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 50
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
6
200
150
0
350
350
–
350 W AC
17
515
150
0
665
700
350 W AC
350 W AC
24
843.5
150
0
993.5
1065
715 W AC
350 W AC
18
565
150
0
715
715
–
715 W AC
24
1208.5
150
0
1358.5
1430
715 W AC
715 W AC
24
1555
150
0
1705
1815
1100 W AC
715 W AC
24
950
150
0
1100
1100
–
1100 W AC
24
1940
150
0
2090
2200
1100 W AC
1100 W AC
24
1190
150
0
1340
1450
350 W AC
1100 W AC
Table 30 on page 51
lists the
N
+0 power calculation for 32-port EX4300 switches that
use the 350 W AC power supply.
Copyright © 2015, Juniper Networks, Inc.
50
EX4300 Switch Hardware Guide
Summary of Contents for EX4300
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