Power System Components And Descriptions - Juniper MX204 Hardware Manual

CHAPTER 5
Power System Components and
Descriptions
MX204 Power System Description
Copyright © 2018, Juniper Networks, Inc.
MX204 Power System Description on page 21
MX204 Power Supply Module LEDs on page 23
The MX204 is powered using either AC or DC power. It supports two power supply modules
(PSMs) located at the rear of the chassis in slots
Figure 11 on page 23 show the MX204 PSMs. The AC or DC power supply modules directly
plug on to main board and are placed on the right side of the rear chassis. Each power
supply has a handle, an ejector lever, and status LEDs. The power supply modules connect
to the PSM board, which distributes the different output voltages produced by the power
supply modules to the router components, depending on their voltage requirements.
When both the power supply modules are present, they share power almost equally
within a fully populated system. If the first power supply in a redundant configuration
fails or is removed, the second power supply assumes the entire electrical load without
interruption. A single power supply provides the maximum configuration with full power
for as long as the router is operational. A second power supply can be installed for
redundancy. The chassis is designed to support 1+1 feed redundancy.
Redundant power supply is hot-removable and hot-insertable. If you remove a power
supply from a router that uses only one power supply, then the router shuts down.
CAUTION: Do not mix AC and DC power supply modules in the same chassis.
NOTE: Routers configured with only one power supply are shipped with a
blank panel installed over the power supply slot that is not populated.
The power supply modules are cooled by its own internal cooling system. A fan present
in the power supply module monitors and maintains the temperature inside.
AC Power Supply Description on page 22
DC Power Supply Description on page 22
and . Figure 10 on page 22
0 1
and
21