Juniper Networks E-Series manual Negative leads at the power source

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CHAPTER 6

Cabling E-Series Routers

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 E-series router power units, confirm the connection of the power cables to the + (positive) and

– (negative) leads at the power source.

3Remove the nuts and locking washers from the posts for the power input (A or B) using a small insulated adjustable wrench.

4Place one negative (neutral) cable lead on the post labeled –48 VDC.

5Replace the locking washers and nuts, and tighten the nuts to secure the connection.

6Place the other cable lead on the post labeled RTN.

7Replace the locking washer and nut, and tighten the nut to secure the connection.

8Attach the opposite end of Power A’s wire leads to the appropriate leads on your power source.

Note: To provide redundancy, Power A and Power B leads should not terminate at the same power source.

9Place the clear plastic guard over the terminal posts, and secure it in place by tightening the four screws.

10Repeat steps 1–9 for each power input module in your configuration.

Power A	DC power	DC power
leads	input A	input B

-48VDC RTN O OFF ON POWER A O OFF -48VDC RTN ON POWER B

Ground	Power A	Power B
	switch	switch

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Figure 6-5ERX-310 router, rear view (DC model)