Power Subsystem; Mx2020 Power Subsystem Description; Chapter 9 Power Subsystem - Juniper MX2020 Hardware Manual

CHAPTER 9

Power Subsystem

MX2020 Power Subsystem Description

Copyright © 2015, Juniper Networks, Inc.
MX2020 Power Subsystem Description on page 83
MX2020 Power Midplane Description on page 85
MX2020 Three-Phase Delta AC Power Distribution Module Description on page 86
MX2020 Three-Phase Wye AC Power Distribution Module Description on page 88
MX2010 Seven-Feed Single Phase AC Power Distribution Module Description on page 90
MX2010 DC Power Distribution Module Description on page 90
MX2020 Three-Phase Delta and Wye AC Power Distribution Module LEDs on page 91
MX2020 Nine-Feed Single Phase AC Power Distribution Module Description on page 92
MX2020 AC Power Supply Module LEDs on page 93
MX2020 DC Power Distribution Module Description on page 94
MX2020 DC Power Distribution Module LEDs on page 95
MX2020 DC Power Supply Module Description on page 96
MX2020 DC Power Supply Module LEDs on page 98
The MX2020 router uses AC or DC power distribution modules (PDMs) and AC or DC
power supply modules (PSMs). The MX2020 router is configurable with up to four AC
or DC PDMs (two per subsystem), and up to eighteen AC or DC PSMs. The PSMs connect
to the top and bottom power backplanes, which distribute the output voltages produced
by the PSMs to the router components.
DC power subsystem—The MX2020 DC power system is made up of two subsystems.
Each subsystem provides power to ten line card slots, one local fan tray and critical
FRUs. These critical FRUs consist of two CB-REs, eight SFBs located in the center of
the chassis, and two fan trays (one for each zone). Specifically, each power subsystem
has enough power delivery capacity to power ten line card slots, three fan trays, two
CB-REs, and eight SFBs. There are nine DC power supply modules (PSMs), and two
DC power distribution modules (PDMs) in each subsystem. This means, if one power
subsystem stops functioning for any reason, only the MPCs will stop functioning, but
the router will continue functioning.
DC PDMs— In the DC configuration, each subsystem provides N+1 power supply module
redundancy along with N+N feed redundancy. The power feeds from different sources
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