Powering On A Dc-Powered Mx204 Router - Juniper MX204 Hardware Manual

General Electrical Safety Guidelines and Warnings | 172
Prevention of Electrostatic Discharge Damage | 173

Powering On a DC-Powered MX204 Router

To power on a DC-powered router:
1. Verify that an external management device is connected to the CON port on the chassis.
2. Turn on power to the external management device.
3. Verify that the power supply modules are fully inserted in the chassis.
4. Verify that the source power cables are connected to the appropriate terminal: the positive (+) source
cable to the return terminal (labeled RTN) and the negative (–) source cable to the input terminal (labeled
–48V).
5. Switch on the dedicated customer-site circuit breakers to provide power to the DC power cables.
6. Check that the status LED on the power supply faceplate is lit steadily green to verify that power is
present.
7. If power is not present:
Verify that the fuse is installed correctly, and turn on the breaker at the battery distribution fuse
board or fuse bay.
Check the voltage with a meter at the terminals of the power supply for correct voltage level and
polarity.
8. Wrap and fasten one end of the ESD grounding strap around your bare wrist, and connect the other
end of the strap to the ESD point on the chassis.
9. Observe the status LED on each power supply faceplate. If a DC power supply is correctly installed
and functioning normally, the status LED lights green steadily.
If the status LED on the power supply is unlit, the power supply is not functioning normally. Repeat
the installation and cabling procedures.
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