Powering On a DC-Powered MX960 Router

1. Verify that an external management device is connected to one of the Routing Engine ports (AUX, CONSOLE, or ETHERNET).
2. Turn on the power to the external management device.
3. Verify that the power supplies 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. Follow your site’s procedures.
6. Check that the INPUT OK LED 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. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to one of the ESD points on the chassis.
9. 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.

10. Verify that the BREAKER ON LED is lit green steadily.
11. Verify that the PWR OK LED is lit green steadily, indicating the power supply is correctly installed and functioning normally.

    Note: After a power supply is powered on, it can take up to 60 seconds for status indicators—such as the status LEDs on the power supply and the show chassis command display—to indicate that the power supply is functioning normally. Ignore error indicators that appear during the first 60 seconds.

    If any of the status LEDs indicates that the power supply is not functioning normally, repeat the installation and cabling procedures.

12. On the external management device connected to the Routing Engine, monitor the startup process to verify that the system has booted properly.

    Note: If the system is completely powered off when you power on the power supply, the Routing Engine boots as the power supply completes its startup sequence. Normally, the router boots from the Junos OS on the CompactFlash card. After powering on a power supply, wait at least 60 seconds before turning it off. To power off the system after the Routing Engine finishes booting, see Powering Off the MX960 Router.