Juniper MX480, Руководство по оборудованию

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Code and customer site internal standards to maintain proper level of protection for the
current specified above or each DC power supply rated for at least 125% of the continuous
current that the system draws at –48 VDC.
DC Power Source Cabling for the MX480 Router
Figure 16 on page 57 shows a typical DC source cabling arrangement.
Figure 16: Typical DC Source Cabling to the Router
The DC power supplies in
PEM0
and
PEM1
must be powered by dedicated power feeds
derived from feed
A
, and the DC power supplies in
PEM2
and
PEM3
must be powered by
dedicated power feeds derived from feed
B
. This configuration provides the commonly
deployed
A/B
feed redundancy for the system.
CAUTION: You must ensure that power connections maintain the proper
polarity. The power source cables might be labeled
(+)
and
(–)
to indicate
their polarity. There is no standard color coding for DC power cables. The
color coding used by the external DC power source at your site determines
the color coding for the leads on the power cables that attach to the terminal
studs on each power supply.
WARNING: For field-wiring connections, use copper conductors only.
CAUTION: Power cords and cables must not block access to device
components or drape where people could trip on them.
See Also In Case of an Electrical Accident
•
•
Connecting Power to a DC-Powered MX480 Router with Normal Capacity Power
Supplies on page 207
•
Replacing an MX480 DC Power Supply Cable on page 327
57 Copyright © 2019, Juniper Networks, Inc.
Chapter 1: Overview