N+0 Redundancy Configuration of AC Power Supplies
In an N+0 redundancy configuration, lower priority PoE ports may be impacted if a power
supply fails.
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 wattages of the two power supplies) –
(10% of the output wattage of the power supply that has the higher output wattage)
System power budget = PSU
0
(W) + PSU
1
(W) – (0.10 x MAX (PSU
0
(W), PSU
1
(W))
Table 29 on page 52 lists the N+0 power calculation for 24-port EX4300 switches that
use 350 W AC, 715 W AC, and 1100 W AC power supplies.
Table 29: N+0 AC Power Calculations for 24-Port EX4300 Switches
Ports
Enabled
for PoE+
Available
PoE Power
(in watts)
Base
Power (in
watts)
Backup
Power
(in
watts)
System
Power
Budget (in
watts)
Total Power
(in watts)
PSU
0
(W) +
PSU
1
(W)
Power Supply Rating
PSU
1
PSU
0
62001500350350–350 W AC
175151500665700350 W AC350 W AC
247201500993.51065715 W AC350 W AC
185651500715715–715 W AC
2472015001358.51430715 W AC715 W AC
247201500170518151100 W AC715 W AC
24720150011001100–1100 W AC
247201500209022001100 W AC1100 W AC
24720150013401450350 W AC1100 W AC
Table 30 on page 53 lists the N+0 power calculation for 32-port EX4300 switches that
use the 350 W AC power supply.
Copyright © 2017, Juniper Networks, Inc.52
EX4300 Switch Hardware Guide
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