Juniper EX4300

N+0 Redundancy Configuration of DC Power Supplies
In an N+0 redundancy configuration, no power is reserved for resiliency regardless of
number of power supplies installed in the switch.
Depending on the power supplies installed in the switch, you can determine the system
power budget.
•
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
0
(W) + PSU
1
(W) – (0.10 x (PSU(W))
Table38 on page60 lists the N+0 power calculationfor EX4300 switchesthat use 550 W
DC power 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 tosupplypowerto PoE devices thatyouconnecttothe switch.32-port
EX4300 switches does not support Power over Ethernet (PoE).
Table 38: N+0 DC Power Calculations for EX4300 Switch Configurations
BasePower (in
watts)
Backup
Power (in
watts)
System Power
Budget (in watts)
Total Power (in
watts)
Number of
Power
Supplies
Switch
Configuration
1500550550124-port EX4300
switch
1500104511002
1490550550132-port EX4300
switch
16055055011002
1750550550148-port EX4300
switch
1750104511002
N+N Redundancy Configuration of DC Power Supplies
You can configure your switch for N+N redundancy, in which N power supplies can be
removed or fail and the remaining N power supplies continue to supply power for the
switch without interruption.
Copyright © 2017, Juniper Networks, Inc.60
EX4300 Switch Hardware Guide