Task 3: Connect the Power Cables

To connect power cables to the router, follow these steps. See Figure 27 as needed.

Note: Juniper Networks has qualified an AC power supply unit for use with the router. Contact your account representative for more information.

Warning: Before you begin this procedure, be sure the power source is turned off, the router is turned off, and proper grounding wires are attached.

1. Be sure you have completed Task 1: Turn Off All Router Power and Task 2: Connect the Grounding Cables.
2. If applicable, loosen the screws from the clear power input module cover and remove it.

   Warning: The wiring color code of the power cables depends on the color coding of the DC power source installed at your site. Color code standards for DC wiring do not exist. To ensure that the correct polarity is connected to the router power units, confirm the connection of the power cables to the + (positive) and – (negative) leads at the power source.

3. Remove the nuts and locking washers from the posts for the power input (A or B) using a small insulated adjustable wrench.
4. Place one negative (neutral) cable lead on the post labeled –48 VDC.
5. Replace the locking washers and nuts, and tighten the nuts to secure the connection.
6. Place the other cable lead on the post labeled RTN.
7. Replace the locking washer and nut, and firmly tighten the nut to secure the connection.
8. Attach the opposite end of Power A's wire leads to the appropriate leads on your power source.

   Note: To provide redundancy, do not use the same power source for Power A and Power B leads.

9. Place the clear plastic guard over the terminal posts, and secure it in place by tightening the four screws.
10. Repeat Steps 1–9 for each power input module in your configuration.

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