Connect DC Power to the Router

Connect DC power to the router by inserting power cables from external DC power sources into the quick-connect terminals on the faceplate of each power supply. Power and grounding cables are not supplied with the router. For information about the required cable type, see DC Grounding, Connection, and Cable Specifications.

The router must be connected to at least two separate external DC power sources.

There is no standard color coding for DC power cables. The color coding used by the external DC power source at your site determines the color coding for the leads on the power cables that attach to the terminal studs on the power supply faceplate. You must ensure that power connections maintain the proper polarity. The power source cables might be labeled (+) and (–) to indicate their polarity.

To connect DC power to the router, follow this procedure (see Figure 39):

1. Verify that there is no power flowing from either external power source, so that the voltage across the leads of the power cables is 0 V. Ensure that there is no chance that the cable leads might become active during the procedure.
2. For each power supply, verify that the power switch on the power supply faceplate is in the OFF (O) position.
3. Connect the grounding cable to a proper earth ground for both external DC power sources, if it is not already.
4. Verify that a licensed electrician has attached the cable lug provided with the router to the grounding cable, and that the cable is attached to a grounding point on the chassis rear.
5. If necessary, strip a short section of the protective cladding from the end of each power cable so that the metal core can come in direct contact with the quick-connect terminal.
6. Thread the power cables through the hook located on the faceplate to the right of the quick-connect terminals.
7. Insert the exposed end of each power cable straight into the appropriate quick-connect terminal:
   • Insert the positive (+) source cable into the return terminal, which is labeled RTN.
   • Insert the negative (–) source cable into the input terminal, which is labeled –48V.
8. Using a 3-mm flat-blade screwdriver, turn the screw on each quick-connect terminal clockwise to tighten the terminal connector around the cable.
9. Verify that the DC source power cabling and the grounding cabling are correct, that they are not touching or blocking access to router components, and that they do not drape where people could trip on them.
10. Turn on the DC power source so that voltage flows to the router.
11. Turn on the power to a management device that is connected to the Routing Engine (through the craft interface port labeled AUX/MODEM,CONSOLE, or MGMT). For more information on connecting management devices, see Replace Connectors to Routing Engine Interface Ports.
12. Press the power switch on one power supply faceplate to the ON position and engage the safety interlock lever below the power switch. Verify that the blue OUTPUT OK LED eventually lights steadily.

    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 router is completely powered down 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 down the router again, first issue the CLI request system halt command. For more information, see Disconnect AC Power from the Router or Disconnect DC Power from the Router. After a power supply is powered on, it can take up to 60 seconds for status indicators—such as LEDs on the power supply and show chassis commands—to indicate that the power supply is functioning normally. Ignore error indicators that appear during the first 60 seconds.

13. Press the power switch for the second power supply to the ON ( | ) position and observe the LEDs on the second power supply faceplate. They should light as described in the previous step.

    If the LEDs are not lit in the appropriate pattern after 60 seconds, repeat the power supply and cable installation procedures described in Install a DC Power Supply and the previous steps in this section.

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

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