Ac Power Supply Configurations; Mx240 Ac Power Supply Leds - Juniper MX240 Hardware Manual

See Also

MX240 AC Power Supply LEDs

Copyright © 2019, Juniper Networks, Inc.
grounding pin of the power supply cord. This separate protective earthing
terminal must be permanently connected to earth.

AC Power Supply Configurations

The MX240 high-capacity and normal-capacity power supplies each support either of
the following AC power configurations:
In the low-line (110 V) AC power configuration, the MX240 router contains either two
AC power supplies (nonredundant), located horizontally at the rear of the chassis in
slots and (left to right); or four AC power supplies (redundant), located in
PEM0 PEM1
slots through
PEM0 PEM3
supplies, and the third and fourth power supplies provide redundancy. Each AC power
supply provides power to all components in the router. When two power supplies are
present, they share power almost equally within a fully populated system. If one power
supply in a redundant configuration fails or is removed, the remaining power supplies
assume the entire electrical load without interruption. Two power supplies provide the
maximum configuration with full power for as long as the router is operational.
In the high-line (220 V) AC power configuration, the MX240 router contains one or two
AC power supplies, located horizontally at the rear of the chassis in slots
(left to right). The high-line configuration requires one power supply, with the
PEM2
second power supply providing redundancy. Each AC power supply provides power to
all components in the router. When two power supplies are present, they share power
almost equally within a fully populated system. If one power supply fails or is removed,
the remaining power supply assumes the entire electrical load without interruption.
One power supply can provide the maximum configuration with full power for as long
as the router is operational.
Connecting Power to an AC-Powered MX240 Router with Normal-Capacity Power
Supplies on page 197
MX240 Chassis Grounding Specifications on page 53
Each AC power supply faceplate contains three LEDs that indicate the status of the
power supply (see Table 13 on page
LEDs on the craft interface (see
page 36).In addition, a power supply failure triggers the red alarm LED on the craft
interface.
(left to right). The low-line configuration requires two power
44). The power supply status is also reflected in two
"MX240 Component LEDs on the Craft Interface" on
Chapter 1: Overview
PEM0 and
43