Juniper EX4300 Series Hardware Manual page 126

• If one power supply is installed in the switch:
System power budget = Output wattage of the installed power supply (PSU(W))
• If two power supplies are installed in the switch:
System power budget = (Sum of the output wattage of the two power supplies) – (10% of the output
wattage of the installed power supply)
System power budget = PSU
Table 49 on page 116 lists the
supplies.
NOTE: The DC power supply in the switch does not support Power over Ethernet (PoE); you can
use either an external power injector or an AC power supply to supply power to PoE devices that
you connect to the switch. 32-port EX4300 switches does not support Power over Ethernet
(PoE).
Table 49: N+0 DC Power Calculations for EX4300 Switch Configurations
Switch Configuration
24-port EX4300 switch
32-port EX4300 switch
48-port EX4300 switch
(W) + PSU (W) – (0.10 x (PSU(W))
0 1
N +0 power calculation for EX4300 switches that use 550 W DC power
Number of Total Power
Power Supplies (in watts)
1 550
2 1100
1 550
2 1100
1 550
2 1100
Usable System Backup Power
Power (in (in watts)
watts)
550 0
1045 550
550 0
550 550
550 0
1045 550
116
Base Power
(in watts)
150
150
149
160
175
175