Juniper MX480, Hardware Manual

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11.
Verify that the power cabling is correct, that the cables are not touching or blocking
access to router components, and that they do not drape where people could trip on
them.
12.
Switch on the dedicated customer site circuit breakers. Follow your site's procedures
for safety and ESD.
Verify that the
INPUT OK
LED on the power supply is lit green.
13.
On each of the DC power supplies, switch the DC circuit breaker to the center position
before moving it to the on (
— ) position.
NOTE: The circuit breaker may bounce back to the off (
O
) position if you
move the breaker too quickly.
Observe the status LEDs on the power supply faceplate. If the power supply is correctly
installed and functioning normally, the
PWR OK , BRKR ON , and INPUT OK LEDs light
green steadily.
NOTE: If more than one power supply is being installed, turn on all power
supplies at the same time.
NOTE: An SCB must be present for the
PWR OK
LED to go on.
Figure 139: Installing a DC Power Supply in the Router
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MX480 Universal Routing Platform Hardware Guide