Figure 59: Connecting DC Power to the M120 Router
Related
Documentation
DC Power Electrical Safety Guidelines for the M120 Router on page 347•
• Electrical Specifications for the M120 DC Power Supply on page 100
• M120 DC Power Supply Description on page 72
• M120 Power Supply LEDs on page 73
Powering On the M120 Router
To power on the router:
1. Verify that the power supplies are fully inserted in the chassis and that the captive
screws on their faceplates are tightened.
2. For each power supply on an AC-powered router, verify that the source power cord is
securely inserted into the appliance inlet. For each power supply on a DC-powered
router, verify that the source power cables are connected to the appropriate terminal:
the positive (+) source cable to the return terminal (labeled RETURN) and the negative
(–) source cable to the input terminal (labeled –48V).
3. Verify that an external management device is connected to one of the Routing Engine
ports on the craft interface (AUX, CONSOLE, or ETHERNET). For more information
about connecting management devices, see “Connecting the M120 Router to
Management and Alarm Devices” on page 153.
4. Turn on the power to the external management device.
5. For the DC power supply, switch the circuit breaker on one of the power supplies to
the on position (|). For the AC power supply, move the power switch to the standby
Copyright © 2018, Juniper Networks, Inc.170
M120 Multiservice Edge Router Hardware Guide
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