Figure 61: Power Distribution From Dc And High-Capacity Ac Power Supplies In The Srx5800 Services Gateway Chassis - Juniper SRX5800 Hardware Manual

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Figure 61 on page 89 shows the distribution of power from the power supplies to the
chassis components in an SRX5800 Services Gateway chassis powered by DC power
supplies or high-capacity AC power supplies.
Figure 61: Power Distribution from DC and High-Capacity AC Power
Supplies in the SRX5800 Services Gateway Chassis
Zone 1 Zone 0
NOTE: The craft interface draws its power from the SCBs installed in the
SCB slots 0, 1, and 2 at the center of the card cage. In the standard
configuration, with SCBs in slots 0 and 1, the craft interface is powered on
even when one of the two zones loses power. But if the chassis only has one
SCB installed, the craft interface draws all of its power from that card, and
consequently is powered off if the zone in which that SCB is installed loses
power.
You can install either two or four DC power supplies or high-capacity AC power supplies.
Two power supplies are required to power the two zones, while four power supplies
provide full redundancy for both zones. The power supplies in slots
a redundant pair, as do the power supplies in slots
supplies are installed for a zone, they share the load. If a power supply fails, its redundant
power supply assumes the full load of that zone without interruption.
If you do install only two power supplies, they must be installed so that one is in an
odd-numbered slot and the other is in an even-numbered slot. For example, you can
install one high-capacity AC power supply in each of the slots
Calculating Power Requirements for the SRX5800 Services Gateway on page 107
SRX5800 Services Gateway Standard-Capacity AC Power Supply on page 93
SRX5800 Services Gateway Standard-Capacity DC Power Supply on page 98
SRX5800 Services Gateway High-Capacity AC Power Supply on page 90
Chapter 6: Power System Description
PEM0 PEM1 PEM2 PEM3
and
PEM0
and . When two power
PEM1 PEM3
and
PEM0 PEM1
form
PEM2
.
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