Mx2020 Dc Power Distribution Description - Juniper MX2020 Hardware Manual

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MX2020 DC Power Distribution Description

Copyright © 2015, Juniper Networks, Inc.
Table 66: FRU DC Power Requirements (continued)
Component
DS3/E3 MIC
Channelized OC3/STM1
(Multi-Rate) Circuit
Emulation MIC with SFP
MX2020 Power Subsystem Description on page 83
Connecting Power to a DC-Powered MX2020 Router with Power Distribution Modules
on page 262
MX2020 DC Power Subsystem Electrical Specifications on page 179
MX2020 DC Power Distribution Description on page 177
Most sites distribute DC power through a main conduit that leads to frame-mounting DC
power distribution panels, one of which might be located at a location near the rack that
houses the router. A pair of cables (one input and one return) connects each set of PDM
input terminal studs to the power distribution panel.
The PSMs can be connected to two separate feeds from different sources that are used
for feed redundancy. There are up to four PDMs located in slots
PDM2/Input0 , PDM1/Input1
feeds. Each feed (feed or feed
A
from the other source to the second PDM of the DC power system. This configuration
balances power draw for the system using the commonly deployed A/B feed redundancy.
Each subsystem provides N+1 PSM redundancy along with N+N feed redundancy. If both
DC feeds are available, operating power draws from the feed with higher voltage.
NOTE: Depending on the voltage of the DC feeds, power can be drawn from
both feeds. The feed with higher voltage provides more power. If the difference
between the voltages is sufficient, then the higher voltage feed provides all
the power. When the voltages are exactly the same, equal power is drawn
from both feeds.
These feeds are set by the input mode DIP switch located on the DC PSM (see
DC Power Supply Module Description" on page
single DC PSM and is capable of delivering 2500 W of power if 80 A feeds are connected.
Chapter 14: DC Power Requirements, Specifications, and Guidelines
Model Number
MIC-3D-8DS3-E3
MIC-3D-8CHDS3-E3-B
MIC-3D-4COC3-1COC12-CE
, and PDM3/Input1 that are each capable of carrying nine
) is connected from one source to one PDM and feeds
B
96). Each set of power cables powers a
Maximum Power
Requirement
36 W at 55° C
35 W at 40° C
34 W at 25° C
33.96 W
,
PDM0/Input0
"MX2020
177