Srx5400 Services Gateway Power System Overview - Juniper SRX5400 Hardware Manual

DC Power Cable Lug Specifications for the SRX5400 Services Gateway | 54
DC Power Circuit Breaker Requirements for the SRX5400 Services Gateway | 55
DC Power Source Cabling for the SRX5400 Services Gateway | 55
SRX5400 Services Gateway Chassis Grounding Point Specifications | 56
SRX5400 Services Gateway Grounding-Cable Specification | 57
SRX5400 Services Gateway Grounding-Cable Lug Specification | 58

SRX5400 Services Gateway Power System Overview

The services gateway uses either AC or DC power supplies.
NOTE: The SRX5400 Services Gateway and SRX5600 Services Gateway use the same power
supply model.
The services gateway is configurable with two or three AC power supplies by default (optionally, a fourth
power supply can be added) or two DC power supplies. The AC power supplies are located horizontally
at the rear of the chassis in slots PEM0 through PEM3 (left to right) and the DC power supplies are located
in slots PEM0 and PEM2. The power supplies connect to the midplane, which distributes the different
output voltages produced by the power supplies to the services gateway components, depending on their
voltage requirements. Each power supply is cooled by its own internal cooling system.
CAUTION:
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.
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.
Table 13 on page 45 summarizes the available power supply types, their output capacities, and their
redundancy and power distribution schemes. For detailed power supply specifications, see
The services gateway cannot be powered from AC and DC power supplies
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