N+0 Redundancy Configuration Of Dc Power Supplies; N+N Redundancy Configuration Of Dc Power Supplies; Table 38: N+0 Dc Power Calculations For Ex4300 Switch Configurations - Juniper EX4300 Hardware Manual

EX4300 Switch Hardware Guide

N+0 Redundancy Configuration of DC Power Supplies

Table 38: N+0 DC Power Calculations for EX4300 Switch Configurations

Number of
Switch Power
Configuration Supplies
24-port EX4300 1
switch
2
32-port EX4300 1
switch
2
48-port EX4300 1
switch
2

N+N Redundancy Configuration of DC Power Supplies

60
In an N+0 redundancy configuration, no power is reserved for resiliency regardless of
number of power supplies installed in the switch.
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
Table 38 on page 60 lists the N+0 power calculation for EX4300 switches that use 550 W
DC power supplies.
NOTE: The DC power supply in the switch does not support Power over
Ethernet (PoE); you can use either an external power injector or an AC power
supply to supply power to PoE devices that you connect to the switch. 32-port
EX4300 switches does not support Power over Ethernet (PoE).
Total Power (in
watts)
550
1100
550
1100
550
1100
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.
(W) + PSU (W) – (0.10 x (PSU(W))
0 1
Backup
System Power Power (in
Budget (in watts) watts)
550 0
1045 0
550 0
550 550
550 0
1045 0
Base Power (in
watts)
150
150
149
160
175
175
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