Dc Power Supply Configurations; Dc Power Supply Leds; Table 20: Power Supply Redundancy And Power Distribution; Table 21: Dc Power Supply Leds - Juniper SRX 5600 Hardware Manual

DC Power Supply Configurations

In the DC power configuration, the device contains either two or four DC power
supplies (see Figure 19 on page 30) located at the rear of the chassis in slots
through
four power supplies.
Four power supplies provide full redundancy. If a DC power supply in a redundant
configuration is removed or fails, its redundant power supply takes over without
interruption. The DC power supply in
supply in slot
DC power supply in slot
be installed in slots

Table 20: Power Supply Redundancy and Power Distribution

DC Power Supply Slot Redundant Power
Supply
PEM0 PEM1
PEM1 PEM0
PEM2 PEM3
PEM3 PEM2

DC Power Supply LEDs

Each DC power supply faceplate contains three LEDs that indicate the status of the
power supply (see Table 21 on page 31). The power supply status is also reflected
in two LEDs on the craft interface (see Table 15 on page 25). In addition, a power
supply failure triggers the red alarm LED on the craft interface.
NOTE: An SCB must be present for the

Table 21: DC Power Supply LEDs

Label Color
Green
PWR OK
Amber
(left to right). You can upgrade your DC power system from two to
PEM3
, and the DC power supply in
PEM0
PEM1
and
PEM0
Power Supply Provides Power to the Following Components
Fan tray, IOC or SPC slots
Fan tray, IOC or SPC slots
Fan tray and IOC or SPC slots
Fan tray and IOC or SPC slots
State Description
Off
Power supply is not functioning normally. Check the
information.
On Power supply is functioning normally.
On The main output voltage is out of range (lower limit: 37.5 V to 39.5 V; upper limit:
72.5 V to 76 V).
PEM2 serves as redundant to the DC power
PEM3
. If only two DC power supplies are installed, they must
or in slots and
PEM1 PEM2
0 and 1 , and SCB slots
and , and SCB slots
0 1
through
2 5
2 through 5
LED to go on.
PWR OK
Chapter 2: Hardware Components
PEM0
serves as redundant to the
.
PEM3
0 and 1
and
0 1
INPUT OK LED for more
31
Power Supplies