Juniper MX2020 Hardware Guide

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AC power requirements—Table 6 on page 18 shows the MX2020 current requirements for the three-phase
delta, three-phase wye, and single-phase power feeds.
Table 6: AC PDM Current Requirements
Current per Single
Phase PDM
Current Wye per
Three-Phase PDM
Current Delta per
Three-Phase
PDMInput Feed
Three–Phase
Voltage
–50 A1200 V
(minimum–nominal)
(line-to-line) for
delta (per phase)
–25 A2
30 A–1200 V
(minimum–nominal)
(line-to-neutral) for
wye (per phase)
15 A–2
14 A––1200 V
(minimum–nominal)
NOTE: This is the minimum required to provide 2.5KW per PSM. Based on facilities guidelines,
you should over-provision the MX2020 router. The two numbers listed in the three-phase
delta and three-phase wye current columns reflect the distribution of phases from the feed
to the PSM. For example, from one feed, each phase goes to two PSMs, and from the other
feed, each phase goes to only one PSM.
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Cooling system—The cooling system in a fully-configured MX2020 router has a total of four fan trays,
which are controlled by the host subsystem. If one of the fans fails, the host subsystem increases the
speed of the remaining fans to provide sufficient cooling for the router. See “MX2020 Cooling System
Description” on page 45).The fan trays are powered by two power subsystems that are divided into
zones. The fan trays draw power from each zone depending upon whether you have a base DC power
subsystem (MX2020-BASE-DC) or an optimized DC power subsystem (MX2020-PREMIUM2-DC). In
the base DC power subsystem, two of the four fan trays draw power from both zones. In the optimized
DC power subsystem, two of the fan trays draw power from only one zone. See “Determining DC Power
Requirements for Your MX2020 Router” on page 209 for more information about MX 2020 power
distribution.
RELATED DOCUMENTATION
18

Juniper MX2020 Specifications

General

Brand	Juniper
Model	MX2020
Category	Network Router
Language	English