Juniper QFX3500, Техническая документация

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Table 53: Airflow Direction in AC Power Supply Models for EX4300 Switches
Direction of Airflow
Label on Power
Supply Model
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.
AIR OUT (AFO) JPSU-350-AC-AFO-A
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 IN (AFI) JPSU-350-AC-AFI-A
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.
AIR OUT (AFO) JPSU-715-AC-AFO-A
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.
AIR OUT (AFO) JPSU-1100-AC-AFO-A
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.
AIR OUT (AFO) JPSU-1400W-AC-AFO
N+0 Redundancy Configuration of AC Power Supplies
In an N+0 redundancy configuration, lower priority PoE ports may be impacted if a power supply fails.
Table 54 on page 174 lists the N+0 power calculation for 24-port EX4300 switches that use 350 W, 715 W,
and 1100 W power supplies.
Table 54: N+0 AC Power Calculations for 24-Port EX4300 Switches
Ports
Enabled
for
PoE+
Available
PoE
Power (in
watts)
Base
Power (in
watts)
Backup
Power
(in
watts)
Usable
System
Power (in
watts)
Total
Power (in
watts)
PSU
0
(W) +
PSU
1
(W)
Power Supply Rating
PSU
1
PSU
0
6 200 150 0 350 350 – 350 W AC
17 515 150 0 665 700 350 W AC 350 W AC
174