Juniper EX4300 Series Hardware Manual page 106

Table 31: Airflow Direction in AC Power Supply Models for EX4300 Switches
Model
JPSU-350-AC-AFI-A
JPSU-715-AC-AFO-A
JPSU-1100-AC-AFO-
A
JPSU-1400W-AC-
AFO
N+0 Redundancy Configuration of AC Power Supplies
N +0 redundancy configuration, lower priority PoE ports may be impacted if a power supply fails.
In an
Table 32 on page 96 lists the
715 W, and 1100 W power supplies.
Table 32: 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
Label on Direction of Airflow
Power Supply
AIR IN (AFI) 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.
AIR OUT Front-to-back—that is, air intake to cool the chassis is through the
(AFO) vents on the front panel of the chassis and hot air exhausts through
the vents on the rear panel of the chassis.
AIR OUT Front-to-back—that is, air intake to cool the chassis is through the
(AFO) vents on the front panel of the chassis and hot air exhausts through
the vents on the rear panel of the chassis.
AIR OUT Front-to-back—that is, air intake to cool the chassis is through the
(AFO) vents on the front panel of the chassis and hot air exhausts through
the vents on the rear panel of the chassis.
N +0 power calculation for 24-port EX4300 switches that use 350 W,
Total Power Usable
(in watts) System
Power (in
PSU (W) +
0
watts)
PSU (W)
1
350 350
700 665
Backup Base
Power (in Power (in
watts) watts)
0 150
0 150
(Continued)
Available Ports
PoE Power Enabled for
(in watts) PoE+
200 6
515 17
96