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 switch has no
N
+
N
power supply redundancy.
•
If two power supplies are installed in the switch:
•
System power budget = (Output wattage of one power supply) – (5% of the output
wattage of one power supply)
System power budget = PSU(W) – (0.05 x PSU(W))
•
Backup power available = (Output wattage of one power supply) – (5% of the
output wattage of one power supply)
System power budget = PSU(W) – (0.05 x PSU(W))
Table 39 on page 59
lists the
N
+
N
power calculation for EX4300 switches that use 550 W
DC power supplies.
Table 39: N+N 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
12
372.5
150
522.5
522.5
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
11
347.5
175
522.5
522.5
1100
2
Related
Documentation
DC Power Supply LEDs in EX4300 Switches on page 59
•
•
DC Power Supply Specifications for EX4300 Switches on page 102
•
Installing a DC Power Supply in an EX4300 Switch on page 224
DC Power Supply LEDs in EX4300 Switches
Figure 34 on page 60
shows the location of the LEDs on a DC power supply for an EX4300
switch.
59
Copyright © 2015, Juniper Networks, Inc.
Chapter 4: Power Supplies
Summary of Contents for EX4300
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