position and observe the output status LED on the power supply faceplate. If the
power supply is correctly installed and functioning properly, the status LED on the
power supply faceplate blinks, then lights steadily approximately one minute after
you switch the power supply on.
NOTE: After powering off a power supply, wait at least 60 seconds before
turning it back on. After powering on a power supply, wait at least 60
seconds before turning it off.
If the system is completely powered off when you power on the power
supply, the RoutingEngine boots as the power supplycompletes its startup
sequence. If the Routing Engine finishes booting and you need to power
off the system again, see “Powering Off the M120 Router” on page 171.
After a powersupply is powered on, it can take up to 60 seconds for status
indicators—such asthe status LEDs on the powersupplyand the command
display output—to indicate that the power supply is functioning normally.
Ignore error indicators that appear during the first 60 seconds.
6. Repeat Step 5 for the second power supply.
NOTE: If any of the output status LEDs does not light steadily, repeat the
installation and cabling procedures.
7. On the external management device connected to the Routing Engine, monitor the
startup process to verify that the system has booted properly.
Related
Documentation
M120 AC Power Supply Description on page 72•
• Connecting Power to an AC-Powered M120 Router on page 167
• Connecting Power to a DC-Powered M120 Router on page 169
• General Electrical Safety Warnings for Juniper Networks Devices on page 339
Powering Off the M120 Router
To power off the router:
1. On the external management device connected to the Routing Engine, issue the
requestsystem haltboth-routing-engines operational mode command. The command
shuts down the Routing Engines cleanly, so their state information is preserved. (If
the router contains only one Routing Engine, issue the request system halt command.)
user@host> request system halt both-routing-engines
171Copyright © 2018, Juniper Networks, Inc.
Chapter 21: Providing Power to the M120
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