Juniper EX4400 - Page 119

Table 64: Airow Direcon in DC Power Supply Models for EX4400 Switches
Model Direcon of Airow
JPSU-550-C-DC-AFO Front-to-back—that is, cold air enters the chassis through the vents on the front
panel of the chassis and hot air exhausts through the vents on the rear panel of
the chassis, indicated by the AIR OUT label and the Juniper Gold handle.
JPSU-550-C-DC-AFI Back-to-front—that is, cold air enters the chassis through the vents on the rear
panel of the chassis and hot air exhausts through the vents on the front panel of
the chassis, indicated by the AIR IN label and the Juniper Azure Blue handle.
Power Supply LEDs in EX4400 Switches
The power supplies for EX4400 switches have one LED that indicates its state.
• Figure 79 on page 111 shows the LED on the 550-W AC power supply for EX4400 switches.
• Figure 80 on page 112 shows the LED on the 1050-W AC power supply for EX4400 switches.
• Figure 81 on page 112 shows the LED on the 1600-W AC power supply for EX4400 switches.
• Figure 82 on page 112 shows the LED on the 550-W DC power supply for EX4400 switches.
Figure 79: LED on the 550-W AC Power Supply for EX4400 Switches
1—
Power supply LED
111