Juniper SRX5800 Hardware Manual page 178

The SRX5800 Services Gateway chassis with normal-capacity AC power supplies has one overall zone.
The SRX5800 Services Gateway Chassis with high-capacity AC power supplies or either standard- or
high-capacity DC power supplies is zoned. Zoning means that certain components are powered by specific
power supplies (see Table 41 on page 179
calculating power requirements, be sure that there is adequate power for each zone.
Three AC power supplies are mandatory for a SRX5800 Services Gateway chassis with normal-capacity
AC power supplies.
Table 41: SRX5800 Services Gateway Zoning
Zone Power Supply (PEM)
Zone 0 PEM 0 or 2
Zone 1 PEM 1 or 3
Figure 84: Power Distribution from DC and High-Capacity AC Power Supplies in the SRX5800 Services
Gateway Chassis
Zone 1 Zone 0
Sample configuration for SRX5800 Services Gateway chassis with SRX5K-SCB (SCB1) and SRX5K-RE-13-20
(RE1):
Four high-capacity AC power supplies (using two feeds for each power supply); two supplies are active,
two are redundant.
Two Switch Control Boards (SCBs) with one Routing Engine installed in SCB 0
and Figure 84 on page 179
Components Receiving Power
Lower fan tray
IOC/SPC slots 6 through 11
SCB slots 1 through 2
Upper fan tray
IOC/SPC slots 0 through 5
SCB slot 0
PEM0 PEM1 PEM2 PEM3
for information on zoning). When
179