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Connecting Power on an DC-Powered M10i Router


On a DC-powered router, the DC power cables from the external DC power sources connect to field-wiring terminals on each power supply.

Connect DC power to the router by inserting power cables into the field-wiring terminals on the faceplate of each power supply. DC power cables are not supplied with the router. For information about the required cable type, see M10i DC Power Cable and Lug 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 DC 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 (see Figure 1):

  1. Verify that there is no power flowing from either external power source, so that the voltage across the leads of the DC 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. Verify that a licensed electrician has attached a listed DC power cable lug to each power source cable.
  4. Loop the DC power cables through the hook located on the faceplate to the right of the field-wiring terminals.
  5. Depending on the type of DC power cable lugs used, loosen or remove the screws on the field-wiring terminals.
  6. Insert the DC power cable lugs into the appropriate field-wiring terminals. Using a number 1 Phillips screwdriver, turn the screw on each field-wiring terminal clockwise to secure the DC power cable lug. Apply between 8 lb-in. (.9 Nm) and 9 lb-in. (1.02 Nm) of torque to each screw.
    1. Insert the positive (+) source cable into the return terminal, which is labeled RTN.
    2. Insert the negative (–) source cable into the input terminal, which is labeled –48V.

    The DC power supplies in slots P/S 0 and P/S 1 must be powered by dedicated power feeds derived from feed A, and the DC power supplies in slots P/S 2 and P/S 3 must be powered by dedicated power feeds derived from feed B. This configuration provides the commonly deployed A/B feed redundancy for the system.

  7. 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.
Figure 1: Connecting DC Power Cables to a DC Power Supply
Connecting DC Power
Cables to a DC Power Supply