has
N
+
N
power supply redundancy. This condition raises a minor alarm. If the condition
is not corrected within 5 minutes, then a major alarm is issued.
For more information about how power management allocates power to chassis
components when power is insufficient, see Understanding Power Management on EX
Series Switches.
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))
•
Backup power available = 0 W
A minor alarm is raised as the switch has no
N
+
N
power supply redundancy.
•
If two power supplies are installed in the switch:
•
System power budget = (Output wattage of the power supply that has the lower
output wattage) – (5% of the output wattage of the power supply that has the lower
output wattage)
System power budget = MIN(PSU
0
(W), PSU
1
(W)) – (0.05 x MIN (PSU
0
(W),
PSU
1
(W))
•
Backup power available = (Output wattage of the power supply that has the lower
output wattage) – (5% of the output wattage of the power supply that has the lower
output wattage)
Backup power available = MIN(PSU
0
(W), PSU
1
(W)) – (0.05 x MIN (PSU
0
(W),
PSU
1
(W))
Table 32 on page 52
lists the
N
+
N
power calculation for 24-port EX4300 switches that
use 350 W, 715 W AC, and 1100 W AC power supplies.
Table 32: N+N 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)
Power Supply Rating
PSU
1
PSU
0
6
200
150
0
350
350
–
350 W AC
6
182.5
150
332.5
332.5
700
350 W AC
350 W AC
6
182.5
150
332.5
332.5
1065
715 W AC
350 W AC
18
565
150
0
715
715
–
715 W AC
17
529.25
150
679.25
679.25
1430
715 W AC
715 W AC
17
529.25
150
679.25
679.25
1815
1100 W AC
715 W AC
Copyright © 2015, Juniper Networks, Inc.
52
EX4300 Switch Hardware Guide
Summary of Contents for EX4300
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