Srx5400 Services Gateway Component Redundancy - Juniper SRX5400 Hardware Manual

Table 3: Field-Replaceable Units (continued)
Field-Replaceable Units (FRUs)
Routing Engine
SCBs
SPCs
MPCs
MICs

SRX5400 Services Gateway Component Redundancy

The following major hardware components are redundant:
Power supplies—The services gateway is configurable with two or three AC power supplies at the rear
of the chassis in slots PEM0 through PEM3 (left to right)or two DC power supplies in slots PEM0 and
PEM2.
In the low-line (110VAC input) or the high-line (220VAC input) configurations, two power supplies
are required to support the services gateway electrical requirements. By default, the AC powered
services gateways are configured with three AC (2+1) power supplies, you can add a fourth power
supply for fault tolerance. The fourth power supply is used when one of the power supplies in the 2+1
configuration fails.
In the DC powered services gateways two DC (1+1) power supplies are required to support the services
gateway electrical requirements. The minimum power supplies requirement is one and the second
power supply provides redundancy. If one power supply fails the second power supply instantly assume
the entire electrical load without interruption. Two power supplies provide the maximum configuration
with full power for as long as the device is operational.
Redundant power supplies are hot-removable and hot-insertable. When you remove a power supply
from a services gateway that uses a nonredundant power supply configuration, the services gateway
might shut down depending on your configuration.
Cooling system—The cooling system has redundant components, which are controlled by the host
subsystem. If one of the fans fails, the host subsystem increases the speed of the remaining fans to
provide sufficient cooling for the services gateway indefinitely.
Action
Power off the services gateway to install, remove, or replace any of
these FRUs.
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