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.
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 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 Routing Engine boots as the power supply completes its startup sequence. If the Routing Engine finishes booting and you need to power off the system again, see Powering Off the M120 Router. 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 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.