Mx204 Power System Description - Juniper MX204 Hardware Manual

AC Power Circuit Breaker Requirements for the MX204 Router | 39
AC Power Cord Specifications for MX204 Routers | 40

MX204 Power System Description

IN THIS SECTION
AC Power Supply Description | 34
DC Power Supply Description | 34
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 0 and 1.
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.
Figure 9 on page 34 and Figure 10 on page 35
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