Mx2020 Component Redundancy; Figure 1: Power Distribution From Each Power Subsystem To The Frus - Juniper MX2020 Hardware Manual

MX2020 3D Universal Edge Router Hardware Guide
Related
Documentation

MX2020 Component Redundancy

6
MX Series Router Interface Names
A fully configured router is designed so that no single point of failure can cause the entire
system to fail. Only a fully configured router provides complete redundancy. All other
configurations provide partial redundancy. The following major hardware components
are redundant:
Host subsystem—The host subsystem consists of a combined Control Board and
Routing Engine (CB-RE) functioning together. The router can have one or two host
subsystems. If two host subsystems are installed, one functions as the master and the
other functions as the backup. If the master host subsystem (or either of its
components) fails, the backup can take over as the master.
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, (see

Figure 1: Power Distribution from Each Power Subsystem to the FRUs

Available power Power
zone 1
20 KW
Available power Power
20 KW zone 0
DC power feed redundancy—The MX2020 router subsystem is feed redundant. Each
PSM can be connected to two separate feeds from different sources that are used to
provide feed redundancy. There are two PDMs per power subsystem that carry nine
feeds each. Users should connect feeds from one power source to one PDM and feeds
from the other power source to the second PDM of the power subsystem, (see
2 on page 7).
Figure 1 on page 6).
LC 10-19
Available power: 14.5 KW
fan tray 3
SFB 0-7, CB0,
Available power: 5.5 KW from zone 1
CB1, fan tray 0,
Available power: 5.5 KW from zone 0
fan tray 2
LC 0-9
Available power: 14.5 KW
fan tray 1
Copyright © 2013, Juniper Networks, Inc.
Figure