The Next Step - Juniper E SERIES BROADBAND SERVICES ROUTERS 11.3.X - E120 AND E320 HARDWARE GUIDE REV 9-29-2010 Hardware Manual

The Next Step

Copyright © 2010, Juniper Networks, Inc.
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.
NOTE: Loosen the top and bottom thumbscrews (using a No. 2 Phillips
screwdriver, if necessary)
Remove the nuts and locking washers from the posts for the power input (A or B)
3.
using a small insulated adjustable wrench.
Place one negative (neutral) cable lead on the post labeled –48 VDC.
4.
Replace the locking washers and nuts, and tighten the nuts to secure the connection.
5.
Place the other cable lead on the post labeled RTN.
6.
Replace the locking washer and nut, and firmly tighten the nut to secure the connection.
7.
Attach the opposite end of Power A's wire leads to the appropriate leads on your
8.
power source.
NOTE: To provide redundancy, do not use the same power source for
Power A and Power B leads.
Place the clear plastic guard over the terminal posts, and secure it in place by tightening
9.
the four screws.
Repeat Steps 1–9 for each power input module in your configuration.
10.
See "Powering Up the Router" on page 55.
Chapter 5: Cabling the Router
53