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ERX 8.0.x Hardware Guide
WARNING: Be sure the power source is turned off, the router is turned off, and
proper groundi
ng wires are attached before continuing with this procedure.
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 ex
ist. To ensure that the c orrect 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. Removethenutsandlockingwashersfromthepostsforthepowerinput(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 lo
cking washers and nuts, and tighten the nuts to secure the
connection.
6. Place the othe
r cable lead on the post labeled RTN.
7. Replace the locking washer and nut, and 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 so
urce.
NOTE: To provide redundancy, do not terminate Power A and Power B leads at the
same power so
urce.
9. Place the clear plastic gua rd over the terminal posts, and secure it in place by
tightening t
he four screws.
10. Repeat Steps 1–9 for each power input module in your configuration.
64 Cabling the Router for Power