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))
Table 38 on page 58
lists the
N
+0 power calculation for EX4300 switches that use 550 W
DC power supplies.
Table 38: N+0 DC Power Calculations for EX4300 Switch Configurations
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)
Number
of Power
Supplies
Switch
Configuration
13
400
150
0
550
550
1
24-port
EX4300 switch
24
895
150
0
1045
1100
2
N/A
N/A
149
0
550
550
1
32-port
EX4300 switch
N/A
N/A
160
550
550
1100
2
12
375
175
0
550
550
1
48-port
EX4300 switch
29
870
175
0
1045
1100
2
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.
You can configure the power management software to manage switch power for
N
+
N
redundancy. When you configure power management for
N
+
N
redundancy, half of the
total power available (
N
) is held as reserve power while the other half (
N
) is available
for immediate consumption. If the switch configuration changes and requires additional
power, then additional power is drawn from the reserve power, and the switch no longer
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
.
Copyright © 2015, Juniper Networks, Inc.
58
EX4300 Switch Hardware Guide
Summary of Contents for EX4300
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