Table 41: Airflow Direction In Ac Power Supply Models For Ex4300 Switches; Table 42: N+0 Ac Power Calculations For 24-Port Ex4300 Switches - Juniper QFabric QFX3000-G Hardware Documentation

AC Power Supply Airflow

Table 41: Airflow Direction in AC Power Supply Models for EX4300 Switches

Label on Power
Model Supply
JPSU-350-AC-AFO-A AIR OUT (AFO)
JPSU-350-AC-AFI-A
AIR IN (AFI)
JPSU-715-AC-AFO-A AIR OUT (AFO)
JPSU-1100-AC-AFO-A
AIR OUT (AFO)
JPSU-1400W-AC-AFO
AIR OUT (AFO)
N+0 Redundancy Configuration of AC Power Supplies

Table 42: N+0 AC Power Calculations for 24-Port EX4300 Switches

Power Supply Rating
PSU PSU
0 1
350 W AC –
350 W AC 350 W AC
Copyright © 2018, Juniper Networks, Inc.
Each power supply has its own fan and is cooled by its own internal cooling system.
Each power supply has a label
power supply that indicates the direction of airflow in the power supply.
Table 41 on page 165 lists the AC power supply models and the direction of airflow in
them.
Direction of Airflow
Front-to-back—that is, air intake to cool the chassis is through the vents
on the front panel of the chassis and hot air exhausts through the vents on
the rear panel of the chassis.
Back-to-front—that is, air intake to cool the chassis is through the vents
on the rear panel of the chassis and hot air exhausts through the vents on
the front panel of the chassis.
Front-to-back—that is, air intake to cool the chassis is through the vents
on the front panel of the chassis and hot air exhausts through the vents on
the rear panel of the chassis.
Front-to-back—that is, air intake to cool the chassis is through the vents
on the front panel of the chassis and hot air exhausts through the vents on
the rear panel of the chassis.
Front-to-back—that is, air intake to cool the chassis is through the vents
on the front panel of the chassis and hot air exhausts through the vents on
the rear panel of the chassis.
In an N+0 redundancy configuration, lower priority PoE ports may be impacted if a power
supply fails.
Table 42 on page 165 lists the N+0 power calculation for 24-port EX4300 switches that
use 350 W, 715 W, and 1100 W power supplies.
Total Power
(in watts)
PSU (W) +
0
PSU (W)
1
350
700
or
AIR OUT (AFO) AIR IN (AFI)
Usable Backup
System Power Base
Power (in (in Power (in
watts) watts) watts)
350 0 150
665 0 150
Chapter 7: EX4300 Overview
on the faceplate of the
Available Ports
PoE Power Enabled
(in watts) for PoE+
200 6
515 17
165