Figure 36: Summit X450e-48p Switch Rear Panel
Summit X450e-48p Power Supplies
The Summit X450e-48p switch is powered by both an internal power supply and an optional external
redundant power supply system.
Internal Power Supply. The internal Summit X450e-48p PSU 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 or any combination of ports where total PoE power does not exceed 370 watts. If the total
system demands exceed this power limit, you can specify:
● Port priorities to identify which ports should be ranked higher when allocating power
● Port disconnect precedence to specify the method of shutting off ports when not enough PoE power
is available
NOTE
A full discussion of these concepts is in the ExtremeXOS 12.0 Concepts Guide, Power over Ethernet section.
External Power Supplies. The Summit X450e-48p switch can be powered by one, two, or three external
power modules through the redundant power input connector on the rear of the switch.
The EPS-C (External Power Supply Chassis) is shipped with the redundant power supply cable that
connects to the redundant input connector on the rear of the switch. The EPS-C chassis can hold from
one to three 600-Watt EPS-600LS (External Power Module) units.
The PoE capability of the Summit X450e-48p switch varies depending on the number of external power
modules in use. Table 8 summarizes the PoE power behavior for the Summit X450e-48p switch based on
the number of power supply modules in use.
Table 8: Number of External PSUs and Corresponding PoE Behavior
Internal PSU
Status
EPS-600LS (1x) EPS-600LS (2x) EPS-600LS (3x)
External PSU/Chassis
Failed/Disconnected
Internal PSU:
Power On
370 W of
redundant power
740 W of
external power only
Internal PSU disabled
740 W of
external power only
with 2:1 redundancy
Internal PSU disabled
370 W of
internal power only
Internal PSU:
Power Failure
370 W of
external power only
740 W of
external power only
740 W of
external power only
with 2:1 redundancy
No PoE power
SH_033
10 Gigabit
uplink option
Management port
10 Gigabit
stacking ports
Power socket
External power
supply connection