Juniper T640 Hardware Manual page 398

T640 Core Router Hardware Guide
364
the color coding for the leads on the power cables that attach to the
terminal studs on each power supply.
Secure the cable lugs to the terminal studs, first with a washer, then with a nut (see
7.
Figure 182 on page 365).
Attach the positive (+) DC source power cable lugs to the
a.
terminals.
Attach the negative (–) DC source power cable lugs to the
b.
Use a 7/16-in. (11 mm) nut driver or wrench to tighten the nut. Apply between 23 lb-in.
(2.6 Nm) and 25 lb-in. (2.8 Nm) of torque to each nut.
NOTE: For power supplies set to
router and TX Matrix router), connect two DC power cables, one for
RETURN and one for –48 V to
RETURN and one for
NOTE:
INPUT 0
in slot
PEM0
feed A, and INPUT 0
in slot must be powered by dedicated power feeds derived from feed
PEM1
B. This configuration provides the commonly deployed A/B feed
redundancy for the system.
Loosen the captive screw or screws on the cable restraint on the right edge of the
8.
power supply faceplate.
Route the DC power cables through the cable restraint.
9.
Tighten the cable restraint captive screw or screws to hold the power cables in place.
10.
Verify that the power cabling is correct, that the power cables are not touching or
11.
blocking access to other hardware components, and that they do not drape where
people could trip on them.
Replace the clear plastic cover over the terminal studs on the faceplate.
12.
2-INPUT
INPUT 0
to .
–48 V INPUT 1
and on the three-input 240-A DC power supply
INPUT 1
must be powered by dedicated power feeds derived from
and INPUT 1 on the three-input 240-A DC power supply
(return)
RETURN
–48V (input) terminals.
mode (required for the T640
and two DC power cables, one for
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