The DC power supplies are fully redundant. The DC power supplies in slots P/S 0 and
P/S 1 can provide full power to the router. Likewise, the DC power supplies in slots P/S 2
and P/S 3 can also provide full power. The DC power supplies in slots P/S 2 and P/S 3
jointly serve as the backup to the DC power supplies in slots P/S 0 and P/S 1. Power
supplies must be present in slots P/S 0 and P/S 1 for the router to operate.
Figure 301: M10i Router Redundant Power Supplies
NOTE: AC and DC power supplies are required in slots P/S 0 and P/S 1 for
the router to operate.
The DC power supplies in slots P/S 0 and P/S 1 must be powered by dedicated
power feeds derived from feed A, and the DC power supplies in slots P/S 2
and P/S 3 must be powered by dedicated power feeds derived from feed B.
This configuration provides the commonly deployed A/B feed redundancy
for the system.
Related
Documentation
Checklist for Monitoring Redundant Power Supplies on page 607•
M20 Router Redundant Power Supplies
Two load-sharing, isolated power supplies are located at the bottom rear of the M20
router chassis.The router uses either AC or DC power. Figure 302 on page 612 shows the
M20 router power supplies and where they are installed in the chassis.
When the power supplies are installed and operational, they automatically share the
electrical load. If a power supply stops functioning for any reason, the remaining power
supplies instantly begin providing all the power the router needs for normal functioning,
and can provide full power indefinitely.
611Copyright © 2012, Juniper Networks, Inc.
Chapter 30: Monitoring Redundant Power Supplies
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