Table 17: Srx5800 Services Gateway Power Distribution - Juniper SRX5800 Hardware Manual

SRX5800 Services Gateway Hardware Guide
88
NOTE: The services gateway must be running Junos OS Release 10.4 or later
in order to use high-capacity AC power supplies. The services gateway must
be running Junos OS Release 12.1X44-D10 or later in order to use high-capacity
DC power supplies.
All power supplies are hot-removable and hot-insertable. Each power supply is cooled
by its own internal cooling system.
NOTE: Devices configured from the factory with DC power supplies are
shipped with a blank panel installed over the power distribution modules.
Devices configured with AC power supplies have no blank panel.
CAUTION: The services gateway cannot be powered from AC and DC power
supplies simultaneously. The first type of power supply detected by the
services gateway when initially powered on determines the type of power
supply allowed by the services gateway. All installed power supplies of the
other type are disabled by the services gateway. If you install a power supply
of the other type while the services gateway is operating, the services gateway
disables the power supply and generates an alarm.
When the services gateway is powered by standard-capacity AC power supplies, the
services gateway contains either three or four AC power supplies, located at the rear of
the chassis in slots through
PEM0
to all components in the services gateway. When three power supplies are present, they
share power almost equally within a fully populated system. Four power supplies provide
full power redundancy. If one power supply fails or is removed, the remaining power
supplies instantly assume the entire electrical load without interruption. Three power
supplies provide the maximum configuration with full power for as long as the services
gateway is operational.
When the services gateway is powered by either standard- or high-capacity DC power
supplies, or by high-capacity AC power supplies, power distribution within the chassis is
divided into zones, as described in
Table 17: SRX5800 Services Gateway Power Distribution (DC or
High-Capacity AC Power Supplies)
Zone Power Supplies
Zone 0 PEM0
PEM2
Zone 1 PEM1
PEM3
(left to right). Each power supply provides power
PEM3
Table 17 on page 88.
Provide Power To:
Lower fan tray
IOC or SPC slots 6 through 11
SCB slots 1 and 2
Upper fan tray
IOC or SPC slots 0 through 5
SCB slot 0
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