Determining Dc Power Requirements For Your Mx2020 Router; Mx 2020 Dc Power Subsystem Components; Understanding Power Zones In The Mx2020 Dc Power Subsystem - Juniper MX2020 Hardware Manual

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Determining DC Power Requirements for Your MX2020 Router

This topic describes the MX2020 DC power subsystem, power zones, and DC power usage to help you
determine which Power Supply Modules (PSMs) are suitable for your router configuration.
We recommend that you provision power according to the maximum input current listed in the power
subsystem electrical specifications (see
on page 205).

MX 2020 DC Power Subsystem Components

The MX2020 DC power system is comprised of two subsystems. Each subsystem provides power to:
10 line-card slots
Nine DC Power Supply Modules (PSMs)
Two DC Power Distribution Modules (PDMs)
20 Modular Port Concentrators (MPCs) (10 MPCs per zone)
Two fan trays
Eight Switch Fabric Boards (SFBs)
Two Control Board and Routing Engines (CB-REs)

Understanding Power Zones in the MX2020 DC Power Subsystem

The MX2020 DC power subsystem has two power zones: zone 0 and zone 1. Some FRUs draw power
only from zone 0, some FRUs draw power only from zone 1, and some FRUs draw power from both zone
0 and zone 1. When calculating power requirements, ensure there is adequate power for each zone. Each
zone needs to provide 70% of the total power required by shared FRUs. This means 140% of the power
required by the FRUs is available in the two power zones combined.
There are two types of DC power subsystems available for the MX2020: a "base" DC power subsystem
(MX2020-BASE-DC) and an "optimized" or premium DC power subsystem (MX2020-PREMIUM2-DC).
"MX2000 Router DC Power Subsystem Electrical Specifications"
209